Innocent Spouse Relief: A Practitioner's Guide to Section 6015

Most tax professionals run into innocent spouse relief the same way: a client brings in a notice of deficiency or a levy notice for a year they filed jointly, and the income or deduction that caused the problem belonged to their spouse or ex-spouse. Sometimes it's caused by an unreported side business, or it may be from a retirement distribution the client never saw. Either way, the IRS can collect the full amount from either person who signed that return.

Innocent spouse relief is the main remedy, but the name doesn’t tell the full story. Section 6015 of the Internal Revenue Code contains three separate types of relief, each with its own eligibility test, deadline, and refund rules. A fourth provision, Section 66, covers some married taxpayers in community property states who didn't file jointly. Getting the framing right at intake and building the record early often decides the case before the IRS ever looks at it.

This guide walks through how each type of relief works, where the deadlines trip people up, how the IRS and the Tax Court review requests, and what to watch for when you take one of these cases on.

Why Joint Filers Are Liable in the First Place

When spouses file a joint return, Section 6013(d)(3) makes each of them jointly liable for the entire tax. That covers the tax shown on the return and any deficiency the IRS later assesses, along with penalties and interest.

This doesn’t change, even in the event of a divorce. A decree that assigns the tax debt to one spouse is enforceable between the former spouses, but it doesn't bind the IRS, which can still collect from either person. Clients are often surprised by this, and it's one of the first things worth explaining in a consultation. The decree does still carry weight inside an equitable relief claim, which comes up below.

The Three Types of Innocent Spouse Relief 

The IRS considers all three types whenever a taxpayer files Form 8857, Request for Innocent Spouse Relief, so the client doesn't have to pick one. You still need to know which one the facts actually support, because that shapes the evidence you gather.

Traditional Innocent Spouse Relief under Section 6015(b)

This is the original form of relief, and it has the tightest requirements. According to IRS Publication 971, the requesting spouse must show all of the following:

• Joint return: A joint return was filed for the year at issue.
• Understatement: There is an understated tax caused by erroneous items of the other spouse, meaning unreported income or an improper deduction, credit, or basis.
• No knowledge: When the requesting spouse signed the return, they didn't know and had no reason to know of the understatement.
• Inequity: Taking all facts and circumstances into account, it would be unfair to hold them liable.

The "reason to know" standard is often a central issue. The IRS looks at the size of the item relative to the household's finances, the requesting spouse's education and business experience, how involved they were in the activity that produced the item, whether they asked about anything a reasonable person would have questioned, and whether the item broke from a pattern in prior returns. A client with an accounting background who handled the household books will have a harder time here than one who was kept away from the finances.

Partial relief is possible. If the client knew about part of an item but not the rest, relief can apply to the unknown portion. Pub. 971 gives the example of a spouse who knew about $5,000 of gambling winnings but had no way to know the real figure was $25,000. Relief can cover the tax on the $20,000 they didn't know about.

On the inequity prong, the main question is whether the requesting spouse received a significant benefit from the understatement, which means anything beyond normal support. Desertion, divorce, and separation also weigh in.

Separation of Liability under Section 6015(c)

Separation of liability works differently. Instead of wiping out the liability, it allocates the deficiency between the spouses roughly as if they had filed separate returns, and the requesting spouse is responsible only for their share.

The threshold is marital status at the time Form 8857 is filed. The requesting spouse must be divorced, legally separated, or widowed, or must not have been a member of the same household as the other spouse at any point during the 12 months before filing. Spouses who live apart but aren't estranged, or where one is temporarily away (for work, military service, or incarceration, for example), are still treated as members of the same household.

Two features make 6015(c) attractive when a client qualifies:

• Burden of proof: The IRS, not the taxpayer, has to prove the requesting spouse had actual knowledge of the erroneous item when they signed the return.
• Actual knowledge only: "Reason to know" is irrelevant here. The regulations say actual knowledge can't be inferred just because the spouse should have known.

Actual knowledge still sinks plenty of claims. For unreported income, it means knowing the income was received, even without knowing it was taxable. For a deduction, it means knowing the facts that made it unallowable. A 2026 Tax Court summary opinion, Anderson v. Commissioner (T.C. Summ. Op. 2026-6), found that a requesting spouse lacked actual knowledge where a deduction was disallowed only because the other spouse failed to substantiate it during the audit, and the expense had in fact been paid. Summary opinions aren't precedential, but the reasoning is useful to know for substantiation-driven deficiencies.

There are two more limits. If the spouses transferred assets as part of a fraudulent scheme, relief is off the table. And if the other spouse transferred property to the requesting spouse mainly to avoid tax, the requesting spouse's allocated share goes up by the value of that property. 

A transfer is presumed to have tax avoidance as its principal purpose if made after the date one year before the IRS mails its first proposed-deficiency letter affording an opportunity for administrative review in Appeals. The presumption therefore also reaches transfers after that letter. It does not apply to specified divorce or separate-maintenance transfers, and the requesting spouse may rebut it by establishing a different principal purpose. The increase is based on fair market value at transfer and cannot exceed the deficiency.

One more thing to tell clients up front: separation of liability relief doesn't produce refunds. If they've already paid, 6015(c) won't get that money back.

Equitable Relief under Section 6015(f)

Equitable relief is available only when the client doesn't qualify under 6015(b) or (c), but it reaches something the other two can't: underpayments. If the return was correct and the tax simply wasn't paid, because the other spouse said they'd handle it and didn't, equitable relief is the only path under Section 6015.

The IRS applies the framework in Revenue Procedure 2013-34. First, the requesting spouse has to meet seven threshold conditions. These include: 

• Filing a joint return
• Filing a timely claim
• No fraudulent transfers between the spouses
• No knowing participation in a fraudulent return
• Liability that is attributable to the other spouse. 

That last condition has exceptions, including items attributable to the requesting spouse only because of community property law, misappropriated funds that were meant for paying the tax, prior abuse, and fraud by the other spouse.

Next, the IRS checks whether the case qualifies for a streamlined determination. For streamlined equitable relief, the requesting spouse must satisfy the marital-status definition in Rev. Proc. 2013-34, § 4.03(2)(a), as of the IRS’s determination. This includes divorce, legal separation, certain widowhood situations, or not having shared a household at any time during the preceding 12 months. 

Abuse or financial control can satisfy the knowledge element.

If the case doesn't fit the streamlined path, the IRS weighs the factors in Section 4.03:

• Marital status: Favors relief if the spouses are no longer married; otherwise neutral.
• Economic hardship: Favors relief if paying would leave the requesting spouse unable to cover reasonable basic living expenses; otherwise neutral.
• Knowledge or reason to know: For underpayments, the question is whether the requesting spouse reasonably expected the other spouse to pay. A timely installment agreement request can create a presumption of that expectation.
• Legal obligation: Favors relief if a divorce decree or binding agreement assigns the liability solely to the other spouse.
• Significant benefit: Weighs against relief if the requesting spouse enjoyed a lifestyle beyond normal support because of the unpaid tax.
• Compliance: Favors relief if the requesting spouse has stayed compliant in later years.
• Mental or physical health: Favors relief if the requesting spouse was in poor health when the return was filed or when relief was requested.

No single factor controls, and the list isn't exhaustive, but remember that actual knowledge isn't weighed more heavily than any other factor, which was a deliberate change from earlier guidance; and abuse or financial control by the other spouse can flip factors that would otherwise count against relief, including knowledge and significant benefit. Rev. Proc. 2013-34 defines abuse broadly, covering psychological and emotional abuse and efforts to control, isolate, or intimidate.

Pay Attention to Deadlines for Innocent Spouse Relief

For 6015(b) and (c), Form 8857 must be filed no later than two years after the IRS's first collection activity against the requesting spouse. That deadline is statutory, and missing it permanently closes both paths for that year.

The trick is knowing what counts as "collection activity." Pub. 971 lists the most common triggers:

• Refund offset: An offset of the requesting spouse's refund against the joint liability, if the IRS also notified them of their right to request relief.
• Section 6330 notice: A notice of intent to levy and right to a Collection Due Process hearing, usually Letter 11 or Letter 1058.
• Lawsuit: A suit by the United States against the requesting spouse to collect the joint liability.
• Court claim: A claim filed in a court proceeding involving the requesting spouse or their property, including a proof of claim in bankruptcy.

A notice of deficiency or a bill doesn't start the clock on its own. Refund offsets cause the most trouble, because a client may not connect an offset from years ago with a liability they're only now trying to fight. In a 2024 bench opinion (Gomez), the Tax Court found 6015(b) and (c) claims untimely because the requesting spouse filed more than two years after a 2018 offset. Pull account transcripts for every year involved before you assume the client still has time.

Equitable relief has a much longer window. The IRS previously applied a regulatory two-year filing deadline to 605(f) requests. Although the court of appeals that had addressed the issue upheld that deadline, Treasury and the IRS eliminated it administratively in Notice 2011-70, in 2011. Congress subsequently codified the current collection and refund period framework in the Taxpayer First Act of 2019. 

A request for equitable relief is timely if it's filed within the period the IRS has to collect the tax under Section 6502 (generally 10 years from assessment) or, for a refund, within the refund limitation period under Section 6511. If a client wants both relief from a balance and a refund of past payments, each part follows its own clock.

For traditional relief under § 66(c), Form 8857 generally must be filed no later than six months before the assessment limitations period, including extensions, expires against the nonrequesting spouse. If the IRS begins examining the requesting spouse’s return during that six-month period, the deadline is 30 days after the IRS’s initial contact letter. Requests for equitable relief under § 66(c) follow the collection- and refund-limitations framework applicable to equitable relief.

File early, even if the file is incomplete. Pub. 971 itself tells taxpayers not to wait until they have all their documentation. You can supplement the file afterward.

What Happens After Form 8857 Is Filed?

Once the IRS receives Form 8857, collection against the requesting spouse for those years is generally suspended while the request is pending, including any time in Tax Court. Interest and penalties keep accruing, and the collection statute is extended by the time the request was pending plus 60 days. One form can cover up to six tax years; more years need a second form.

The IRS is required by law to notify the non-requesting spouse and give them a chance to participate. There's no exception for abuse cases. The IRS won't disclose the requesting spouse's current address, phone number, employer, income, or assets, but other information in the file can be shared. Clients with safety concerns should redact personal details from anything they submit, and it's worth walking them through this before they file rather than after.

The IRS issues a preliminary determination, which the requesting spouse can appeal to the IRS Independent Office of Appeals, followed by a final determination letter. The requesting spouse then has 90 days from the mailing of that letter to petition the Tax Court. If the IRS hasn't issued a final determination within six months of the filing date, the taxpayer can petition without waiting. The non-requesting spouse can intervene in the Tax Court case and argue against relief, and some do.

Build the Record at the Administrative Level

This is the step that’s hardest to fix later. Since the Taxpayer First Act, Section 6015(e)(7) limits the Tax Court's review to the administrative record plus newly discovered or previously unavailable evidence. The standard of review is de novo, but the court is generally working from what the IRS had in front of it.

That means the Form 8857 submission and any follow-up should be treated like a trial record. Include a detailed narrative of the marriage's finances, who controlled the accounts, how the return was prepared and signed, and what the requesting spouse knew at signing. Attach bank statements, the divorce decree or separation agreement, evidence of the household's spending, and documentation of any abuse (protective orders, police reports, medical records, or statements from third parties). Complete the financial information in Part IV of Form 8857 carefully, because that's what the IRS uses to evaluate economic hardship.

The Tax Court's 2025 memorandum opinion in Sample v. Commissioner (T.C. Memo. 2025-118) is a good illustration. The case was decided on a stipulated administrative record, and the requesting spouse's significant assets undercut her economic hardship argument under 6015(f).

Refunds for Innocent Spouse Relief (and Their Limits)

Refunds are available under 6015(b) and (f) but not under 6015(c). Even when they're available, they're narrow. The IRS refunds only payments the requesting spouse made with their own funds, and the client has to prove it (bank statements or canceled checks, for example). Withholding and estimated payments are treated as made with the joint return, so they generally can't be refunded. A refund from another year that the IRS offset against the joint liability can count, to the extent it represents the requesting spouse's share. The standard refund lookback periods under Section 6511 also apply.

Situations Similar to Innocent Spouse Relief

Injured Spouse

When a joint refund is offset against one spouse's separate debt (past-due child support, a student loan, a prior tax debt), the other spouse uses Form 8379, Injured Spouse Allocation. 

Duress

If the client signed the return under threat of harm or other coercion, there's no valid joint return at all. They aren't liable for the tax on it, though they may need to file a separate return for that year.

Separate Returns in Community Property States

Married taxpayers in Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, or Wisconsin who filed separately can still be taxed on their share of community income. Section 66 provides relief here, and it's also requested on Form 8857.

Prior Agreements and Court Decisions

A requesting spouse generally cannot obtain relief from liabilities covered by an accepted offer in compromise to which that spouse is a party or by a closing agreement disposing of those liabilities. An issue-specific closing agreement does not necessarily bar relief for other items, and special TEFRA rules may apply. Prior final court decisions can also preclude relief under § 6015(g)(2), depending on whether relief was previously at issue or the requesting spouse meaningfully participated in the earlier proceeding.

Practice Notes for Tax Professionals

Intake matters more in these cases than in most. A few questions that tend to surface the facts you need: Who prepared the return, and who gathered the documents? Did the client have access to the accounts and the mail? Were there large purchases or trips in the year at issue? Has the client received any refund offsets or levy notices? Is there a divorce decree, and what does it say about taxes? Was there any history of abuse or financial control?

Watch for conflicts. If you prepared the joint return in question, or you represent or previously represented both spouses, a request for relief puts their interests directly against each other. Circular 230 Section 10.29 requires you to identify a conflict of interest and, where representation can continue, obtain informed written consent. In many cases the cleaner choice is to refer the requesting spouse elsewhere. Your firm's own policies and professional liability carrier may have something to say about this too.

Finally, a word on where the guidance stands. Treasury and the IRS proposed updated Section 6015 regulations in 2013 and 2015, but withdrew both sets on December 15, 2025, saying they'd offer a new comment period if they revisit the topic. That leaves the 2002 final regulations, Rev. Proc. 2013-34, and the statute (as amended by the Taxpayer First Act) as the working framework. Where the 2002 regulations conflict with later statutory changes, such as the old two-year rule for equitable relief, the statute controls.

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Frequently Asked Questions About Innocent Spouse Relief

Does the client have to be divorced to get innocent spouse relief? No. Divorce, legal separation, or 12 months living in separate households is required only for separation of liability under 6015(c). Relief under 6015(b) and (f) is available to taxpayers who are still married, although marital status is one of the factors for equitable relief.

Can a client get relief from tax that was reported correctly but never paid? Yes, but only through equitable relief under 6015(f). Innocent spouse relief and separation of liability apply only to understatements.

What if the two-year deadline has passed? The 6015(b) and (c) paths are closed for that year, but equitable relief may still be available as long as the collection or refund statute is open.

Will the IRS tell the former spouse about the request? Yes. The IRS must notify the nonrequesting spouse and let them participate. It won't disclose the requesting spouse's personal contact or financial details, but other information in the file can be shared.

Can relief be requested during an audit? Yes. A request can be filed while an examination is underway. Pub. 971 directs taxpayers to send Form 8857 to the addresses in the form instructions rather than to the examining agent.