Whether you pay less in taxes when you get married depends almost entirely on how your income compares to your spouse’s. Couples with one high earner and one low or non-earning spouse usually pay less filing jointly than they would as two singles. Couples where both spouses earn well into six figures can pay more. For most households in between, marriage is roughly tax-neutral at the federal level, with the real differences showing up in specific credits, surtaxes, and deductions rather than in the basic brackets.
When Marriage Lowers Your Tax Bill
The savings come from a simple structural feature: for 2026, the standard deduction for a married couple filing jointly is $32,200, exactly double the $16,100 available to a single filer, and the income thresholds for most tax brackets also double.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill When one spouse earns much less than the other, the lower earner’s unused bracket space effectively pulls the higher earner’s income into lower rates.
Consider a single person earning $200,000. After the standard deduction, they’d pay roughly $35,000 in federal income tax. Married and filing jointly with a spouse who doesn’t work, that same person’s tax drops to about $28,000, because more of their income now falls into the 10% and 12% brackets. If one spouse earns $130,000 and the other earns $30,000, filing jointly keeps the combined $160,000 entirely inside the 22% bracket after the standard deduction, whereas the higher earner alone would have crossed into 24% territory.
Through the 32% bracket, every married-filing-jointly threshold is exactly twice the single threshold.2Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed A single person hits 24% at $105,700; a married couple doesn’t reach it until $211,400. For the vast majority of taxpayers, this doubling is where the marriage bonus lives.
Bonuses Beyond the Brackets
Selling a primary residence is one of the clearest wins. A single homeowner can exclude up to $250,000 of profit from a home sale; a married couple filing jointly can exclude up to $500,000, provided both spouses lived in the home for at least two of the five years before the sale and at least one spouse owned it during that period.3Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain From Sale of Principal Residence In appreciated housing markets, that doubled exclusion can save tens of thousands.
Retirement accounts open up too. The spousal IRA lets a working spouse contribute to an IRA for a non-earning spouse. For 2026, that’s up to $7,500, or $8,600 if the non-earning spouse is 50 or older.4Internal Revenue Service. Publication 590-A, Contributions to Individual Retirement Arrangements (IRAs) A single person with no earned income can’t contribute at all. Roth IRA income limits are also more generous jointly: for 2026, married couples filing jointly can make full Roth contributions if modified adjusted gross income is below $242,000, phasing out entirely at $252,000, compared to $81,000 to $91,000 for singles.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Long-term capital gains follow the same doubling pattern. For 2026, married couples filing jointly pay 0% on capital gains up to $98,900 in taxable income, 15% up to $613,700, and 20% above that. Marriage doesn’t create a penalty on investment income at these rates.
When Marriage Costs You More
The symmetry breaks at the top of the bracket structure. A single filer doesn’t hit the 37% rate until income exceeds $640,600, so two single people could earn a combined $1,281,200 before either faced that rate. A married couple filing jointly crosses into 37% at just $768,700.1Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill A couple where both spouses earn $400,000 pays more together than they would as two singles. This is the classic marriage penalty, and it’s concentrated among dual high earners.
Surtaxes That Don’t Double
Two extra taxes make things worse for high-income couples. The Additional Medicare Tax adds 0.9% on earned income above $250,000 for joint filers, compared to $200,000 for single filers.6Internal Revenue Service. Topic No. 560, Additional Medicare Tax Two singles each earning $190,000 avoid the tax entirely; married and filing jointly on the same combined $380,000, $130,000 of their earnings gets hit.
The 3.8% Net Investment Income Tax uses the same $250,000 joint threshold against $200,000 for singles.7Internal Revenue Service. Topic No. 559, Net Investment Income Tax Neither threshold is indexed for inflation; they’ve sat at the same dollar figures since 2013.
The SALT Cap
The state and local tax deduction cap was raised to approximately $40,000 for 2026 under the One, Big, Beautiful Bill Act, but it doesn’t double for married couples. Two unmarried people living together could each claim up to $40,000, a combined $80,000. A married couple filing jointly is limited to a single $40,000 deduction. In high-tax states with large property tax bills, this gap adds real money to the penalty side.
The EITC Cliff for Working-Class Couples
The Earned Income Tax Credit can create one of the sharpest marriage penalties in the code, and it hits lower down the income ladder than the surtaxes do. A single parent earning $25,000 with two children might receive a substantial EITC. After marrying a spouse earning $45,000, their combined $70,000 could eliminate the credit entirely.8Office of the Law Revision Counsel. 26 USC 32 – Earned Income The maximum credit for a family with three or more children was $8,046 for 2025, with joint filers allowed to earn up to $68,675 before losing eligibility.9Internal Revenue Service. Earned Income and Earned Income Tax Credit (EITC) Tables The 2026 figures will be adjusted for inflation.
Credits That Reward Marriage
The Child Tax Credit runs the other direction. For 2026, the credit provides up to $2,200 per qualifying child, and it starts phasing out at $400,000 of adjusted gross income for married couples filing jointly, compared to $200,000 for single filers.10Office of the Law Revision Counsel. 26 USC 24 – Child Tax Credit That doubled phase-out is one of the clearest marriage bonuses in the code. A single parent at $210,000 sees the credit start shrinking; a married couple at the same combined income keeps the full amount. The refundable portion is capped at $1,700 per child for 2026, and it phases in based on earnings above $2,500, so very low-income families may not receive the full credit even when their children qualify.
Joint or Separate: Which One Actually Costs Less
Most couples file jointly because it unlocks the full standard deduction, the doubled bracket thresholds, and credits that separate filers lose entirely.11Internal Revenue Service. Tax To-Dos for Newlyweds to Keep in Mind Filing separately disqualifies you from the Earned Income Tax Credit and, in most cases, the Child and Dependent Care Credit.12Taxpayer Advocate Service. The Tax Ramifications of Tying the Knot The traditional IRA deduction phase-out range for a separate filer covered by a workplace plan collapses to $0 to $10,000, effectively eliminating the deduction for anyone with even modest income.5Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Two situations still make separate filing worth running the numbers on. Medical expenses are deductible only above 7.5% of adjusted gross income.13Office of the Law Revision Counsel. 26 USC 213 – Medical, Dental, Etc., Expenses If one spouse has major medical bills and low individual income, separate filing makes the threshold much easier to clear. On a separate return showing $40,000 in income, the floor is $3,000; on a joint return with $150,000, it’s $11,250.
The other case is income-driven federal student loan repayment. Most income-driven plans count both spouses’ incomes toward the monthly payment when you file jointly. Filing separately limits the calculation to the borrower’s income.14Federal Student Aid. 4 Things to Know About Marriage and Student Loan Debt A spouse with heavy student debt and lower earnings can sometimes save more on loan payments than they lose in higher taxes.
One boundary worth knowing: signing a joint return makes both spouses responsible for the entire tax liability, not just their share. The IRS can collect the full amount from either spouse years later, even if a divorce decree assigns the debt to your ex. Innocent spouse relief exists but has to be applied for.15Internal Revenue Service. Instructions for Form 8857
What to Do After You Get Married
The IRS treats you as married for the entire year if you’re married as of December 31, with no prorating for a wedding date.11Internal Revenue Service. Tax To-Dos for Newlyweds to Keep in Mind A late-December marriage changes your filing status for the whole tax year that just ended.
Two housekeeping steps prevent surprises. If either spouse changes their name, the Social Security Administration needs to know before you file, because the name on the return must match SSA records or the IRS may reject it. You can start the change through your my Social Security account in some states, or by submitting Form SS-5.16Social Security Administration. How Do I Change or Correct My Name on My Social Security Number Card
Both spouses should also file updated W-4 forms with their employers. Withholding calculations change with filing status, and Step 2 of the W-4 specifically addresses two-income households.17IRS. Form W-4, Employee’s Withholding Certificate Leaving old single-filer withholding in place while filing jointly is one of the most common newlywed mistakes and can produce a surprise April bill along with an underpayment penalty. The IRS withholding estimator at irs.gov/W4App is the fastest way to check.