TSP Contribution Limits

The Thrift Savings Plan (TSP) is the federal government's defined contribution retirement plan — the equivalent of a 401(k) for federal civilian employees and uniformed military — covering approximately 7 million participants and holding over $900 billion in assets, making it the largest defined contribution plan in the world. Governed by 5 U.S.C. § 8432, the TSP allows participants to defer up to $24,500 in 2026 (same as the 401(k) limit), with an $8,000 catch-up for those 50 and over (and an enhanced $11,250 catch-up for ages 60–63 under SECURE 2.0). FERS employees receive a 5% government match — the most generous federal benefit most employees never fully capture: 1% automatic contribution regardless of employee contribution, then dollar-for-dollar on the next 3%, then 50 cents on the dollar for the next 2%. Military members under the Blended Retirement System (BRS) receive the same 5% match structure. Both traditional (pre-tax) and Roth TSP options are available. The TSP offers only a handful of index fund options — intentionally simple, with expense ratios near 0.048%, dramatically lower than most retail funds. Unlike many 401(k) plans, there is no default fund selection and no auto-escalation unless the agency opts into it.

Current Law (2026)

The Thrift Savings Plan (TSP) is the federal government's defined contribution retirement plan for civilian employees and military members under FERS, structured similarly to a 401(k).

Legal Authority

• 5 USC § 8432 — Contributions: employees may contribute up to 100% of basic pay starting fiscal year 2006; new hires auto-enrolled at 3%; start/stop/change contributions at any time with next-available-period processing
• 5 USC § 8432(c) — Agency contributions: automatic 1% of basic pay regardless of employee election; dollar-for-dollar match on first 3%, 50% match on next 2%; automatic 1% vests after 2-3 years, matching vests immediately
• 5 USC § 8437 — Thrift Savings Fund: Treasury fund holding all contributions and investment returns; no fiscal year limit on availability; can only be used for investments, payments, and administration
• 5 USC § 8438 — Investment options: statutory G Fund (government securities), F Fund (fixed income index), C Fund (S&P 500), S Fund (small/mid-cap index), I Fund (international index); Board may add mutual fund window; funds must replicate standard indexes
• 5 USC § 8440 — Tax treatment: TSP treated as tax-exempt trust under IRC § 401(a)/501(a); employee deferrals are elective contributions under IRC § 402(a)(8); Traditional (pre-tax) and Roth (post-tax under § 402A) options available
• 5 USC § 8433 — Withdrawal options: upon separation, choose annuity, lump-sum, periodic payments, or combination; in-service withdrawals at 59½+; TSP loans available during service
• 5 USC § 8440a-8440f — TSP for various employee groups (CSRS, judicial, congressional, Reserve components)
• 37 USC Section 211 — TSP for military members (Blended Retirement System)
• 10 U.S.C. § 12739 — Military retired pay computation: 2.5% × years of service × retired pay base; BRS military members receive both TSP matching and reduced pension (2.0% multiplier vs. legacy 2.5%)
• 10 U.S.C. § 12733 — Years of service computation for retired pay: total qualifying days ÷ 360; counts active duty, full-time Guard service, and reserve training days
• 26 U.S.C. § 401 — Qualified pension, profit-sharing, and stock bonus plans (IRC provision governing tax-qualified retirement plans; TSP contribution limits derive from § 401(a)(17) compensation cap and § 402(g) elective deferral limit; annual IRS adjustments for inflation)
• 26 U.S.C. § 457 — Deferred compensation plans of state and local governments and tax-exempt organizations (IRC provision governing governmental deferred compensation; TSP catch-up and contribution mechanics parallel § 457 plan rules for government employees)

How It Works

FERS civilian employees receive an agency match built in two layers. First, an automatic 1% contribution is deposited regardless of whether you contribute anything (5 U.S.C. § 8432(c)). Then TSP adds dollar-for-dollar matching on the first 3% you contribute, plus 50 cents on the dollar for the next 2%. Contribute 5% and you receive 5% in agency contributions — an effective 100% return on the first 3% and 50% on the next 2% before any investment growth. BRS military members (those who entered service after January 1, 2018) receive the identical matching structure. Agency contributions are always traditional (pre-tax) regardless of whether you designate your own deferrals as Roth.

TSP offers both traditional (pre-tax) and Roth (after-tax) employee contributions. The investment menu is intentionally narrow and low-cost: the G Fund (government securities with a guaranteed positive return unavailable in private markets), F Fund (bond index), C Fund (S&P 500), S Fund (small/mid-cap), I Fund (international), and L Funds (lifecycle target-date blends). Expense ratios run approximately 0.048% — roughly 10–50x cheaper than most retail IRA and 401(k) options. A brokerage mutual fund window adds access to thousands of outside funds but costs $95/year plus $28.75 per trade, making it useful only for specialized needs the core lineup doesn't cover.

Military members deployed in combat zones may contribute up to the $72,000 annual total limit from tax-exempt combat pay — contributions made with income that was already excluded from tax, then growing and distributed tax-free, producing a benefit similar to a Roth contribution without any income limit. TSP balances can be rolled into an IRA or new employer plan after separation from federal service; balances from other qualified plans can also be rolled into TSP, consolidating accounts at TSP's low expense ratios. In-service withdrawals before 59½ are restricted and generally subject to penalties; TSP loans (both general-purpose and residential) are available during active service with specific repayment requirements.

How It Affects You

State Variations

TSP is a federal plan. State tax treatment of TSP distributions follows the state's treatment of retirement income (some states partially or fully exempt federal pension/TSP income).

Implementing Regulations

• 5 CFR Part 1600 — Employee Contribution Elections, Investment Elections, and Automatic Enrollment (19 sections — the FRTIB regulations governing how federal employees start, change, and stop TSP contributions, and how the TSP automatic enrollment program operates):

  • § 1600.11–1600.12 — Types and mechanics of contribution elections: participants may elect (1) to make contributions, (2) to stop contributions, (3) to change the amount contributed, or (4) to change the composition (traditional vs. Roth); elections may be made at any time and are effective no later than the first full pay period after the election is submitted; there is no open-season restriction for TSP contribution elections (unlike some employer plans)
  • § 1600.19 — Agency automatic contributions: any agency employing a FERS or Blended Retirement System (BRS) member must make 1% Agency Automatic Contributions each pay period regardless of whether the employee contributes — even if the employee opts out; these 1% contributions vest after 3 years of federal civilian service (2 years for certain positions); additionally, agencies match employee contributions dollar-for-dollar on the first 3% and 50 cents per dollar on the next 2% (total agency match of 5% maximum)
  • § 1600.20 — Traditional vs. Roth contributions: participants may make traditional (pre-tax) contributions that reduce current taxable income, Roth (after-tax) contributions to a separate Roth balance, or both; the combined total of traditional and Roth contributions cannot exceed the annual IRS elective deferral limit ($23,500 in 2025, indexed); agency contributions are always traditional regardless of the employee's election and cannot be directed to Roth
  • § 1600.21–1600.22 — Election amounts and IRS limits: civilian employees may elect a percentage of basic pay or a specific dollar amount; contributions automatically stop once the IRS annual limit is reached; military members' contribution elections are separate from any civilian TSP account and must be made independently (§ 1600.18)
  • § 1600.23 — Catch-up contributions: participants aged 50 or older may make additional catch-up contributions above the standard limit ($7,500 additional in 2025, indexed); as of 2026, participants aged 60–63 may make a higher "super catch-up" under SECURE 2.0 Act provisions; catch-up contributions are made as traditional or Roth in the same proportion as regular contributions
  • § 1600.30–1600.32 — Rollover into TSP: participants may roll over eligible distributions from a previous employer's 401(k), 403(b), or governmental 457(b) plan, or from an IRA, into their TSP account; rollovers are treated as employee contributions; direct rollovers (trustee-to-trustee) and indirect rollovers (60-day window) are both permitted; Roth balances from other plans may be rolled into the TSP Roth balance
  • § 1600.34 — Automatic enrollment: all newly hired federal civilian employees are automatically enrolled in TSP at a 5% default contribution rate (effective 2020), with contributions going to the age-appropriate Lifecycle Fund unless redirected; this default was designed to capture the full 5% agency match automatically; employees who do not want to contribute must affirmatively opt out
  • § 1600.35 — Refunds for default enrollees: employees automatically enrolled under § 1600.34 who did not know they were enrolled may request a refund of default contributions within 90 days of the first contribution; approved refunds return the employee's contributions (but not agency contributions) without earnings; agency contributions attributable to the refunded period are forfeited

  The automatic enrollment default rate of 5% — capturing the full employer match — represents one of the most consequential behavioral nudges in federal retirement policy. Before the 2020 change, the default rate was 3%, leaving a significant portion of employees below the full-match threshold. Federal employees who never change their contribution elections will nonetheless receive the full agency match automatically.

  Recent rulemakings: 87 FR 31672 (May 2022) — updated automatic enrollment rules and clarified catch-up contribution procedures; 77 FR 26422 (May 2012) — initial Roth TSP implementation.

• 5 CFR Part 1600–1690 — Thrift Savings Plan (broader Part range covering eligibility, fund management, loans, withdrawals, and beneficiary designations; see individual Parts below for detail)

• 5 CFR Part 1639 — Claims Collection (35 sections across 5 subparts — the Federal Retirement Thrift Investment Board's procedures for recovering overpayments and delinquent debts owed to the Thrift Savings Fund or to other federal agencies; implements 5 U.S.C. § 8474 and 31 U.S.C. §§ 3711, 3716, 3720A, 3720D). FRTIB has four primary collection tools, each with distinct procedural requirements:

  • General collection (§§ 1639.3–1639.9): when a debt is identified, the Executive Director sends a written initial notice stating the amount, nature, and legal basis; interest accrues from the date the notice is mailed (§ 1639.8); the Executive Director may compromise debts up to $100,000 (excluding interest) without additional approval; FRTIB may report delinquent debts to credit reporting agencies (§ 1639.5); may contract with private collection agencies (§ 1639.6); and must refer uncollected debts to DOJ for litigation when all other methods are exhausted (§ 1639.10); FRTIB maintains a cross-servicing agreement with Treasury that authorizes Treasury to execute collection actions on FRTIB's behalf (§ 1639.11); collected funds are deposited into the Thrift Savings Fund (or credited to the requesting agency for inter-agency offsets) (§ 1639.12)
  • Critical anti-alienation protection (§ 1639.13): a participant's TSP account balance cannot be used to satisfy debts owed to the Board or to other federal agencies under this Part; this directly implements the TSP anti-alienation provision at 5 U.S.C. § 8437 and means FRTIB cannot garnish or set off a participant's TSP account even to recover FRTIB's own overpayments — the collection tools in Part 1639 apply to salary, tax refunds, and administrative offsets from other government payments, not to TSP account assets
  • Salary offset (§§ 1639.20–1639.30): FRTIB may deduct from a federal employee's paycheck to recover a debt, but must first provide 30 days' advance written notice before starting deductions (§ 1639.22); the employee may request a formal hearing to contest the debt's existence or amount, or the proposed repayment schedule (§ 1639.23); as an alternative, the employee may propose a voluntary repayment agreement — paying the debt in installments directly rather than through paycheck deductions (§ 1639.25); a special review is available at any time if the debtor's financial situation changes (§ 1639.26); an employee who makes payments under protest does not waive the right to challenge the debt later (§ 1639.30)
  • Tax refund offset (§§ 1639.40–1639.42): FRTIB may coordinate with Treasury to intercept a debtor's federal tax refund; before referral to Treasury's TOP (Treasury Offset Program), FRTIB must notify the debtor of the amount owed and provide 60 days to repay voluntarily (§ 1639.42); refunds intercepted under this authority go to the Thrift Savings Fund
  • Administrative offset (§§ 1639.50–1639.60): FRTIB may request that other federal agencies withhold payments they owe a debtor (travel reimbursements, contract payments, retirement benefits other than TSP) and remit those amounts to FRTIB; conversely, FRTIB may honor offset requests from other agencies (§ 1639.55); certified mail notice is required before offset; administrative wage garnishment of non-federal employees' wages is also authorized under 31 U.S.C. § 3720D (§ 1639.60)

• 5 CFR Part 1620 — Expanded and Continuing TSP Eligibility (the FRTIB rules extending TSP participation to four categories of employees whose access to the plan is not automatic; implements 5 U.S.C. §§ 8440a, 8432b, and 8474). Standard federal civilian TSP eligibility flows automatically from FERS or CSRS enrollment; Part 1620 addresses edge cases where workers fall between coverage categories:

  • Cooperative extension service employees (§§ 1620.10–1620.14): state cooperative extension service employees appointed by land-grant universities to carry out USDA extension programs may participate in TSP; their employing authority (the university or state extension service) may make discretionary FERS-type employer contributions — agency matching is not mandatory as it is for regular federal agencies; retroactive contributions are allowed when an employee's eligibility is established after a gap; the employing authority transmits both employee contributions and any employer contributions to the TSP record keeper under the standard FRTIB procedures
  • Federal judges and magistrates (§§ 1620.20–1620.23): Article III judges, magistrate judges, bankruptcy judges, and other federal judicial officers have full TSP contribution rights under 5 U.S.C. § 8440a; spousal rights from 5 U.S.C. § 8351(b)(5) apply — a judge's spouse has standing to challenge TSP withdrawals; upon separation from the bench (retirement, death, non-renewal of term), the judge may make post-employment withdrawal elections under the standard TSP withdrawal procedures
  • Non-Appropriated Fund (NAF) instrumentality employees (§§ 1620.30–1620.36): DOD and Coast Guard civilian employees who work for NAF entities (commissaries, recreational facilities, exchange systems) face a bidirectional coverage election when they move between federal-appropriated and NAF positions. Moving from a federal appropriated-fund position to a NAF position while electing to keep FERS/CSRS coverage: the employee retains TSP eligibility. Moving from a NAF position to a federal appropriated-fund position and electing the NAF retirement system instead of FERS: the employee loses TSP eligibility. The employee's TSP account balance is preserved and follows normal TSP rules regardless of the election; eligibility to make new contributions is what changes.
  • Military service restoration (§§ 1620.40+): federal employees separated or placed on leave without pay (LWOP) for active military service who return to their federal position may restore the TSP contributions they were unable to make during their military absence; the restoration window is tied to the reemployment rights timeline (generally 90 days for shorter tours, up to 5 years); employers must make the missed agency contributions (both automatic 1% and any match) for the restoration period; employees must affirmatively elect to make restoration contributions — the catch-up is not automatic upon return

• 5 CFR Part 1653 — Court Orders and Legal Processes Affecting Thrift Savings Plan Accounts (21 sections across four subparts — the FRTIB rules governing when and how TSP accounts can be reached by court orders; implements 5 U.S.C. § 8432d). The TSP's core anti-alienation protection (5 U.S.C. § 8437) normally prevents any person or court from reaching TSP account balances to satisfy debts. Part 1653 defines the four narrow exceptions where TSP must comply with legal processes:

  • Subpart A — Retirement benefits court orders (§§ 1653.1–1653.6): the TSP equivalent of a QDRO for divorce or property division; to be qualifying, the order must expressly name "Thrift Savings Plan" or "TSP" — a generic order dividing "all retirement accounts" is not sufficient and TSP will not honor it; the order must specify a dollar amount to be paid (not a percentage of the account — TSP calculates the amount from the balance); TSP calculates entitlement using the account balance as of the "entitlement date" specified in the order, including any outstanding loan balance unless the order explicitly excludes it; payment is made "as soon as administratively practicable" after the decision letter; the TSP record keeper charges a $600 processing fee upon receipt of any complete court order document — whether draft or final — before reviewing it
  • Subpart B — Child support and alimony garnishment (§§ 1653.11–1653.16): the TSP record keeper honors qualifying legal processes (court orders or writs of garnishment) to enforce a participant's obligation to pay child support or current alimony (ongoing support, not a lump-sum property settlement); the process must specify a dollar amount and meet the same format requirements as retirement court orders; the $600 fee applies; payment is made as soon as practicable after the decision letter; TSP will not honor legal processes that attempt to reach TSP funds for past-due child support arrears under standard debt collection procedures — only current-payment enforcement under this subpart qualifies
  • Subpart C — Child abuse court orders (§§ 1653.21–1653.23): courts may enforce money judgments against a TSP participant for injuries caused by abuse of a child (including sexual abuse); the child abuse order is processed under the same procedures as Subparts A and B; the $600 fee applies
  • Subpart D — Federal tax levy and criminal restitution (§§ 1653.31–1653.36): two final exceptions: (1) a qualifying IRS tax levy (certified by IRS against the participant's TSP account) must meet specific requirements including certification that the IRS demand for payment has been made and the participant has not paid; (2) a qualifying criminal restitution order must be ordered by a federal court in the sentencing of the participant — civil judgments and state court criminal orders do not qualify; for both types, payment is made 30 days after the decision letter (unlike the "as soon as practicable" rule for divorce orders); the payable amount is limited to the stated dollar amount or the participant's calculated entitlement (account balance), whichever is less

  Three practical traps for people navigating TSP in divorce or family law proceedings: (1) The $600 fee is charged immediately on receipt of any complete draft order — if you submit multiple draft versions for TSP review before finalizing, each complete submission triggers the fee; work with an attorney experienced in federal benefit orders to minimize drafts. (2) Percentage orders are rejected — if your divorce decree divides retirement assets by percentage (common in state court), the TSP will not honor that percentage; the order must be converted to a specific dollar amount tied to the account balance as of a specific date. (3) Loan balances are included in the divisible amount by default — if the participant has an outstanding TSP loan, the loan balance is added to the account balance when calculating the payee's share, unless the order specifically excludes it. Recent rulemakings: 90 FR 13408 (February 2025) updated processing procedures; 87 FR 31691 (May 2022) clarified qualifying requirements for retirement benefits court orders.

• 5 CFR Part 1601 — Participants' Choices of TSP Funds (investment elections, fund reallocations, fund transfers, and the TSP mutual fund window). Key provisions:

  • § 1601.12–1601.13 — Investment elections: future deposits (contributions, loan repayments, rollovers) are allocated among TSP core funds based on the most recent election on file; elections must be made in 1% increments summing to 100%; participants may change elections at any time, effective prospectively
  • § 1601.21–1601.23 — Fund reallocations and transfers: participants may move existing balances among the TSP core funds (G, F, C, S, I) at any time; reallocations redistribute the entire account balance; transfers move specific dollar amounts from selected funds; both types are processed in whole percentages (1% increments)
  • § 1601.40 — Lifecycle Funds: the FRTIB establishes TSP Lifecycle (L) Funds as target-date asset allocation portfolios investing solely in the five core funds; the Executive Director sets the allocation glide path and rebalancing schedule; L Funds automatically shift toward more conservative allocations as the target date approaches
  • § 1601.51–1601.53 — Mutual fund window: participants may transfer balances from TSP core funds into a mutual fund window account providing access to thousands of outside mutual funds; the $55 annual administrative fee is charged to mutual fund window users, redetermined every three years based on average costs; minimum transfer amounts apply; TSP core fund assets must remain at a specified minimum before funds can be moved into the window
  • § 1601.33 — Acknowledgment of risk: uniformed services participants who entered service before January 1, 2018, and who have not elected the Blended Retirement System, and civilian participants who enrolled before September 5, 2015, must execute an acknowledgment of risk before investing in any TSP fund other than the G Fund; this protects participants who enrolled under older rules where the G Fund was the only default

  The TSP core funds span the full risk spectrum: the G Fund (Treasury securities, no credit risk), the F Fund (fixed income index), the C Fund (large-cap U.S. equities), the S Fund (small/mid-cap U.S. equities), and the I Fund (international equities). The Lifecycle Funds automate asset allocation for participants who prefer a hands-off approach. The mutual fund window — added in June 2022 — extends access to thousands of commercially available funds but comes with fees and complexity that the FRTIB cautions most participants don't need. Recent rulemakings: 87 FR 31695 (May 2022) established the mutual fund window framework and § 1601.51–1601.53.

• 5 CFR Part 1651 — Death Benefits (who receives a TSP account when a participant dies, in what order, and how the payment is made):

  • § 1651.2 — Order of payment: TSP account balances of deceased participants are paid in this order: (1) designated beneficiary on file with the TSP record keeper; (2) if no designation, the spouse; (3) if no spouse, the children in equal shares (with a deceased child's share going to their descendants); (4) parents in equal shares; (5) executor or administrator of the estate; (6) next of kin under the law of the state where the participant lived at death
  • § 1651.3 — Designation of beneficiary: any individual, firm, corporation, or legal entity may be named; designations must be submitted in FRTIB-prescribed form; the most recent valid designation supersedes all prior ones; a TSP designation is not affected by the participant's will — the TSP designation controls regardless of state probate law
  • § 1651.5 — Spouse: for purposes of the spousal default under § 1651.2(a)(2), "spouse" is the person the participant was married to at the date of death — a common-law spouse recognized by the state where the participant lives qualifies
  • § 1651.10–1651.11 — Deceased and simultaneous death: if a designated beneficiary predeceases the participant, that beneficiary's share goes to the other designated beneficiaries pro rata; if a beneficiary dies at the same time as the participant (same hour and minute), that beneficiary is treated as having predeceased
  • § 1651.12 — Homicide: a beneficiary under investigation as a suspect in the participant's death will not receive payment while the investigation is open; if implicated in the death, the beneficiary is treated as having predeceased the participant
  • § 1651.14 — How payment is made: death benefits are disbursed pro rata from the participant's traditional and Roth balances; the traditional payment is further pro rated between the tax-deferred and tax-exempt portions; lump-sum payment is the default; beneficiary participant accounts may be established for eligible surviving spouses in lieu of immediate distribution
  • § 1651.19 — Beneficiary participant accounts: a surviving spouse who is a beneficiary may establish a beneficiary participant account rather than taking an immediate lump-sum distribution; the account is invested in the same funds as the deceased participant's account on the date of death; the surviving spouse may subsequently make fund reallocations; RMD rules apply based on the surviving spouse's age

  The TSP death benefit order of precedence is a frequent source of confusion in estate planning: the TSP beneficiary designation on file with the TSP record keeper controls — not the participant's will. A participant who names an ex-spouse as TSP beneficiary and later remarries but never updates the TSP form will have the TSP account paid to the ex-spouse regardless of what the will says. This is similar to life insurance and IRA beneficiary designations, where beneficiary forms override testamentary documents. Divorce decrees that purport to divide TSP accounts must be submitted as qualifying retirement benefits court orders under 5 CFR Part 1653 — not through the death benefit system. Recent rulemakings: 87 FR 31691 (May 2022) updated Part 1651 to clarify beneficiary participant account establishment.

• 5 CFR Part 1655 — Loan Program (the rules governing when and how active TSP participants may borrow from their own account):

  • § 1655.2 — Eligibility: a participant may apply for a general purpose loan or residential loan if (1) more than 30 business days have elapsed since the participant repaid any prior TSP loan in full; (2) the participant is in pay status (not separated or on non-pay status beyond the allowed limit); and (3) the account has sufficient vested balance; participants may have one general purpose and one residential loan outstanding simultaneously, but not two of the same type at the same time
  • § 1655.4 — Loan amounts: minimum loan is $1,000; maximum is the lesser of (a) 50% of the participant's vested account balance or (b) $50,000 minus the highest outstanding loan balance in the prior 12 months (the IRS limit under IRC § 72(p)); loans cannot exceed the vested account balance
  • § 1655.6 — Loan term: general purpose loans have a maximum term of 5 years; residential loans (for purchase of a primary residence) have a maximum term of 15 years; the loan is amortized in level payments; the minimum term is 1 year
  • § 1655.14 — Loan payments: participants who have not separated must repay through payroll deduction; the employing agency cannot stop deductions without the participant's consent except in specific circumstances; participants on non-pay status (military leave, parental leave) may make direct payments
  • § 1655.15 — Deemed distributions and loan offsets: if a loan goes into default — because the participant separates and fails to repay, or misses too many payroll deductions — the outstanding balance becomes a deemed distribution under IRC § 72(p), meaning it is taxable in the year of default and subject to the 10% early withdrawal penalty if the participant is under 59½; the loan is then converted to an in-service withdrawal (loan offset) and reported to the IRS as income
  • § 1655.16–1655.17 — Reamortization and prepayment: when a participant's pay cycle changes, the loan must be reamortized; participants may prepay a loan in full at any time without penalty — prepayment requires payment of all remaining principal and accrued interest; partial prepayments reduce the remaining principal but do not shorten the term unless requested
  • § 1655.18 — Spousal rights: before a loan is disbursed to a CSRS participant (not FERS), the TSP record keeper notifies the participant's spouse; the CSRS participant may obtain a spousal waiver but the spouse has a right to notice and a 45-day window to object (the FERS rules are less restrictive)

  TSP loans are often marketed informally as a "free" way to access retirement savings — but the real cost is the opportunity cost of removing invested assets from tax-deferred growth. A $30,000 general purpose loan at 4.5% over 5 years means $30,000 is no longer compounding in the TSP funds during that period. If the participant leaves federal service before repayment, the entire outstanding balance becomes a taxable deemed distribution — a common trap for federal employees who take loans and then separate. Recent rulemakings: No major amendments to Part 1655 since 2020; FRTIB updated processing systems in 2022 to align with the mutual fund window rollout.

• 5 CFR Part 1631 — Availability of Records (30 sections across 3 subparts — the Federal Retirement Thrift Investment Board's Freedom of Information Act procedures and rules governing subpoenas for FRTIB employee testimony; participants who need records from FRTIB use this Part):

  • Subpart A — FOIA requests (§§ 1631.1–1631.19): FRTIB's FOIA Officer (the Board's General Counsel or designee) processes records requests; all FRTIB records are presumptively available unless falling under one of the standard nine FOIA exemptions (§ 1631.15–1631.16); fee categories follow OMB guidelines — commercial requesters pay for search, review, and duplication; news media and educational institutions pay only duplication; fee waivers apply when disclosure is in the public interest and not primarily commercial (§ 1631.12); fees estimated over $250 require prepayment (§ 1631.13); adverse determinations (denials, insufficient search, fee disputes) may be appealed to the Executive Director in writing (§ 1631.10)
  • Subpart B — Subpoenas and court demands (§§ 1631.30–1631.36): when a court or other authority demands that a FRTIB employee testify about official information or produce FRTIB records in a legal proceeding, the demand must be approved by the General Counsel before the employee complies (§ 1631.32); FRTIB will not allow testimony about confidential TSP participant records, internal deliberative processes, or any matter where compliance would be inconsistent with agency function; a court order must be obtained if FRTIB declines and the requesting party wants to compel compliance (§ 1631.36)
  • Subpart C — Administrative subpoenas (§§ 1631.40–1631.43): FRTIB may issue administrative subpoenas for records and testimony in its own investigations (e.g., investigating potential TSP fraud or improper access to participant accounts); employee compliance with FRTIB administrative subpoenas is mandatory; employees who receive informal requests (not through official channels) for FRTIB records must notify the General Counsel before responding (§ 1631.42)

  The practical FOIA application for TSP participants: if you need documentation of your TSP account history, contribution records, investment elections, loan history, or FRTIB communications about your account, submit a FOIA request to tsp.gov (TSP's record keeper processes account-level requests under FRTIB's procedures). Account statements and transaction confirmations are generally available through the My Account portal without a formal FOIA request; FOIA becomes useful for older records, audit trails, or correspondence about disputed account actions. The exemption most likely to apply to TSP participant data is Exemption 6 (personal privacy) — FRTIB will redact other participants' information from any records it releases. Recent rulemakings: 89 FR 19225 (March 2024) updated Part 1631 fee schedules; 82 FR 24826 (May 2017) implemented the 2016 FOIA Improvement Act requirements for FRTIB.

• 5 CFR Part 1632 — FRTIB Government in the Sunshine Act — Public Observation of Meetings (11 sections — the Federal Retirement Thrift Investment Board's regulations implementing 5 U.S.C. § 552b, which requires certain multi-member federal agencies to hold their meetings open to public observation): the FRTIB Board consists of five members — one each appointed by the Senate majority and minority leaders, one each by the House majority and minority leaders, and the Executive Director as a non-voting member; because FRTIB is a multi-member agency, its Board meetings to discuss and vote on TSP fund options, plan design, investment policy, and administrative matters are subject to the Sunshine Act's openness requirement; key provisions:

  • § 1632.3 — Conduct of agency business: Board members may not jointly conduct or dispose of Board business outside of properly noticed meetings; informal email chains or phone calls among Board members resolving substantive Board questions would violate the Act
  • § 1632.5 — Public announcement: FRTIB must publish notice of each open meeting at least one week in advance in the Federal Register, stating the time, place, and agenda items; emergency meetings may be announced with shorter notice when delay would impair Board functions
  • § 1632.6–1632.8 — Grounds for closure: the Board may close meetings or portions thereof when discussing personnel matters affecting specific individuals, protecting trade secrets or proprietary information from financial institutions (relevant for TSP recordkeeper procurement), discussing ongoing litigation, or protecting other Sunshine Act exemptions; most substantive TSP policy decisions (fund lineup changes, fee reviews, investment policy) are made in open session
  • § 1632.10 — Transcripts and recordings: the Board must maintain complete transcripts or electronic recordings of all meetings (open and closed); open-meeting transcripts must be made available for public inspection; closed-meeting transcripts are available to the extent not covered by an exemption
  • § 1632.11 — Inspection and copies: any person may inspect or copy open-meeting transcripts at FRTIB's offices; copies are provided at duplication cost

  FRTIB's open meetings are particularly significant for federal employee advocates and plan consultants who follow TSP's investment fund lineup changes, fee negotiations with the TSP recordkeeper, and Board decisions on new product offerings (such as the mutual fund window launched in 2022). Meeting notices and transcripts are published on the FRTIB website at frtib.gov.

• 5 CFR Part 1630 — FRTIB Privacy Act Regulations: FRTIB's implementing rules for the Privacy Act of 1974 (5 U.S.C. § 552a) governing the collection, maintenance, use, and disclosure of personal information in FRTIB's systems of records; the primary system of record is TSP participant account data — approximately 7 million active participants' contribution histories, investment elections, beneficiary designations, loan records, and distribution data; participants have the right to access and request correction of their own TSP account records; routine uses include disclosure to IRS for tax reporting and to TSP record keepers; FRTIB may not disclose participant information to third parties (including other federal agencies) without written consent or a routine use exception; the Privacy Act's accounting requirement mandates FRTIB track disclosures of protected records.

• 5 CFR Part 1605 — Correction of Administrative Errors (18 sections — the FRTIB rules governing makeup contributions, removal of erroneous contributions, and adjustments for back pay awards and misclassified retirement coverage):

  • § 1605.11 — Makeup contributions: when an employing agency error causes a participant to miss TSP contributions they were entitled to receive, the agency must make makeup contributions; makeup contributions include the missed employee contributions and any missed agency automatic (1%) and matching contributions; interest accrues on missed amounts from the date contributions should have been made
  • § 1605.12 — Removal of erroneous contributions: when contributions are mistakenly made (excess contributions, wrong account, wrong type), FRTIB processes a negative adjustment removing the funds; earnings attributed to the erroneous period are forfeited if the error involved excess contributions; the agency — not the participant — is liable for any losses caused by agency processing errors
  • § 1605.13 — Back pay awards and retroactive pay adjustments: when a participant receives a back pay award covering a period of separation from federal service, the employing agency must calculate and remit the TSP contributions that would have been made during that period; contributions are based on the back pay amount at the contribution percentage in effect during the award period; agency matching contributions must be recalculated and remitted; the TSP record keeper credits contributions as of the "as of" date (the original pay date), preserving the participant's notional investment growth
  • § 1605.14 — Misclassified retirement system coverage: when an employee is misclassified as FERS instead of CSRS (or vice versa) and the error is corrected, TSP contributions must be adjusted retroactively; excess employee contributions (attributable to the wrong plan's contribution rates) are refunded; any missed contributions (due to lower contribution rates under the misclassified plan) are made up by the agency
  • § 1605.16 — Claims time limitations: employing agencies must correct errors discovered within the past six months immediately without a formal claim; errors older than six months require a written claim from the participant; FRTIB will not process corrections for errors more than six years old unless a formal Equal Employment Opportunity complaint or legal proceeding is pending (§ 1605.16(e))
  • § 1605.17 — Redesignation and recharacterization: if agency error caused contributions to go to a participant's traditional balance when they should have gone to Roth (or vice versa), the agency may request redesignation or recharacterization; this corrects the tax treatment without requiring the participant to withdraw and recontribute

  Part 1605 matters most to federal employees who experience payroll processing errors — a common occurrence given the complexity of federal pay systems across multiple agencies, pay periods, and contribution types. An employee who separated from a federal position, received a back pay settlement from MSPB, and returned to federal service may have both makeup and back pay adjustment obligations under Part 1605 simultaneously. The six-year lookback limit is a hard cap — errors older than six years cannot be corrected through the FRTIB administrative process even if clearly the agency's fault.

Pending Legislation (119th Congress)

• HR 7357 — TSP Fiduciary Security Act of 2026. Would impose a national-security test on TSP investments and voting, ban PRC-linked funds in the mutual fund window, and add new rules and limited fiduciary immunity. Status: Introduced.
• S 1368 (Sen. Scott, R-FL) — TSP Fiduciary Security Act of 2025. Would force TSP decisions to prioritize U.S. national security, ban PRC-based mutual fund holdings, and require Labor rules plus annual congressional reporting. Status: Introduced.
• S 3263 — Stop TSP ESG Act. Bars outside professional managers from voting securities held by the Thrift Savings Fund and keeps voting authority with the TSP Board. Status: Introduced.

Recent Developments

• DOGE workforce reductions create TSP vesting risk for newer employees: The DOGE initiative's federal workforce reductions — including the "Fork in the Road" deferred resignation program and subsequent RIF (Reduction in Force) actions — affect TSP in two ways. First, employees who accepted deferred resignation may not serve long enough to satisfy the 3-year vesting requirement for the automatic 1% agency contribution. Second, RIF separations before vesting forfeit the automatic 1% entirely. Employees considering deferred resignation or facing RIF should calculate their vesting status before leaving; the unvested automatic contribution can represent $15,000-$30,000 or more for mid-career employees.
• Enhanced catch-up (ages 60-63) now available in TSP: Following SECURE 2.0, TSP implemented the enhanced catch-up for federal and military members ages 60-63. For 2026, TSP participants in that age window can contribute $11,250 in catch-up contributions on top of the $24,500 base limit — a total of $35,750 in employee contributions. TSP was one of the slower retirement plan providers to implement this change; participants should verify the enhanced amount is available in their account before the end of the year.
• I Fund international exposure expanded (2024): TSP's I Fund (international index) was updated in 2024 to track the MSCI ACWI ex-USA IMI index, replacing the narrower MSCI EAFE index. The change added exposure to Canada and emerging markets (including China, India, and Brazil). The new index is broader and more representative of the international equity market, though it also introduces emerging market volatility. Federal employees with I Fund allocations should understand their portfolio changed without any action required on their part.
• TSP mutual fund window remains an option but rarely optimal: TSP added a brokerage mutual fund window allowing access to thousands of outside funds — but with additional fees ($95/year + $28.75/trade). For most participants, TSP's core funds (expense ratios ~0.04%) remain far more cost-effective than the mutual fund window. The window is primarily useful for participants with specific investment needs (sector funds, additional international exposure) that the core lineup doesn't provide.