IRS Controversy · Brief · Working level
Form 872 statute extensions: when to consent, and on what terms
The IRS routinely asks taxpayers to extend the three-year assessment statute during exams. Consent is voluntary and negotiable — fixed-date versus open-ended Form 872-A, restricted consents limited to specific issues, and the Appeals-access trade-off.
Near the end of most substantive exams comes a request to sign Form 872, extending the three-year assessment statute of limitations under Section 6501. The consent is genuinely voluntary — Section 6501(c)(4)(B) requires the IRS to say so each time — but the choice is rarely between extending and winning by the clock. Refuse, and the exam team protects the statute the only way it can: a statutory notice of deficiency asserting every open adjustment, which forfeits the Appeals conference and puts the taxpayer in Tax Court on the government's draft of the facts. The real decision is not whether time costs something, but how much time to give and on what terms — and the terms are negotiable far more often than taxpayers ask.
Why the IRS asks, and why taxpayers usually agree
An exam that will not finish — or a case headed to Appeals — needs statute room. Appeals will not ordinarily take a non-docketed case with fewer than roughly 365 days remaining on the statute, and will return cases that arrive shorter. So a taxpayer who wants the Appeals path described in the Appeals process overview — where most cases settle on hazards of litigation — is usually buying that opportunity with the extension. Refusal makes sense mainly when the taxpayer affirmatively prefers immediate Tax Court jurisdiction (docketed cases still typically reach Appeals settlement officers anyway) or when the IRS's request is a substitute for an exam it never diligently pursued. The forum mechanics of that choice are covered in Tax Court versus the refund forum.
The instruments
The three consent forms allocate control over the clock very differently.
| Form | Structure | Ends when | Risk profile |
|---|---|---|---|
| 872 | Fixed date | The stated date (absent a new consent) | Taxpayer keeps timeline leverage; IRS may return for more |
| 872-A | Open-ended | 90 days after Form 872-T from either party, or a deficiency notice | Years can stay open indefinitely; interest accrues throughout |
| Restricted consent (872 with restrictive language) | Fixed date, named issues only | Stated date, for listed issues; original CSED for all else | Precision of the restriction language is everything |
Three negotiating points recur. Length: examiners often propose a year or more by default; six to nine months frequently suffices for a closing exam, and shorter extensions keep pressure on the IRS to finish while remaining renewable. Form 872 over 872-A: the open-ended consent removes the periodic renegotiation points at which a taxpayer can reassess — and since interest under Section 6601 runs the whole time, an 872-A left unterminated on a losing issue is an expensive oversight. If one is in place, terminating via Form 872-T starts a 90-day fuse within which the IRS must issue any deficiency notice. Restriction: once an exam has conceded or closed most issues — say everything but the research credit sample dispute in an exam like those described in R&D credit audit defense — a restricted consent lets the statute lapse for all other adjustments while preserving the live issue for Appeals. The IRS's pattern restriction language should be reviewed word by word; ambiguity is construed against reopening, but litigating what a consent covered is a poor use of anyone's time.
Traps and edge cases
- Authority. A consent signed by someone without authority (wrong officer, unauthorized representative, defective power of attorney) is void — occasionally a taxpayer windfall, more often an IRS-side check that delays execution. Confirm the Form 2848 covers the years and the act.
- The extension extends refunds too. Under Section 6511(c), a timely consent also extends the period to claim refunds for the year until six months after the extended assessment date — so extending is not purely one-directional; affirmative claims stay open with it.
- Track every CSED independently. Multiple years, multiple consents, and pass-through entities (partnership years under the BBA regime run on the partnership's own clock) make statute charts genuinely easy to get wrong. The exam-file discipline discussed in IDR strategy and exam management should include a statute chart updated at every consent.
- Interest. Time is never free. Every month of extension on a losing issue is a month of deficiency interest; a taxpayer confident in the liability's outcome can stop the accrual with an advance remittance while the procedural fight continues.
Frequently asked questions
- Do you have to sign Form 872 when the IRS asks?
- No. Consent to extend the assessment statute under Section 6501(c)(4) is voluntary, and the IRS must tell you so. But refusal has a predictable consequence: the exam team protects the statute by issuing a notice of deficiency on the current record — usually with every proposed adjustment intact — sending the dispute to Tax Court without an Appeals conference first.
- What is the difference between Form 872 and Form 872-A?
- Form 872 extends the assessment period to a fixed date, which can be extended again by further consents. Form 872-A is open-ended: it runs until 90 days after either party terminates it with Form 872-T or the IRS issues a deficiency notice. The fixed-date form preserves taxpayer control over the timeline; the open-ended form can quietly leave a year open for many years.
- What is a restricted consent?
- A statute extension limited to specifically described issues — for example, only the research credit — so the assessment period closes for everything else on the original schedule. The IRS accepts restricted consents when the remaining dispute is genuinely confined, typically later in an exam or at Appeals. The restriction language controls, so it must be drafted precisely.