Portal-to-Portal Act — Compensable Work Time & FLSA Statute of Limitations

The Portal-to-Portal Act of 1947 (29 U.S.C. §§ 251–262) defines the boundaries of compensable work time under the Fair Labor Standards Act — answering the critical question: when does the workday start and stop for purposes of minimum wage and overtime? It interacts with other wage statutes governing federal contractors, including the Davis-Bacon Act and the Service Contract Act, which apply their own compensable-time rules on top of the baseline FLSA framework. The Act was Congress's response to a wave of lawsuits in which workers claimed overtime pay for activities before and after their core work duties — walking from the factory gate to the workstation ("portal-to-portal" time), changing into work clothes, washing up after dirty work, commuting to remote worksites, and other pre- and post-shift activities. The Supreme Court had broadly defined compensable time in Anderson v. Mt. Clemens Pottery Co. (1946), triggering $6 billion in potential claims (in 1947 dollars). Congress responded by excluding from compensable time preliminary and postliminary activities that are not "integral and indispensable" to the employee's principal work activities. The Act also sets the statute of limitations for FLSA claims (2 years, or 3 years for willful violations), establishes defenses for employers who relied on administrative guidance, and authorizes courts to reduce or eliminate liquidated damages for good-faith violations.

Current Law (2026)

Legal Authority

• 29 U.S.C. § 254 — Compensable time (activities that are "preliminary" or "postliminary" to the principal activity — such as walking to the workstation, waiting in line, changing clothes — are not compensable work time unless made compensable by contract, custom, or practice; the "continuous workday" begins when the first principal activity starts and ends when the last principal activity finishes)
• 29 U.S.C. § 255 — Statute of limitations (FLSA claims must be filed within 2 years of the violation; 3 years for willful violations; each paycheck with an underpayment is a separate violation)
• 29 U.S.C. § 259 — Reliance on administrative rulings (no employer shall be liable if it acted in conformity with and in reliance on a written administrative regulation, order, interpretation, or enforcement policy of the Administrator of the Wage and Hour Division)
• 29 U.S.C. § 260 — Liquidated damages (court may award no liquidated damages or reduce them if the employer shows it acted in good faith and had reasonable grounds to believe it was not violating FLSA)

How It Works

The central question in Portal-to-Portal Act cases is whether a pre-shift or post-shift activity is integral and indispensable to the employee's principal work activities. If yes, it's compensable; if it's merely preliminary or postliminary, it's not. Putting on specialized protective equipment (a hazmat suit, a construction safety harness, sterile gowning in a pharmaceutical plant) is generally compensable because safety gear is integral to performing the job safely. Walking from the parking lot to the time clock is generally not compensable because it's merely traveling to the workplace. Post-shift security screening at an Amazon warehouse is not compensable — Integrity Staffing Solutions v. Busk (2014) held that security screening was not integral to warehouse work itself. The continuous workday rule ties these determinations together: once the first principal activity begins — even if it's a qualifying preliminary activity — the continuous workday has started, and all subsequent time (walking between stations, waiting for materials, short breaks) is compensable until the last principal activity ends. If donning safety equipment starts at 6:45 AM and machine operation doesn't start until 7:00 AM, the 15 minutes of walking and waiting in between are compensable hours worked.

The statute of limitations is one of the Act's most practically significant provisions: FLSA overtime and minimum wage claims must be filed within 2 years of the violation — or 3 years for willful violations (employer knew or showed reckless disregard for FLSA compliance). Because each paycheck is a separate violation, the statute operates as a rolling window — you can sue for underpayments in the most recent 2 or 3 years even if the underpayment has been ongoing for longer. FLSA normally provides double damages (liquidated damages equal to the unpaid wages) for violations; the Portal-to-Portal Act allows courts to reduce or eliminate liquidated damages if the employer demonstrates it acted in good faith and had reasonable grounds to believe it was complying with the law. Employers who relied on written DOL guidance — opinion letters, administrative interpretations, regulations — are also protected from liability for actions taken in conformity with that guidance, even if the guidance later turns out to be wrong.

How It Affects You

If you work in a warehouse, factory, meat processing plant, pharmaceutical facility, or any job requiring pre-shift activities: Whether your employer must pay you for time spent donning equipment, going through security, or traveling between worksites is determined by the "integral and indispensable" test. Key examples: putting on specialized safety gear that is required to do your job safely (a hazmat suit, sterile gowning in a cleanroom, a hard hat and harness for roofing) — compensable, because the gear is integral to performing the work. Changing into a generic uniform that isn't specific to your job's hazards — generally not compensable. Post-shift security screenings at an Amazon warehouse — not compensable (Integrity Staffing Solutions v. Busk, 2014, the Supreme Court held that security screening wasn't integral to picking and packing). Traveling between job sites during the workday — compensable (part of the continuous workday, not commuting). If you believe you're being denied pay for compensable pre- or post-shift activities, document the time carefully and file a complaint with the DOL Wage and Hour Division. The statute of limitations is 2 years (3 years for willful violations), and each underpaid paycheck is a separate violation, so recent underpayments are still actionable even if the practice has been ongoing for years.

If you're an employer in a warehouse, distribution, manufacturing, or food processing operation: The Portal-to-Portal Act's exclusions are not a blanket exemption — they require a fact-specific analysis of each pre- and post-shift activity. The continuous workday rule is particularly important: once an employee performs the first compensable principal activity, the continuous workday has begun and all subsequent time (including walking between stations, waiting for materials, and short breaks) is compensable until the last principal activity ends. This means that if donning safety equipment is compensable and begins at 6:45 AM, the 15 minutes of walking to the production floor counts as paid time even if production starts at 7:00. Review your specific pre- and post-shift activities against DOL's interpretive guidance at 29 CFR Part 790. When in doubt, request a DOL opinion letter — the Wage and Hour Division has restarted its opinion letter process, and reliance on a written DOL opinion letter is an explicit statutory defense against FLSA liability (29 U.S.C. § 259), even if the agency later changes its interpretation.

If you're an hourly worker with a potential FLSA claim for back pay: The Portal-to-Portal Act's 2-year statute of limitations (3 years for willful violations) determines how far back your claim can reach. If your employer knew it was underpaying you for compensable time but did it anyway, argue for the 3-year window — courts look at whether the employer showed "reckless disregard" for FLSA compliance as evidence of willfulness, not just intentional violation. Each paycheck is a separate violation, so the window rolls forward continuously. FLSA back pay claims are valuable: you recover the unpaid wages plus liquidated damages equal to 100% of the back pay unless the employer proves it acted in good faith with reasonable grounds for believing its practice was lawful. That means a $10,000 underpayment becomes $20,000 in total recovery. Many FLSA plaintiff attorneys take these cases on contingency, and if you win, your employer pays your attorney's fees under the FLSA's fee-shifting provision.

If you work in gig economy logistics, app-based delivery, or remote worksite arrangements: Portal-to-Portal questions are multiplying in the gig economy, but with a threshold complication: the Act only applies to employees, not independent contractors. Before the integral-and-indispensable test even applies, there's a prior question — whether you're an employee at all under the FLSA's economic reality test. If platforms like Amazon Flex, DoorDash, or Instacart classify you as an independent contractor, the Portal-to-Portal Act's compensable time rules and the FLSA's overtime requirements don't apply to your relationship with them — see worker classification rules for how that threshold question is decided. California's AB5 and similar state laws have challenged contractor classification more aggressively than federal law. If you are an employee (or believe you've been misclassified), the travel-between-worksites rules become relevant: driving from your home to your first delivery stop of the day is generally not compensable (commuting), but driving between delivery stops during your shift is compensable travel between worksites.

State Variations

The Portal-to-Portal Act modifies federal FLSA, but state laws may differ:

• Some states (California, notably) have broader definitions of compensable time that override the Portal-to-Portal Act's exclusions for state law claims
• State statutes of limitations for wage claims may be longer than the federal 2/3-year period
• State laws may not allow the good-faith liquidated damages reduction available under federal law
• Workers may bring both federal FLSA and state wage claims, with the more worker-friendly law applying to each element

Implementing Regulations

• 29 CFR Part 790 — General Statement as to the Effect of the Portal-to-Portal Act on the FLSA: the DOL's authoritative interpretive statement explaining how the Portal-to-Portal Act modifies what counts as compensable work time; issued as a regulation to bind DOL enforcement positions. Key provisions:

  • §§ 790.10–790.12 — When preliminary/postliminary activities ARE compensable: the Portal-to-Portal Act excludes preliminary and postliminary activities from compensable time UNLESS those activities are made compensable by: (a) an express provision of a written or nonwritten contract in effect at the time of the activity; or (b) a custom or practice in effect at the place of employment at the time of the activity; § 790.12 clarifies that a contract, custom, or practice makes a preliminary/postliminary activity compensable only for the "portion of the day" covered by that agreement — it doesn't automatically extend compensability to the whole workday; this means if a union contract specifies that employees are paid from when they reach the work floor (not the parking lot), that contract provision controls even if it differs from an employer's interpretation
  • §§ 790.13–790.16 — The Good Faith Defense (the Act's employer protection): the Portal-to-Portal Act also created a defense for employers who acted in good faith reliance on administrative guidance; if an employer can show that: (1) their acts or omissions were in conformity with an administrative regulation, order, ruling, or interpretation from the Administrator of WHD; and (2) they acted in good faith relying on that guidance; and (3) they acted in reliance on it — then they are protected from liability for retroactive wage claims and from liquidated damages; this defense was crucial in 1947 when back-pay suits were flooding courts, but it remains relevant when WHD changes its interpretation of what constitutes work time
  • § 790.17–790.18 — "Administrative regulation, order, ruling, or interpretation": the good faith defense requires reliance on an official WHD issuance — regulations, official letters, interpretive bulletins, and enforcement policies all qualify; informal guidance from a local WHD office, court decisions, or an employer's own interpretation of the statute do NOT qualify as the kind of administrative guidance that supports the defense; this limitation means employers cannot simply rely on their own reading of the law to establish the defense — they need to point to a specific WHD statement they relied upon

  Part 790 is technically an interpretive rule rather than a legislative rule — it represents DOL's official view of what the Portal Act means without creating new legal obligations. Courts give substantial deference to Part 790's interpretations in FLSA litigation, though the Skidmore standard (reasonable weight based on the thoroughness of reasoning) rather than Chevron deference applies to interpretive statements. The most practically significant legacy of Part 790 is the articulation of when a custom or practice makes otherwise excluded activities compensable — the "custom or practice" concept has been litigated extensively in the context of donning and doffing protective gear (putting on and taking off safety equipment required for the job), a context where the Supreme Court ruled in Integrity Staffing Solutions v. Busk (2014) that security screening at an Amazon warehouse was not compensable because it was "postliminary" to the principal activity of picking and packing orders.

• 29 CFR 785.34–.41 — DOL hours worked regulations affected by Portal-to-Portal Act (travel time, sleeping time, waiting time, on-call time as affected by the Act)

Pending Legislation

No standalone Portal-to-Portal Act reform bills have been introduced in the 119th Congress. Wage and hour provisions appear in broader labor legislation — see Federal Minimum Wage and Davis-Bacon Prevailing Wage.

Recent Developments

The Supreme Court's decision in Integrity Staffing Solutions v. Busk (2014) clarified that post-shift security screenings are not compensable — a major ruling for warehouse and retail employers. Lower courts continue to litigate the integral-and-indispensable test for various pre- and post-shift activities. DOL's opinion letter process (restarted in 2017 after a period of withdrawals) provides employers with written guidance they can rely on under § 259. The growing gig economy has raised novel Portal-to-Portal questions about when app-based workers' compensable time begins and ends — a question complicated by the preliminary classification issue of whether gig workers are employees at all.