IRS Statute of Limitations: EA Exam Part 3 Guide (2026)

The IRS statute of limitations runs on three clocks. The IRS generally has 3 years from filing to assess more tax and 10 years from assessment to collect it, and you have the later of 3 years from filing or 2 years from payment to claim a refund. Part 3 questions test which clock applies and when it starts.

Part 3 of the Special Enrollment Examination (SEE) builds these questions around filing, assessment, and payment dates. This guide from VantageEA, an Enrolled Agent (EA) exam practice platform, covers each clock, its exceptions, the events that pause it, and the common traps.

What are the three statute of limitations clocks on Part 3?

The assessment statute limits how long the IRS has to assess more tax, the collection statute limits how long it has to collect an assessed balance, and the refund statute limits how long you have to claim money back. Each one starts on a different date:

Before you answer any statute question, find the date that starts the clock.

When does the 3-year assessment clock start?

The assessment period runs 3 years from the date the return was filed. A return filed before its due date is treated as filed on the due date, and a late return starts the clock on the day it is actually filed.

For a 2025 Form 1040 due April 15, 2026, the assessment statute expiration date (ASED) falls like this:

• Filed early on February 20, 2026: treated as filed April 15, 2026, so the ASED is April 15, 2029.
• Filed on extension on October 9, 2026: the ASED is October 9, 2029.
• Filed late with no extension on June 1, 2027: the ASED is June 1, 2030.

A substitute for return that the IRS prepares for a nonfiler does not start the clock, and an amended return does not restart it. The statute of limitations on assessment topic page drills these start dates. Filing early gives the taxpayer no head start, because the IRS counts from the due date.

When does the IRS get 6 years, or unlimited time, to assess?

The period stretches to 6 years when a taxpayer omits gross income that is more than 25% of the gross income stated on the return. There is no time limit when the return is false or fraudulent with intent to evade tax, when the taxpayer willfully attempts to evade tax, or when no return is filed.

For a business, gross income on the return means gross receipts before subtracting cost of goods sold. Consider a retailer who reports $200,000 of receipts and $120,000 of cost of goods sold, then leaves out $40,000 of sales:

• Correct test: 25% of $200,000 is $50,000. The $40,000 omission is below that, so the 3-year period still applies.
• Common error: measuring against the $80,000 gross profit gives a $20,000 threshold and a wrong 6-year answer.

The IRS guidance on how long to keep records uses the same periods: 6 years for a 25% omission, and indefinitely for a fraudulent return or no return. Fraud removes the deadline to assess, and the 10-year collection clock still applies once the tax is assessed.

Can the assessment period be extended or paused?

Yes. The taxpayer and the IRS can agree in writing to extend it, and some IRS actions suspend it automatically. Any extension must be signed before the current period expires.

• Form 872: extends the assessment period to a fixed date.
• Form 872-A: an open-ended extension that ends 90 days after the IRS receives Form 872-T from the taxpayer or mails one to the taxpayer.
• Notice of deficiency: mailing it suspends the period during the 90 days (150 if addressed outside the US) to petition the Tax Court and through any Tax Court case until the decision is final, plus 60 days.
• Amended return near the deadline: if the IRS receives an amended return showing more tax within the last 60 days of the period, it has 60 days from receipt to assess that amount.

The IRS must tell the taxpayer about the right to refuse an extension or limit it to specific issues. A representative named on Form 2848 can sign the consent (see the Form 2848 vs Form 8821 guide), and the notice of deficiency and Tax Court topic covers the 90-day letter. A consent signed after the ASED has no effect.

How long do you have to claim a refund?

A refund claim must be filed within 3 years from the date the original return was filed or 2 years from the date the tax was paid, whichever is later. A second rule, the lookback period, then caps the amount:

• Claim filed within the 3-year period: the refund is limited to tax paid in the 3 years before the claim, plus any extension of time to file.
• Claim filed under the 2-year rule: the refund is limited to tax paid in the 2 years before the claim.
• Withholding and estimated tax: treated as paid on the original due date of the return, without extensions.

The lookback trips up late filers. A taxpayer with $3,800 withheld in 2023 never filed the 2023 return, due April 15, 2024, so the withholding counts as paid on that date. A late return filed by April 15, 2027 recovers the full $3,800. Filed on May 3, 2027, it recovers nothing, because the payment falls outside the 3-year lookback even though the claim itself is timely. IRS Publication 556, Examination of Returns, Appeal Rights, and Claims for Refund, explains these limits, and the refund claims and statute topic turns them into drills. A timely claim can still produce a zero refund when the payments are too old.

What refund claims get more than 3 years?

Publication 556 lists special refund periods for a few items, each measured from the due date of the return for the year involved:

For individuals, the refund period is also suspended during a financial disability: a medically determinable impairment, lasting or expected to last at least 12 months or to result in death, that prevents the taxpayer from managing financial affairs. No suspension applies for any period when a spouse or guardian was authorized to act. The 7-year clock starts at the due date for the year the security became worthless, often years before anyone notices.

How long does the IRS have to collect after it assesses tax?

The IRS generally has 10 years from the date of assessment to collect, a deadline called the collection statute expiration date (CSED). The clock starts when the IRS formally records the liability, which is later than the date the return was filed.

Each assessment has its own CSED. Suppose the tax shown on a 2023 return is assessed on May 20, 2024, and an audit adds more tax that is assessed on October 6, 2026:

• Original balance: CSED of May 20, 2034.
• Audit balance: its own CSED of October 6, 2036.

Collection after the CSED is possible only in narrow cases, such as a court judgment obtained before it expires or an extension tied to an installment agreement. The Internal Revenue Manual section on collection statute expiration (IRM 5.1.19) explains how the IRS computes the date. Count collection years from the assessment date, never from the filing date.

What pauses the 10-year collection clock?

These events suspend the CSED and push the expiration date later by the length of the pause:

• Offer in compromise: suspended while the offer is pending, for 30 days after a rejection, and during a timely appeal.
• Installment agreement request: suspended while the request is pending, for 30 days after a rejection or termination, and during a timely appeal.
• Collection Due Process hearing: suspended from a timely hearing request until the determination is final.
• Bankruptcy: suspended during the automatic stay, plus 6 months.
• Absence from the US: suspended while the taxpayer is outside the United States for a continuous period of at least 6 months.
• Innocent spouse request: suspended for the requesting spouse while collection is barred, plus 60 days.

The CSED keeps running once an installment agreement is approved and payments begin, and while an account is in currently not collectible status. The offer in compromise topic page covers how offers affect the CSED. Currently not collectible status stops collection activity while the 10-year clock keeps running.

What statute of limitations traps show up on Part 3?

Part 3 (Representation) had a pass rate of 70% in the 2024-2025 testing year, according to figures compiled from Prometric score data (the IRS does not publish official pass rates). Statute questions cost points when candidates apply the right period to the wrong date:

• Mixing assessment and collection: fraud removes the assessment deadline, and collection still ends 10 years after assessment.
• Using gross profit in the 25% test: business gross income means receipts before cost of goods sold.
• Assuming an amended return restarts the clock: it does not, apart from the 60-day rule for additional tax shown near the deadline.

Try this one. A client's CSED is June 30, 2030. On March 2, 2027 the client requests an installment agreement, and the IRS rejects it on April 1, 2027, with no appeal. The CSED is suspended for the 30 days the request was pending plus 30 days after the rejection, so it moves about 60 days later, to late August 2030. For a wider view of the part, read how hard each EA exam part is and the EA Part 3 representation exam overview.

How should you study the statute of limitations for the 2026 EA exam?

Each part of the SEE has 100 questions (85 scored and 15 experimental) in 3.5 hours, and you need a scaled score of 500 on the 200 to 800 scale to pass. According to the IRS Enrolled Agents FAQ, the US window runs July 1, 2026 to February 28, 2027 at PSI test centers or through PSI online proctoring, and the fee is $317 per part.

1. Build one sheet with three rows: for each clock, write what starts it, how long it runs, and what extends or pauses it.
2. Write out actual dates: turn every practice question into a start date and an end date before you pick an answer.
3. Answer timed questions and sort every miss by the clock it tested.

The guide to EA exam numbers to memorize for 2026 puts these periods beside other Part 3 deadlines, and the week-by-week EA exam study schedule covers them in the first two weeks of Part 3. VantageEA EA mock tests report your number correct out of 100, with 70 correct as the pass mark, plus an estimated PSI score range. Start with a free EA practice test.

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