Taxes After Getting Married 2026
Should you file jointly or separately? Here's how marriage changes your taxes for 2026.
Once you're married on December 31, you file as Married Filing Jointly (MFJ) or Married Filing Separately (MFS) for the whole year. MFJ is better for the large majority of couples — wider brackets, a bigger standard deduction, and access to more credits. MFS helps only in specific cases (income-driven student-loan payments, large medical bills tied to one spouse, or liability separation). Run both to be sure.
What changes for your taxes
- Your filing status becomes MFJ or MFS for the entire year, even if you married on December 31.
- Combining incomes can create a 'marriage bonus' (often) or a 'marriage penalty' (two high earners).
- Both spouses should refile a W-4 — two incomes often mean the default withholding is too low.
- Some credits and deductions phase out at higher combined income.
MFJ vs MFS — how to decide
Married Filing Jointly gives you the widest tax brackets, the largest standard deduction, and eligibility for credits that MFS disqualifies you from (education credits, most of the Child and Dependent Care Credit, and more). For the vast majority of couples, MFJ produces a lower combined tax.
Married Filing Separately wins in narrow situations: when one spouse has income-driven student-loan payments based only on their own income, when one spouse has large medical expenses that clear the 7.5%-of-AGI floor more easily on a smaller income, or when you want to separate tax liability. The only way to be certain is to compute your tax both ways — run the federal calculator once jointly and once for each spouse.
| Your situation | Usually best | Why |
|---|---|---|
| One earner + one non-earner | MFJ | Big marriage bonus — income fills the wide joint brackets |
| Two similar high incomes | MFJ | Still lower combined tax; watch for a small penalty |
| Spouse on income-driven student loans | Compare MFS | MFS can base the loan payment on one income |
| Large medical bills for one spouse | Compare MFS | Easier to clear the 7.5%-of-AGI floor on lower income |
| Want separate liability | MFS | Each spouse is responsible only for their own return |
Which situation is yours?
Your action checklist
Frequently asked questions
Do I have to file jointly if I'm married?
No, but you must file as either Married Filing Jointly or Married Filing Separately. Single is no longer an option once you're married as of December 31. MFJ is usually better.
Is there a marriage tax penalty?
Sometimes. Two similar high incomes can push a couple into higher brackets together than they'd face apart (a penalty). More often, one-earner or unequal-income couples get a 'bonus' — a lower combined tax.
When is filing separately better?
Mainly for income-driven student-loan payments, when one spouse has high medical expenses relative to income, or to separate liability. It usually costs more in total tax, so compare both ways.
Sources & verification
Last reviewed July 12, 2026.