How Does Getting Married Affect Your Taxes?

Getting married affects your taxes from the wedding day forward, and the IRS applies your new status to the entire calendar year based on where you stand on December 31.¹ A December wedding means the joint-filing rules cover income you earned in January. That one rule sets off a chain of changes: different brackets, a new standard deduction, shifted eligibility for credits, new retirement options, and a short list of paperwork you’ll need to handle before your first return together.

Your New Filing Status Choices

Once you’re married, you can no longer file as single. You have two main options on the federal return: Married Filing Jointly (MFJ) or Married Filing Separately (MFS). A third path exists for spouses who live apart.

Married Filing Jointly

Most couples pay less overall by filing jointly. MFJ unlocks the widest tax brackets, the largest standard deduction, and access to nearly every credit in the code. For 2026, the MFJ standard deduction is $32,200, exactly double the $16,100 single-filer amount.²

The tradeoff is joint and several liability. Both spouses are on the hook for the full tax bill, including any underpayment traced to the other person’s income. The IRS can pursue either spouse for the entire amount, and a divorce decree assigning responsibility to your ex doesn’t change that.

Married Filing Separately

MFS lets each spouse report only their own income, deductions, and credits.³ It’s the defensive play when you want to isolate yourself from a spouse’s potential liabilities. It can also help when one spouse has large unreimbursed medical costs, since the 7.5% AGI floor is easier to clear against a single income.⁴

The cost is steep. MFS filers lose access to education credits and face tighter thresholds for credits like the Child Tax Credit.³ If one MFS spouse itemizes, the other must also itemize, even if their individual deductions fall below the standard amount. The 2026 MFS standard deduction is $16,100, the same as a single filer’s.² The capital loss deduction is halved to $1,500 per year, compared to $3,000 for other filers.⁵ MFS filers are also completely ineligible for the student loan interest deduction, regardless of income.⁶

Head of Household While Married

A married person can file as Head of Household if they qualify as “considered unmarried.” The requirements: your spouse did not live in your home during the last six months of the tax year, you paid more than half the cost of maintaining that home, and a qualifying dependent lived with you for more than half the year.⁷ Head of Household offers better brackets and a higher standard deduction than MFS, so separated spouses who aren’t yet divorced should check whether they qualify.

Will Marriage Raise or Lower Your Tax Bill

Whether marriage helps or hurts you depends almost entirely on how similar your two incomes are. It’s a mathematical byproduct of how MFJ brackets compare with single-filer brackets.

A marriage bonus shows up when one spouse earns significantly more than the other, or when only one spouse works. The higher earner’s income spreads across wider MFJ brackets, keeping more of it taxed at lower rates. A couple where one person earns $180,000 and the other earns $30,000 will almost always pay less jointly than they would as two single filers.

A marriage penalty hits couples with roughly equal, high incomes. The MFJ tax brackets at the top are not double the single-filer brackets. For 2026, the 37% rate begins at $768,700 for joint filers.² Two people each earning $400,000 get pushed into the top bracket faster than they would filing individually.

Middle-income couples who take the standard deduction rarely feel a penalty, because the MFJ standard deduction is exactly twice the single amount. The penalty concentrates among higher earners who itemize and whose combined income reaches the compressed upper brackets.

Credits and Deductions That Change After Marriage

Child Tax Credit

For 2026, the Child Tax Credit is $2,200 per qualifying child. The credit begins to phase out at $400,000 of AGI for joint filers, double the $200,000 threshold for single filers.⁸ A couple earning $350,000 combined still gets the full credit on a joint return, while a single parent earning $250,000 would already see it reduced.

Earned Income Tax Credit

Joint filers have higher AGI limits for the EITC than single filers, which can pull in couples where one spouse earns little or nothing.⁹ Filing separately usually shuts the credit down. A married person filing separately can claim the EITC only if they lived apart from their spouse for the last six months of the tax year or were legally separated under a written agreement, and they have a qualifying child living with them for more than half the year.¹⁰

Student Loan Interest

You can deduct up to $2,500 in student loan interest each year, and the phase-out range for joint filers is roughly double the single-filer range.⁶ Borrowers on income-driven repayment plans have a separate consideration: filing jointly uses both incomes to calculate the monthly payment, while filing separately uses only your own.¹¹ MFS can lower the payment substantially, but you give up the interest deduction and other credits to get it.

Medical Expenses

You can only deduct unreimbursed medical expenses that exceed 7.5% of your AGI.⁴ Combining two incomes on a joint return raises the floor. If your combined AGI is $160,000, you need more than $12,000 in qualifying costs before any deduction applies. A spouse who cleared that threshold easily as a single filer may fall short on a joint return. This is one of the few areas where MFS can produce a real advantage.

State and Local Tax Deduction

The SALT deduction cap was raised significantly under the One, Big, Beautiful Bill for 2026. MFS filers receive half the cap. In high-tax states, couples who both have substantial property and state income taxes can hit the cap on a joint return at the same level a single filer would, which is a quiet marriage penalty.

Additional Medicare Tax

An extra 0.9% Medicare surtax applies to earned income above $250,000 for joint filers, compared with $200,000 for single filers.¹² The joint threshold is less than double the single threshold. Two single people each earning $190,000 owe no additional Medicare tax; the same couple filing jointly owes the surtax on $130,000 of combined income. These thresholds don’t adjust for inflation, so the effect grows over time.

Selling a Home After Marriage

Married couples filing jointly can exclude up to $500,000 of capital gains from the sale of a primary residence, compared with $250,000 for a single filer. At least one spouse must have owned the home for two of the five years before the sale, and both spouses must have lived in it as their main home for at least two of those five years. Neither spouse can have used the exclusion in the two years before the sale.¹³

If you’re sitting on a home that has appreciated significantly, timing the sale after marriage can save tens of thousands, provided both of you meet the use test.

Retirement Accounts

Marriage opens a retirement savings door that doesn’t exist for single filers: the spousal IRA. Normally, you need earned income to contribute to an IRA. If you file jointly, a working spouse can fund an IRA for a non-working spouse as long as their earned income covers both contributions.¹⁴ For 2026, the contribution limit is $7,500 per person, or $8,600 if you’re 50 or older.¹⁵ A single-earner couple can put away up to $15,000 combined in IRAs each year.

Roth IRA eligibility also shifts. For 2026, joint filers can make full Roth contributions if their combined modified AGI is under $242,000, with eligibility phasing out completely at $252,000. MFS filers who lived with their spouse at any point during the year face a phase-out that effectively starts at zero, which makes Roth contributions nearly impossible under that status. Check your combined income against the joint limits before contributing after the wedding.

Health Savings Accounts follow their own rule. If either spouse has a high-deductible health plan with family coverage, both spouses are treated as having family coverage for HSA purposes. The 2026 family HSA contribution limit is $8,750 total across both spouses, not per person. Couples who each had their own HSA as single filers need to coordinate contributions to avoid exceeding the shared limit and triggering a 6% excise tax on the overage.

Tax-Free Transfers Between Spouses

The unlimited marital deduction lets spouses transfer an unlimited amount of assets to each other, whether by gift or inheritance, with zero federal gift or estate tax.¹⁶ You can add your spouse to a bank account, deed them half the house, or gift them investments without filing a gift tax return. This applies only when the receiving spouse is a U.S. citizen.

For non-citizen spouses, a separate annual limit replaces the unlimited deduction. The base statutory amount is $100,000, adjusted for inflation, and gifts above that count against your lifetime gift tax exemption.¹⁶ Larger transfers to a non-citizen spouse deserve a conversation with a tax professional.

The Risk of Joint Liability

Signing a joint return makes each spouse fully responsible for the whole bill. If the IRS later finds unreported income or a false deduction, either spouse can be pursued for every dollar, plus interest and penalties. Three forms of relief exist for spouses who end up on the hook for something they didn’t cause: innocent spouse relief for errors you didn’t know about,¹⁷ separation of liability relief for divorced or long-separated spouses,¹⁸ and equitable relief as a catch-all when the first two don’t fit.¹⁹ All three are requested on Form 8857 and only cover your spouse’s share of the problem, never your own income. If your future spouse has a complicated financial history, this risk is worth weighing against the joint-filing benefits before your first return together.

What to Do Right After the Wedding

The federal tax system doesn’t update itself. A few administrative steps handled early prevent refund delays and April surprises.

Both spouses should submit a new Form W-4 to their employers within 10 days of the marriage.²⁰ Simply checking the “Married filing jointly” box without running the numbers is where most newlyweds go wrong. Payroll assumes your spouse has little or no income unless you say otherwise, which causes under-withholding when both spouses work. Use the IRS Tax Withholding Estimator to set the right amount for your combined household income.²¹

If either spouse changed their legal name, the new name must match Social Security Administration records before you file. A mismatch will flag the return and delay any refund. You’ll need to present a certified marriage document, not a photocopy or notarized copy, along with your request for a replacement Social Security card.²²

If you’ve moved into a shared home, file Form 8822 to update your address with the IRS. Processing takes four to six weeks, and the form should be mailed separately from your return.

Beyond the paperwork, the weeks after a wedding are the right time to review beneficiary designations on retirement accounts and insurance policies, coordinate benefit elections at the next open enrollment, and revisit estimated tax payments if either spouse is self-employed. Marriage rearranges enough pieces of the tax picture that addressing only the obvious ones tends to leave money on the table.

1
Internal Revenue Service. Filing Status
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Internal Revenue Service. Filing Status
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Internal Revenue Service. Topic No. 502, Medical and Dental Expenses
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Internal Revenue Service. Topic No. 409, Capital Gains and Losses
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Internal Revenue Service. Topic No. 456, Student Loan Interest Deduction
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Internal Revenue Service. Filing Status
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Internal Revenue Service. Child Tax Credit
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Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables
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Internal Revenue Service. Who Qualifies for the Earned Income Tax Credit (EITC)
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Federal Student Aid. 4 Things to Know About Marriage and Student Loan Debt
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Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
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Internal Revenue Service. Topic No. 701, Sale of Your Home
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Internal Revenue Service. Publication 590-A, Contributions to Individual Retirement Arrangements (IRAs)
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Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
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Office of the Law Revision Counsel. 26 U.S. Code 2523 – Gift to Spouse
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Internal Revenue Service. Innocent Spouse Relief
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Internal Revenue Service. Separation of Liability Relief
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Internal Revenue Service. Equitable Relief
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Internal Revenue Service. Tax To-Dos for Newlyweds to Keep in Mind
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Social Security Administration. Learn What Documents You Will Need to Get a Social Security Card