It can free you from tax debt caused by your spouse’s errors on a joint return — if you didn’t know and had no reason to know about the understatement. You generally must apply within 2 years of IRS collection activity.
Filing jointly makes both spouses fully liable for the entire tax bill — including debt created by one spouse’s unreported income or false deductions. Innocent spouse relief is the escape valve: if the understatement was your spouse’s doing and you didn’t know (and reasonably couldn’t have known), you can be relieved of that liability. Related options include separation of liability (dividing the debt after divorce/separation) and equitable relief for cases that don’t fit the standard rules. You apply with Form 8857, generally within two years of the IRS starting collection against you.
Possibly — signing alone doesn’t disqualify you. The question is whether you knew or had reason to know of the understatement when you signed.
Divorce doesn’t erase joint liability, but it can support separation-of-liability relief, which allocates the debt between you.
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