By Harry Prabandham · Updated September 28, 2026
Tax Planning
Marriage and Taxes: Filing Status, Marriage Penalties, and What to Update
Marriage changes filing status, brackets, and several thresholds. Couples with similar high incomes can face penalties in the top bracket, SALT, and NIIT.
Marriage and Taxes: Filing Status, Marriage Penalties, and What to Update
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How does getting married affect taxes?
- Couples married on December 31 are treated as married for the whole year and file jointly or separately.
- Joint filing combines incomes, which can lower total tax when incomes differ widely and raise it when both incomes are high.
- Several thresholds for joint filers are less than double the single amounts, which creates marriage penalties.
- Joint filers are each liable for the full tax on the joint return.
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How does getting married affect taxes?
- Couples married on December 31 are treated as married for the whole year and file jointly or separately.
- Joint filing combines incomes, which can lower total tax when incomes differ widely and raise it when both incomes are high.
- Several thresholds for joint filers are less than double the single amounts, which creates marriage penalties.
- Joint filers are each liable for the full tax on the joint return.
Where do marriage penalties show up?
- In 2026, joint brackets are double the single brackets through the 35% rate, but the 37% rate starts at $768,700 joint versus $640,600 single.
- The SALT cap is $40,400 for both single and joint filers in 2026, so two single people can deduct more than one married couple.
- The 3.8% net investment income tax starts at $250,000 joint versus $200,000 single.
- Medicare IRMAA's top tier starts at $750,000 joint versus $500,000 single, though its first tier is exactly double.
When might married filing separately make sense?
- Married filing separately can limit liability for a spouse's return and, under some income-driven student loan plans, exclude a spouse's income.
- It rules out several benefits, including education credits and, in most cases, the earned income credit.
- If one spouse itemizes on a separate return, the other must also itemize.
- Running both calculations each year shows the actual trade-off.
How do community property states change separate returns?
- IRS Publication 555 lists nine community property states: Arizona, California, Idaho, Louisiana, Nevada, New Mexico, Texas, Washington, and Wisconsin.
- Spouses there who file separately generally each report half of community income, plus their own separate income.
- Each spouse attaches Form 8958 to show how income was allocated.
- State law determines what counts as community versus separate property.
What should newly married couples update?
- Update Form W-4 at each job, since two incomes combined can push withholding below the tax owed.
- Report any name change to Social Security so the tax return matches SSA records.
- Review beneficiary designations on retirement accounts and life insurance, which override a will.
- Revisit estate documents, since marriage changes default inheritance and spousal rights.
What planning opportunities does marriage create?
- A spouse with little or no pay can contribute to an IRA based on the working spouse's compensation.
- Unlimited transfers between U.S. citizen spouses are generally free of gift tax.
- Couples can coordinate which spouse's workplace plans, HSAs, and equity compensation to use first.
- Same-sex married couples receive the same federal tax treatment as all married couples.
Key takeaways
- Marriage can raise or lower total tax depending on how the two incomes compare.
- The 37% bracket, SALT cap, NIIT, and top IRMAA tier are common penalty points for high earners.
- Filing separately has costs; compare both methods annually.
- Confirm filing choices with a CPA, since Rubric Advisors does not prepare tax returns.
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