IRS Innocent Spouse Relief: Building a Case with Form 8857

When you filed a joint US tax return with a spouse or former spouse and the return understated tax (or you owe a joint balance you cannot pay), the IRS holds both spouses jointly and severally liable. That means the IRS can collect the entire amount from either spouse, regardless of who earned the income or who caused the error. Innocent spouse relief exists because that rule produces unfair results: when one spouse concealed income, inflated deductions, or otherwise caused the tax problem, the other spouse should not bear the liability. This page covers the three types of relief, what the IRS evaluates on Form 8857, how long it takes, and the complications for cross-border filers.

What creates the joint liability problem?

When married taxpayers file a joint return (Form 1040 with married filing jointly status), both spouses sign the return and both are jointly and severally liable for the entire tax, penalties, and interest. IRC 6013(d)(3). This is true even if:

• Only one spouse earned the income
• Only one spouse handled the finances and prepared the return
• The couple is now divorced and the divorce decree says one spouse is responsible for the tax debt
• One spouse did not read the return before signing

The IRS is not bound by divorce decrees. A divorce agreement that says “spouse A is responsible for all tax debts” is enforceable between the spouses in state court, but the IRS can still collect from spouse B. The IRS’s position is that both signatures on the joint return created joint liability, and a later agreement between the spouses does not change the IRS’s rights.

This creates a specific problem pattern: a couple files joint returns during the marriage, one spouse conceals income or inflates deductions, the marriage ends, the IRS discovers the problem, and both spouses receive a bill. The spouse who did not cause the problem needs innocent spouse relief to escape the joint liability.

What is traditional innocent spouse relief (IRC 6015(b))?

Traditional relief under IRC 6015(b) is the original form. It applies when there is an understatement of tax on the joint return (the return showed less tax than was actually owed) and the understatement is attributable to the other spouse. The requirements:

1. Joint return filed. The relief only applies to joint returns.
2. Understatement of tax. The return must have understated the tax due. This typically means unreported income or overstated deductions attributable to the other spouse.
3. You did not know and had no reason to know. When you signed the return, you did not know (and a reasonable person in your position would not have known) about the understatement.
4. It would be inequitable to hold you liable. Considering all the facts and circumstances, it would be unfair.

The “reason to know” standard is where most claims succeed or fail. The IRS considers what a reasonable person with the requesting spouse’s education, business experience, and involvement in the household finances would have known. A spouse who handled the finances, reviewed bank statements, or worked in the family business is held to a higher standard than a spouse who was not involved in financial matters.

If the requesting spouse received a significant benefit from the understatement (a lavish lifestyle funded by the unreported income), the IRS weighs that against relief. Receiving normal support (food, housing, clothing) is not a disqualifying benefit; receiving luxury items, expensive vacations, or gifts funded by hidden income may be.

What is separation of liability (IRC 6015(c))?

Separation of liability under IRC 6015(c) allocates the understatement between the spouses. Each spouse’s share of the liability is based on the items attributable to them. It is available only if:

1. You are divorced or legally separated from the spouse with whom you filed the joint return, OR
2. You are widowed, OR
3. You have not been a member of the same household as the other spouse during the 12-month period ending on the date you file Form 8857.

The advantage: separation of liability does not require proving you did not know about the understatement. The IRS simply allocates the deficiency based on which spouse’s income or deductions caused it. If your former spouse earned $200,000 in unreported income and you earned $50,000 in reported wage income, 100% of the understatement attributable to the $200,000 is allocated to them.

The limitation: it only applies to deficiencies (understatements). It does not apply to underpayments (where the return was correct but the tax was not paid). If the return reported $40,000 in tax and you both just did not pay, separation of liability does not help because there was no understatement.

There is also a disqualification: if the IRS can prove that you had actual knowledge of the item that caused the understatement, separation of liability is denied for that item. This is a higher bar than “reason to know” (actual knowledge, not constructive knowledge).

What is equitable relief (IRC 6015(f))?

Equitable relief under IRC 6015(f) is the catch-all. It applies when the requesting spouse does not qualify for traditional relief or separation of liability but it would be inequitable to hold them liable. It covers two situations that the other types do not:

1. Underpayments (the return was correct but the tax was not paid)
2. Cases where the requesting spouse had “reason to know” but not actual knowledge

The IRS evaluates equitable relief using a seven-factor test from Revenue Procedure 2013-34:

1. Marital status. Divorced, separated, or living apart for 12 months weighs in favor.
2. Economic hardship. Paying the tax would cause significant economic hardship (inability to pay basic living expenses).
3. Knowledge or reason to know. Whether the requesting spouse knew or had reason to know about the understatement or underpayment.
4. Legal obligation of the other spouse. Whether the other spouse has a legal obligation (from a divorce decree or agreement) to pay the tax.
5. Significant benefit. Whether the requesting spouse received a significant benefit from the unpaid tax or understatement.
6. Compliance history. Whether the requesting spouse has complied with their own tax obligations since the joint return.
7. Mental or physical health. Whether the requesting spouse was in poor mental or physical health at the time they signed the return.

No single factor is dispositive. The IRS weighs them together. In practice, the strongest equitable relief cases involve a requesting spouse who is divorced, would face economic hardship, did not know about the problem, did not benefit from it, and has been compliant since.

How do I file Form 8857?

Form 8857 (Request for Innocent Spouse Relief) is the filing. It asks for:

• The tax years for which you are requesting relief
• The items on the return you believe are attributable to the other spouse
• Why you did not know (or had no reason to know) about the understatement or underpayment
• Your current financial situation (income, expenses, assets, debts)
• A narrative explaining the facts and circumstances

The narrative is the most important part. Do not leave it blank or write one sentence. Explain the financial dynamic of the marriage: who handled the money, who reviewed bank statements, who prepared or reviewed the returns, what you knew about the other spouse’s income, what your lifestyle was, and what changed (divorce, discovery of the problem). Include supporting documents: the divorce decree, evidence of the other spouse’s control of finances, any communications showing you did not know.

Statute of limitations. There is no deadline for equitable relief requests (after the Supreme Court’s 2011 decision in United States v. Boyle). For traditional relief and separation of liability, the request must be filed within two years of the IRS’s first collection activity.

Notify the other spouse. The IRS is required to notify the other spouse or former spouse that you filed Form 8857. The other spouse has an opportunity to participate in the process (submit their own information). This can create conflict, especially in contentious divorces. The requesting spouse should be prepared for the other spouse to contest the claim.

Processing time. The IRS Taxpayer Advocate has reported average processing times of 14 months. If your case stalls beyond that, the Taxpayer Advocate Service can intervene to push processing. During this period, the IRS is not supposed to collect the liability from the requesting spouse (for the specific items being contested). Collection can continue for any portion of the liability not covered by the innocent spouse request.

How does this work for cross-border filers?

For Canadian-resident spouses of US citizens or green card holders, the innocent spouse problem has a cross-border layer:

Joint filing from Canada. A US citizen living in Canada who files a joint return with their Canadian-citizen spouse creates joint liability for both spouses. If the US-citizen spouse has unreported income or unpaid tax, the Canadian-citizen spouse is jointly liable even if they have never lived in the US, never earned US income, and never had a reason to understand US tax obligations. The Canadian spouse’s defense is usually strong (no knowledge, no reason to know, no benefit), but they still need to file Form 8857 to obtain relief.

Collection across the border. The IRS can potentially collect from Canadian assets of either spouse through the treaty’s collection assistance provisions (Article XXVIA). An innocent spouse who obtains relief will not face collection, but the request must be filed and processed before the IRS initiates collection action.

Treaty benefits. A Canadian spouse who had no US filing obligation of their own and was included on the joint return solely because of the marriage does not owe US tax on their own Canadian-source income (which is fully creditable under the treaty). The innocent spouse relief should eliminate any liability for the US-citizen spouse’s tax problems; the Canadian spouse’s own income should not be part of the deficiency.

What if the IRS denies my request?

If the IRS denies the request, you can petition the US Tax Court within 90 days of the denial. The Tax Court reviews the case de novo (from the beginning, not deferring to the IRS’s decision) and can grant relief that the IRS denied. The Tax Court has overturned IRS denials in many innocent spouse cases, particularly on the equitable relief factors.

You can also request an administrative appeal within the IRS before going to Tax Court. The IRS Appeals function reviews innocent spouse cases and can reverse the initial denial.

What should I do next?

If you are currently filing joint returns and are concerned about your spouse’s reporting: file separately (married filing separately). The tax may be higher, but you avoid joint liability for future years. If the joint return has already been filed and the IRS has assessed a deficiency: file Form 8857 with a detailed narrative and supporting documents. If you are divorced and the divorce decree assigns the tax debt to your former spouse: file Form 8857 anyway, because the IRS is not bound by the decree.

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.