In the year of separation, MFS can beat MFJ when incomes are lopsided, deductions are personal, or spouse is untrustworthy.
MFS loses several credits (EITC, education, adoption) but wins when: (1) one spouse has large medical expenses (7.5% AGI floor is lower on smaller AGI), (2) miscellaneous deductions before the 2% AGI floor, (3) unreimbursed casualty, (4) IBR/PAYE student-loan payments (based on individual AGI — often $10K+/yr savings), (5) protecting a refund from spouse's back taxes. Run BOTH scenarios in the separation year.
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A Qualified Domestic Relations Order splits qualified plans between spouses with no 10% penalty and no tax.
Three flavors of §6015 relief remove joint liability for a spouse's understated tax, deficiency, or unpaid balance.
Grantor trust for the benefit of an ex-spouse shifts income taxation to the lower-bracket recipient post-TCJA.
A properly-drafted marital agreement locks down separate ownership of pre-marital and gift/inherited assets.
§408(d)(6) IRA transfers and §223(f)(7) HSA transfers pursuant to divorce decree are tax-free — no rollover rules apply.
Divorced spouses can still both claim §121 use/ownership tests via §121(d)(3) tacking — up to $500K exclusion preserved.
Property transfers between spouses (or ex-spouses within 1 yr / incident to divorce within 6 yrs) are tax-free.
With alimony non-deductible post-2018, restructure as property transfers, HSA/IRA splits, and unallocated support.