HELOC Interest Deductibility
Home equity line of credit (HELOC) interest deductibility — governed by 26 U.S.C. § 163(h) — was fundamentally changed by the Tax Cuts and Jobs Act (2017): interest on home equity debt is now only deductible if the borrowed funds are used to buy, build, or substantially improve the residence that secures the loan. Interest on HELOCs used for debt consolidation, car purchases, vacations, or any purpose other than home improvement is not deductible, regardless of the loan's collateral. Before TCJA, interest on up to $100,000 of home equity debt was deductible for any purpose — making HELOCs a popular vehicle for tax-advantaged borrowing. The combined limit on deductible home acquisition and equity debt is now $750,000 (down from $1 million pre-TCJA) for mortgages taken after December 15, 2017, though loans originated before that date are grandfathered at the old $1 million limit. The deductibility restriction applies only to itemized deductions — since the TCJA also nearly doubled the standard deduction, far fewer taxpayers itemize at all, making the HELOC interest deduction less relevant for most households even when the use-of-proceeds test is met. The TCJA provisions are permanent under the One Big Beautiful Bill Act (2025), eliminating the prior sunset risk that had complicated HELOC planning. For homeowners who plan to use HELOC funds for qualifying home improvements, careful documentation of how borrowed funds are used is essential — the IRS can challenge deductions where funds are commingled with non-qualifying expenditures.
Current Law (2026)
Under current federal law, home equity loan/HELOC interest is only deductible if the funds are used to buy, build, or substantially improve the residence securing the loan. Interest on HELOCs used for other purposes (debt consolidation, car purchase, vacation) is NOT deductible.
| Parameter | Current law | Pre-2018 law |
|---|---|---|
| Deductible use | Acquisition/improvement only | Any purpose |
| Combined with mortgage | $750,000 total acquisition debt limit | $1M acquisition + $100K equity |
| Itemizing required | Yes | Yes |
Legal Authority
- 26 U.S.C. § 163(h) — Qualified residence interest (defines what mortgage and home equity interest is deductible)
- IRS Advisory Opinion 2018-32 — Clarified that under TCJA, home equity loan interest remains deductible if used to buy, build, or substantially improve the qualifying residence
How It Works
Under 26 U.S.C. § 163(h), HELOC interest is deductible only as "acquisition indebtedness" — debt used to buy, build, or substantially improve the residence securing the loan. The critical test is use of proceeds, not what the loan is called: a home equity line used to gut and renovate a kitchen is acquisition debt and the interest is deductible; the same line drawn to pay off credit cards or buy a car is personal debt and the interest is not deductible, regardless of the collateral. Before the Tax Cuts and Jobs Act of 2017, a separate category of home equity indebtedness up to $100,000 was deductible for any purpose — that rule is gone, and the One Big Beautiful Bill Act of 2025 made the TCJA restriction permanent.
The $750,000 combined debt cap applies to total acquisition debt on your primary and one secondary residence — first mortgage balance plus any HELOC used for qualifying improvements. If your first mortgage is at $700,000 and you draw $100,000 for a kitchen remodel, only $50,000 of the HELOC falls within the combined $750,000 cap; interest on the remaining $50,000 is not deductible even though the funds were used for qualifying home improvement. Mortgages originated before December 16, 2017 are grandfathered at the old $1 million cap — check your origination date before calculating available headroom. For mixed-use HELOCs — where some draws went to qualifying improvements and others to personal spending — you must trace the funds and allocate interest proportionally. Drawing $30,000 for a bathroom remodel and $20,000 for a car means only 60% of the interest is deductible. Commingling HELOC proceeds in a general checking account makes this tracing extremely difficult to document cleanly for the IRS.
Claiming the deduction requires itemizing on Schedule A. With the 2026 standard deduction at $32,200 for married filing jointly, most homeowners won't itemize on HELOC interest alone — you'd need substantial qualifying mortgage interest, SALT deductions, and charitable contributions to clear the bar. The deduction applies only to a primary and one secondary residence: a HELOC on a vacation property already designated as your second home qualifies; a third property does not. See Mortgage Interest Deduction for the full interaction with your primary mortgage's deductibility.
How It Affects You
If you're planning a home renovation: A HELOC used for home improvements is one of the most tax-efficient ways to borrow for homeowners who itemize. On a $50,000 HELOC drawn at 8.5% interest, you'd pay roughly $4,250 in first-year interest. At the 24% bracket, that's approximately $1,020 in tax savings — reducing your effective borrowing rate from 8.5% to about 6.5%. The documentation rule is strict: keep contractor invoices, building permits, and bank statements showing HELOC proceeds disbursed to contractors or for improvement-specific purchases. If you draw the HELOC into your general checking account and mix it with personal spending, the IRS can disallow the portion it can't trace to qualifying home improvement. For large projects: calculate your deductible cap before drawing. Total acquisition debt (first mortgage + HELOC used for improvement) above $750,000 loses the interest deduction for the excess.
If you're using a HELOC for debt consolidation or personal expenses: Under current law — made permanent by the OBBBA — personal-use HELOC interest is not deductible, full stop. If you're consolidating $30,000 in credit card debt from 24% APR into a HELOC at 8.5%, the interest rate savings are substantial ($2,550/year vs. $7,200/year in interest), but there is no federal tax deduction on top of that. Don't let a lender pitch the "tax-deductible interest" angle for personal-use HELOCs — it hasn't been true since 2018, and the OBBBA made that restriction permanent.
If your total mortgage debt is near or above $750,000: Calculate the deductible cap before drawing. If your first mortgage balance is $700,000 and you draw a $100,000 HELOC for a kitchen renovation, only $50,000 of the HELOC falls within the combined $750,000 cap — interest on the remaining $50,000 is not deductible even though the funds were used for qualifying home improvement. Your pre-TCJA mortgage (originated before December 16, 2017) is grandfathered at the old $1 million cap — so if your mortgage predates TCJA, you may have more deductible headroom than you think. Check your closing disclosure or mortgage origination date to confirm which cap applies.
If you're deciding between a HELOC, home equity loan, or cash-out refinance: All three produce deductible interest when used for qualifying home improvements — the tax treatment is identical. The strategic difference: a cash-out refinance replaces your entire existing first mortgage at current rates (approximately 6.5-7.5% for 30-year fixed in 2026), while a HELOC or second-lien home equity loan leaves your existing first mortgage intact. If you locked in a sub-4% first mortgage in 2020-2021, replacing it via cash-out refinance would dramatically increase your total interest cost — a HELOC at 8-8.5% on the incremental renovation amount is almost always better in that scenario. Also check whether itemizing makes sense at all: with the 2026 standard deduction at $16,100 (single) / $32,200 (MFJ), HELOC interest alone rarely pushes a household into itemizing territory — you'd need substantial mortgage interest on a large balance, SALT, and charitable contributions to clear the bar.
Homeowners using HELOCs for home improvements may also qualify for home energy efficiency credits if the improvements meet energy-saving requirements.
State Variations
State treatment generally follows federal rules for states that conform to the IRC. Notable exceptions:
- CA: Conforms to TCJA treatment — HELOC interest only deductible for acquisition purposes
- NY: Generally conforms, but the state's high SALT burden means fewer taxpayers benefit from itemizing
- States that haven't adopted post-2017 IRC changes may still allow the old $100,000 home equity interest deduction for state tax purposes — check your state's IRC conformity date
Implementing Regulations
- 26 CFR §§ 1.163-10 through 1.163-11 — Qualified residence interest, home equity indebtedness limitations, allocation of debt proceeds
- Temp. Reg. § 1.163-10T — Qualified residence interest allocation rules for mixed-use debt
Pending Legislation (119th Congress)
- HR 430 (Rep. Garbarino, R-NY) — SALT Deductibility Act: repeals the $10,000 SALT cap. While not directly about HELOCs, restoring full SALT deductibility would push more homeowners over the itemizing threshold, making HELOC interest deductions relevant to more filers. Status: Introduced.
Recent Developments
- Current use-of-proceeds rule is now permanent law: The One Big Beautiful Bill Act made permanent the rule that personal-use home equity interest is not deductible, so HELOCs used for debt consolidation, tuition, or consumer spending do not generate a federal interest deduction.
- Itemizing calculus changed more than the tracing rule: The bigger 2025-2026 shift for many households is not whether HELOC interest qualifies, but whether they itemize at all given the large standard deduction and the higher temporary SALT cap.
- HELOC demand and rising home equity: The sharp home price appreciation of 2020-2023 (average home prices up 40%+) created significant untapped home equity. As mortgage rates rose to 6-7%+ in 2023-2025, homeowners were reluctant to refinance (the "lock-in effect") but tapped equity through HELOCs for home improvements, college costs, and small business needs. Average HELOC balances have increased. When used for qualifying home improvement purposes, the interest remains deductible for itemizers — providing a tax-advantaged source of improvement financing compared to personal loans or credit cards.
- HELOC rates and Fed monetary policy: HELOC interest rates are variable and tied to the prime rate (which tracks the federal funds rate). The Fed's rate increases from 0.25% in early 2022 to 5.25-5.5% in 2023-2024 pushed HELOC rates from approximately 4% to 9-10% — dramatically reducing their attractiveness for discretionary spending. As the Fed cut rates in late 2024 (reducing the federal funds rate to approximately 4.25-4.5%), HELOC rates declined modestly. Homeowners considering HELOCs for home improvement in 2026 are borrowing at approximately 8-8.5% — still significantly higher than the mortgage rates locked in during 2020-2022.