Start with the rule that surprises everyone: your divorce decree does not bind the IRS. The judge can order your spouse to pay the joint tax debt, and the IRS can still collect every dollar of it from you, because joint and several liability on a joint return is federal law that no state court order overrides. Between you and your ex, the decree creates rights worth enforcing - but between you and the IRS, you are both fully on the hook. Planning around that reality is the whole game.
Decisions While the Divorce Is Pending
The biggest live decision is filing status for the current year. Filing jointly with a soon-to-be-ex means signing up for joint liability on one more year of their income, their withholding shortfalls, and their audit risk - sometimes worth it for the tax savings, often not. Married filing separately costs some tax benefits but walls off the liability, and for a spouse who already distrusts the other's finances, that wall is frequently worth the price. This decision deserves actual analysis, not the default of doing what you did last year.
Refunds need protection too: a joint refund will be offset against either spouse's separate debts - back taxes, student loans, child support - and the injured spouse claim on Form 8379 exists to recover your share when their debt ate your refund.
Dividing Debt the IRS Will Not Honor
Since the decree cannot bind the IRS, structure matters: indemnification clauses with teeth, escrowed funds for known liabilities, and realistic expectations about what happens if the paying spouse defaults. And for debts from returns you signed during the marriage, innocent spouse relief is the federal remedy that actually moves liability - three forms of it, with the broad equitable version covering tax that was reported correctly but never paid, weighing factors like financial control, abuse, and who actually benefited.
Coordinate the Two Cases
Your divorce lawyer handles the marriage; the tax problem needs its own counsel, and the two strategies need to talk to each other - what gets agreed in the settlement shapes what is winnable with the IRS later. If a tax debt is sitting in the middle of your divorce, bring me into the picture before the agreement is signed, not after. Let's talk.