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Exams · From the IRS manual

Amended returns, qualified amended returns and refund claims during an examination

Timing decides whether an amended return reduces penalties, and whether a refund claimed during an exam is protected. This page explains the qualified amended return rules in Treas. Reg. 1.6664-2(c), how examiners pick up amended returns filed mid-exam, the claim requirements and the LB&I 30-day window, and how the assessment and refund statutes interact with claims.

Updated October 25, 2026Sources Treas. Reg. 1.6664-2(c); IRC 6501(c)(7), 6511, 6532; IRM 4.10.11 (rev. 08-29-2025); IRM 4.46.3.7; IRM 4.19.13.4.1; IRM 25.6.1.9.4.2; Zellerbach Paper Co. v. Helvering, 293 U.S. 172 (1934); Badaracco v. Commissioner, 464 U.S. 386 (1984)
At a glance
QAR cutoffFirst IRS contact concerning any examination of the return
Penalty effectAdditional tax on a QAR counts as tax shown on the return
LB&I informal claimsWithin 30 calendar days of the opening conference
Refund suit after inactionPermitted if the IRS does not act within 6 months

Qualified amended returns

The accuracy-related penalty under IRC 6662 is computed on the underpayment, which is the correct tax less the tax shown on the return. Treas. Reg. 1.6664-2(c)(2) treats additional tax shown on a qualified amended return (QAR) as shown on the return, “except that such amount is not included if it relates to a fraudulent position on the original return.” Practically, a QAR that reports the full correction removes that amount from the underpayment, so there is no accuracy-related penalty on it. See the accuracy-related penalty.

Under Treas. Reg. 1.6664-2(c)(3), a QAR is an amended return, or a timely administrative adjustment request under IRC 6227 for a partnership, filed after the due date (with extensions) and before the earliest of the cutoff dates below. Under 1.6664-2(c)(4), an amended return filed only to make an adequate disclosure can also be a QAR even if it reports no additional tax.

The cutoff dates

Cutoff eventApplies to
“The date the taxpayer is first contacted by the Internal Revenue Service (IRS) concerning any examination (including a criminal investigation) with respect to the return”All returns
The date any person is first contacted about a promoter penalty exam under IRC 6700 for an activity the taxpayer claimed benefits fromTax shelter participants
The date a pass-through entity is first contacted in connection with an exam of the return the item relates toPass-through items
The date the IRS serves a John Doe summons under IRC 7609(f) covering the taxpayer's class and activityMembers of the summoned class
The date the IRS announces a settlement initiative for a listed transaction the taxpayer participated inListed transaction participants
For undisclosed listed transactions, also the first contact about a 6707(a) penalty exam of the advisor, or an IRS request for the advisor's 6112 listUndisclosed listed transactions

The first row is the one that matters in most practices. The trigger is the first contact concerning any examination of that return, which is normally the opening letter; once it arrives, an amended return for that year is no longer a QAR. For a partner or S corporation shareholder, contact with the entity about its return also closes the window for the pass-through items. The John Doe and promoter rows can close the window before the taxpayer hears anything.

What a QAR does and does not do

A QAR is a penalty tool. It does not stop an exam, and it does not affect the civil fraud penalty for a fraudulent original position. It does not extend the assessment statute: IRM 25.6.1.9.4.2 says “Filing an amended return doesn't usually extend the Assessment Statute Expiration Date (ASED),” with the IRC 6501(c)(7) exception that gives the IRS 60 days to assess additional income tax shown on an amended return received in the last 60 days before the ASED. The Supreme Court has twice refused to let an amended return move the clock. In Zellerbach Paper Co. v. Helvering, 293 U.S. 172 (1934), it held that an honest, sworn original return started the period even though a later law change made it inaccurate, and that a second return reporting additional tax is an amendment that “does not toll a limitation which has once begun to run.” In Badaracco v. Commissioner, 464 U.S. 386 (1984), taxpayers who had filed fraudulent returns later filed nonfraudulent amended returns and argued that the three-year period ran from the amendment; the Court held that IRC 6501(c)(1) allows assessment at any time where the original return was fraudulent, because “Nothing is present in the statute that can be construed to suspend its operation in the light of a fraudulent filer's subsequent repentant conduct.” The Court also observed that the Code “does not explicitly provide either for a taxpayer's filing, or for the Commissioner's acceptance, of an amended return”; the amended return is an administrative creation, which is why its penalty value depends entirely on the timing rules in the regulation rather than on any statutory right to correct a return. And for the six-year omission rule, an amended return filed after the due date is compared against the original return (or the last timely superseding return), so it does not erase an omission on the original (IRM 25.6.1.9.5.3).

Amended returns filed during an exam

After the exam starts, an amended return is not a QAR, but it is not useless. It puts the taxpayer's correction in writing, can be paired with payment to stop interest, and lets the examiner adopt the correction. Campus procedures in IRM 4.19.13.4.1 require the examiner to get it: “When research results show that a taxpayer has filed an amended return, the amended return must be requested to determine the impact on the examination.” The examiner pulls it from the processing function or files, or asks the taxpayer for a copy. In a field or office exam, give the amended return to the examiner directly rather than relying on routing; it may sit in processing otherwise.

If the amendment reduces tax, it is a claim and the examiner will consider it in the exam. If it increases tax, consider whether paying the additional amount now (and making an IRC 6603 deposit for other expected adjustments) is better than waiting for the report; Pub 3498 describes both.

Partnerships under the centralized audit regime cannot amend; they file an administrative adjustment request. See amended returns versus AARs.

Refund claims during an exam

IRM 4.10.11.2.1 lists what makes a formal claim: the required form and content, a request for refund of an overpayment, timely filing, and compliance with filing requirements such as signature under penalties of perjury. The content rules come from Treas. Reg. 301.6402-2(b)(1): each ground in detail, facts sufficient to apprise the IRS of the basis, the amount, and the tax type and period. An informal claim meets the substance but lacks a formality (for example, a signed letter with documents and a specific amount), and SB/SE examiners follow claim procedures for informal claims unless published guidance requires a formal claim.

The exam itself does not protect a refund the taxpayer has not claimed. The IRM note on affirmative issues says SB/SE examiners may consider them, but “Examiners should advise the taxpayer to file a valid claim for refund (before the RSED expires) if they want to protect their opportunity to recover a refund related to the affirmative issue.” If an unagreed case ends with a proposed refund, IRM 4.10.8.10.1 has examiners invite a claim in some cases (for example, overassessments over $100,000, or cases headed to Appeals with fewer than 180 days left to allow the overassessment) by adding language to the report. In agreed cases, a signed Form 4549 or Form 870 for an overassessment is itself treated as a valid claim.

Claims are priority work. IRM 4.10.11.2.3 notes: “If the IRS does not act on a claim for refund within six months from the filing date of the claim, the taxpayer is permitted to file a refund suit.” Disallowances must explain the reason under IRC 6402(l), and the taxpayer is generally offered Fast Track Settlement or an Appeals conference.

LB&I: the 30-day window

LB&I considers valid informal claims submitted within 30 calendar days of the opening conference (IRM 4.46.3.7.1.1). After the window, claims for issues not already under examination generally must be filed formally with the campus on Form 1120-X, 1040-X or 843, with a copy and support to the team; the territory manager decides whether to act on a late informal claim. The formal claim requirement can be waived for issues already under examination, Schedule K-1 items, Appeals case memoranda affecting the years, published guidance with territory manager concurrence, or other exceptions the territory manager grants. “BBA partnerships cannot submit claims after the 30-day window.” Agree a claims deadline in the examination plan; see LB&I examinations.

The statutes

Two rules work against taxpayers who wait. First, a claim does not hold the assessment period open, but it can be offset. IRM 4.10.11.5.1 says: “The filing of a claim for refund, request for abatement, or audit reconsideration does not extend the period of time for assessing an additional deficiency.” Yet IRM 25.6.22.2.1 notes that a claim amount “can be offset by additional taxes attributable to adjustments discovered through the re-examination process after the period for assessment has expired.” Filing a claim opens the year to review of other items, up to the amount of the claim, even if the IRS cannot assess more.

Second, the refund statute is its own clock. Under IRC 6511 and IRM 4.10.11.5.2, a claim must be filed within three years of the original return or two years of payment, whichever is later, and the amount is limited by a look-back from the claim date. The IDRS refund statute date can be misleading for returns filed during an extension; count from the actual filing date. A timely claim can be acted on after the refund statute expires. If the taxpayer signs a Form 872, IRC 6511(c) extends the refund period to match. See the assessment statute and refund claims and suits.

If the claim is disallowed

A disallowed claim gets a preliminary letter (Letter 569 in field exams) with Appeals rights, then a statutory notice of claim disallowance. IRC 6532 gives two years from the mailing of that notice, or from a signed Form 2297 waiving it, to sue in district court or the Court of Federal Claims. IRM 4.10.11.2.16 warns that the two years are not suspended while the IRS reconsiders the claim or Appeals considers it. Calendar the suit deadline the day the notice arrives.

Questions practitioners ask

My client got the audit letter yesterday. Can we still file a qualified amended return?

Not for that return. The QAR window closes on the date the taxpayer is first contacted concerning any examination of the return. An amended return can still help on interest and cooperation, but not on the accuracy-related penalty.

Does a QAR protect against the fraud penalty?

No. Additional tax on a QAR does not count as tax shown on the return if it relates to a fraudulent position on the original return.

Will the examiner see a 1040-X filed during the audit?

The campus procedure requires examiners to request amended returns they find. In practice, give a copy directly to the examiner.

Does filing a refund claim during the audit stop the assessment statute?

No. A claim does not extend the period to assess, but after the period expires the IRS can still offset the claim with adjustments it finds on re-examination.

How long does the client have to sue if the claim is denied?

Two years from the mailing of the statutory notice of claim disallowance under IRC 6532, not suspended by reconsideration or Appeals.