What is IRS Form 872, and when are bond issuers asked to extend the direct-pay bond assessment period?

Direct-pay bond examinations rarely close inside the three-year assessment window. When one runs long on a Build America Bonds or other direct-pay issue, the IRS asks the issuer to extend the period on the affected Form 8038-CP credit by signing a Form 872-A. That request tends to reach you with the statute weeks from closing, before the examiner has finished.

If the clock runs out, the IRS loses authority to assess. Sign, and you extend the issuer's own exposure for longer. A loosely scoped consent may not protect what you assume it does, so what do you tell the issuer: sign, limit the consent, or refuse, and what does each choice cost?

Form 872, "Consent to Extend the Time to Assess Tax," is the written agreement under IRC §6501(c)(4) that moves the assessment date. For a Form 8038-CP return, the issuer, not a designated payee or conduit borrower, is the party who can extend it. Whether and how to sign is a judgment call, not an obligation.

This article covers what Form 872 is and its statutory basis, when a bond issuer is asked to sign, and the scope traps that decide whether the consent actually protects your position.

Key takeaways

• Form 872 extends the assessment period under IRC §6501(c)(4). It is a mutual written agreement, not a unilateral IRS act, and it covers only the tax and periods it names.
• The default clock is three years under IRC §6501, unless an exception applies. Absent a signed consent, the IRS generally loses authority to assess at three years after the relevant return is filed, though §6501 contains exceptions such as a false return, willful evasion, no return, listed transactions, certain foreign-reporting failures, and extension by agreement.
• The arbitrage trigger is IRC §148(f), not "Section 6208." No IRC §6208 governs arbitrage; the rebate requirement lives in §148(f), and the assessment period lives in §6501.
• Bond information returns are the Form 8038 series. Rebate and yield-reduction payments are made on Form 8038-T, which is the payment form rather than an information return.
• Scope must be read line by line. Do not assume penalties, additions to tax, interest, credit recapture, or consequential adjustments are covered because the consent uses broad tax language; confirm whether the form and any restrictive-consent attachment expressly include them, since a properly drafted attachment can.
• Signing is a decision, not a duty. The issuer can refuse, agree to a fixed-date Form 872, negotiate a restricted consent, or agree to an open-ended Form 872-A, and a consent keeps the exam open, which cuts both ways.

What is IRS Form 872?

Form 872 is the standard consent the IRS uses to extend the statute of limitations on assessment. Its authority is IRC §6501(c)(4), which permits the taxpayer and the Service to agree in writing, before the period expires, to a later assessment date. The governing procedures sit in IRM 25.6.22, "Extension of Assessment Statute of Limitations by Consent," revised August 7, 2025.

The general assessment period is three years under IRC §6501, unless an exception applies. Those exceptions include a false return, willful evasion, no return filed, listed transactions, certain foreign-reporting failures, and extension by agreement. Section 6501(c)(4) is the exception that lets both sides move the assessment date by agreement, and Form 872 is the instrument that records it.

Here the target query needs a plain correction. There is no IRC §6208 governing arbitrage. Arbitrage rebate for tax-exempt bonds is governed by IRC §148(f), and the period for assessing any resulting tax is governed by IRC §6501.

If you have seen "Section 6208" cited as arbitrage authority, treat it as an error and rely on §148(f) and §6501 instead.

Legacy TEFRA partnership consent forms are a separate regime and should not be confused with the Form 8038-CP direct-pay bond consent procedure.

How does a Form 872 consent extend the assessment period?

The clock starts when the relevant return is filed. But which Form 8038-series return you filed decides whether an assessment clock is even running against the issuer. Form 8038-CP, the return for direct-pay bonds such as Build America Bonds, is where the live assessment-statute issue arises, per IRM 8.7.8 and IRM 4.82.3, "Direct Pay Bonds."

For that return, the examiner treats the assessment period as three years from the date the return is filed. The normal §6501(b)(1) deemed-filing rules do not apply when the Form 8038-CP due date is not fixed by statute or regulation.

The consent protects the assessment period for affected Form 8038-CP credit claims. That means the refundable direct-pay bond credit under IRC §6431, which applies to pre-2018 direct-pay bonds such as Build America Bonds, since the §6431 credit was repealed for bonds issued after December 31, 2017. A direct-pay bond examination under IRM 4.82.3 may produce adjustments to those credit claims; the underlying issues can include arbitrage, rebate, or bond qualification.

The 8038 series splits into two functions, and the distinction matters. Form 8038, Form 8038-G, and Form 8038-GC are information returns, while Form 8038-T is the payment form for rebate and yield-reduction payments. Bond-qualification or arbitrage issues on those ordinary information returns are generally examined through Tax Exempt Bonds procedures and often resolved by closing agreement, rather than through the Form 8038-CP credit-assessment process discussed here.

Consider a dated example. An issuer files a Form 8038-CP for a 2021 direct-pay bond issue; because that return carries a live statute, the §6501 assessment window generally closes in 2024, three years after filing, unless a consent extends it. If a §148(f) arbitrage examination is still open as that date approaches, the consent is what keeps the assessment period alive.

Rebate liability accrues on its own schedule. Under IRC §148(f), the issuer computes rebate and pays it on Form 8038-T, and Treas. Reg. §1.148-3 sets the computation and payment-date rules: each installment is due within 60 days after its computation date, generally each fifth bond year, with a final payment within 60 days after the final computation date at retirement of the issue. The rebate computation and the assessment clock are separate tracks, and Form 872 touches only the second.

The form has variants, and choosing the right one is part of the job.

Other consent forms exist for specialized taxes. TEFRA partnership matters have their own forms, Form 872-P and Form 872-O, and IRM 25.6.22 lists the governing authorities for the family: IRC §6501(c)(4), §6229(b) (repealed post-2017), and §6901(d).

When is a bond issuer asked to sign Form 872 or Form 872-A?

A bond issuer is asked to sign when a direct-pay bond examination has affected Form 8038-CP returns whose assessment periods may expire before the IRS completes the examination, the Appeals process, or an agreed resolution. IRS guidance says examiners generally use Form 872-A for Form 8038-CP assessment extensions, with a fixed-date Form 872 as an alternative if the issuer requests it.

Per IRM 8.7.8 and IRM 4.82.3, Form 8038-CP is the direct-pay bond return that carries a live assessment statute. Absent a signed consent, the Service loses assessment authority three years after the return is filed, whether or not the exam has concluded.

Signing is a decision, not an obligation. Per the examiner practice in IRM 4.82.3, when the examiner asks, the issuer can refuse, agree to a fixed-date Form 872, negotiate a restricted consent that narrows the covered issues, or agree to an open-ended Form 872-A, depending on strategy and risk tolerance.

You weigh that choice when the exam or a closing-agreement negotiation cannot realistically finish before the three-year §6501 date and the issuer wants to preserve the ability to resolve the matter on the merits rather than force the Service's hand. The same statute-of-limitations discipline shows up across federal tax exposures, including the way the assessment clock behaves in this guide on avoiding penalties for late or incorrect payroll-tax filings.

What can go wrong when you sign a consent?

Scope is the first trap. Do not assume penalties, additions to tax, interest, credit recapture, or consequential adjustments are covered merely because the consent uses broad tax language; confirm whether the form and any restrictive-consent attachment expressly include them. A properly drafted restrictive-consent attachment in the direct-pay bond context may be drafted to expressly include related penalties and additions to tax.

As counsel at Kostelanetz noted in March 2026, boilerplate "federal income tax" language did not reach penalties, additions to tax, and interest in the Form 872-P and TEFRA context. Treat that analysis as an illustration of the scope principle, that a consent reaches only the tax and periods it names, rather than a blanket rule for every consent form.

Authority to sign is the second. For a Form 8038-CP return, IRM 4.82.3 makes the issuer the only party permitted to extend the assessment period, regardless of any designated payee, so confirm who can bind the issuer before execution. In a conduit financing, separately analyze whether borrower indemnity or cooperation covenants require the borrower to participate in the audit response, but do not treat the borrower as able to execute the federal limitations consent for the issuer's account.

The third is the decision itself. Signing keeps the exam open, which preserves the chance to resolve on the merits but also keeps the issuer exposed for longer; declining can force the Service to assess or drop the matter before the deadline. You weigh that trade-off per engagement, and the audit trail should show the reasoning, the form variant chosen, and the primary authorities relied on.

Why the consent you sign is only as good as its scope

A consent extends the §6501 assessment period only for the tax and periods it names, and on a Form 8038-CP direct-pay bond return the issuer is the party who can extend it. The scope of the consent, not its cover language, controls what you actually preserved. Read the form before you decide it protects you.

When a consent request lands, work through it in order:

1. Confirm which return carries the live statute, the Form 8038-CP, and how close the three-year date is.
2. Read the form's tax type, periods, and any restrictive-consent attachment to see exactly what is covered.
3. Verify who can bind the issuer: the issuer itself, not a designated payee or conduit borrower.
4. Weigh sign versus limit versus refuse against the exam and closing-agreement posture.
5. Document the reasoning, the form variant you chose, and the authorities you relied on.

Bizora is an AI tax research platform that pulls only from primary authorities, the IRC, Treasury Regulations, and IRS rulings, with a curated primary-source database and View Steps reasoning transparency that shows the citation path behind every answer. It is a supplemental tool that amplifies professional judgment, not a substitute for it. When the next consent request reaches you, you can research this topic in Bizora at bizora.ai.