Marriage changes your tax bracket and filing status, which usually lowers your overall tax bill — but not always in your favor

Getting married does not automatically mean a larger tax refund. Your refund depends on how much tax you paid during the year versus how much you actually owe. Marriage changes your filing status, which shifts your tax brackets and standard deduction, but the direction of that shift varies by income level and how much each spouse earned.

Some married couples pay less total tax and get larger refunds. Others pay more tax after marriage — a situation called the marriage penalty — and get smaller refunds or owe money instead. The outcome depends entirely on your household income, how that income is split between spouses, and whether you have children or other deductions.

Key Takeaways

  • Married filing jointly uses different tax brackets and a higher standard deduction than single filers, which can lower your tax bill but does not always.
  • The marriage penalty occurs when two earners with similar incomes pay more combined tax as a married couple than they would have as single filers.
  • Your refund size depends on what you paid in taxes during the year through withholding or estimated payments, not on your filing status alone.
  • You can estimate your new tax situation by using the IRS tax withholding estimator before the year ends, then adjust your W-4 if needed.

How filing status changes your tax brackets

When you marry and file jointly, the IRS treats your combined household income as a single tax return. The tax brackets for married filing jointly are wider than the brackets for single filers, which means more of your income falls into lower tax rates. For 2024, a single filer's 12% bracket ends at $11,600 of taxable income, but a married filing jointly couple's 12% bracket ends at $23,200.

This wider bracket sounds like an automatic win, but it only helps if your combined income would have pushed you into a higher bracket as a single filer. If you and your spouse each earned $30,000 as single people, you would each owe tax on $30,000 at single rates. Married filing jointly, you owe tax on $60,000 combined at married rates — which is lower per dollar, but the total tax owed depends on the specific brackets that year.

The standard deduction also increases for married filing jointly filers. For 2024, the standard deduction is $14,600 for single filers and $29,200 for married filing jointly — nearly double. This larger deduction reduces your taxable income before you even calculate tax owed.

Understanding the marriage penalty and marriage bonus

The marriage penalty happens when two people with similar, high incomes pay more total tax as a married couple than they would have as single filers. This occurs because tax brackets do not widen proportionally. If you and your spouse each earn $100,000, your combined $200,000 income as a married couple may push you into higher brackets faster than if you were single and each paid tax on $100,000 separately.

The marriage bonus is the opposite: when one spouse earns significantly more than the other, the couple's combined tax bill is lower than it would be if both were single. For example, if one spouse earns $150,000 and the other earns $20,000, filing jointly often results in less total tax than if they filed as single people.

The penalty or bonus is not visible in your refund directly — it shows up in your total tax bill for the year. If the penalty applies to you, your refund will be smaller than you might expect, or you may owe money. If the bonus applies, your refund may be larger.

How withholding and estimated payments affect your refund

Your refund is not determined by your filing status alone. It is the difference between the total tax you paid during the year and the total tax you owe. When you marry, your employer withholding may no longer match your actual tax liability, especially if both spouses work.

If you both work and did not update your W-4 forms after marriage, you may have had too little tax withheld from your paychecks. This means you could owe money at tax time instead of receiving a refund, even though marriage itself did not change your tax bill. Conversely, if you had too much withheld, you would receive a larger refund.

The IRS provides a tax withholding estimator on its website that lets you calculate what your withholding should be based on your new filing status and combined household income. You can use this tool before the end of the year and adjust your W-4 with your employer if needed.

What happens if one spouse has no income

If one spouse does not work or earns very little, filing jointly almost always results in a lower tax bill than if the working spouse filed as single. The non-working spouse's standard deduction is not wasted — it increases the household's total standard deduction and reduces taxable income for the working spouse.

For example, if one spouse earns $60,000 and the other earns nothing, filing jointly gives you a $29,200 standard deduction (2024 amount). The working spouse's taxable income becomes $30,800. If that same person filed as single, they would have a $14,600 standard deduction and $45,400 in taxable income — significantly higher.

Child tax credits and dependent deductions after marriage

Marriage also affects how you claim children and dependents. If you have children from a previous relationship or if you and your new spouse have children together, filing jointly may increase your access to the child tax credit, earned income tax credit, or other family-related deductions. These credits can substantially increase your refund.

However, if you each claimed a child as a dependent before marriage and now file jointly, you cannot claim the same child twice. You will need to decide which spouse claims each child, which affects your refund amount. The spouse with the higher income often benefits more from the credit, so that spouse typically claims the child.

Adjusting your withholding after marriage

The most direct way to control your refund size after marriage is to adjust your W-4 form with your employer. Your W-4 tells your employer how much tax to withhold from each paycheck. When your filing status changes, your withholding calculation changes too.

Use the IRS tax withholding estimator to find out what your combined household tax bill will be for the year. Then calculate how much total tax you need to have withheld from both spouses' paychecks combined to match that bill. Divide that amount by the number of remaining paychecks for the year, and adjust each spouse's W-4 accordingly.

If you want a larger refund, you can increase withholding. If you want to take home more money each paycheck, you can decrease withholding — but you will owe more at tax time or receive a smaller refund.

Frequently Asked Questions

Will I automatically get a bigger refund if I get married?

No. Your refund depends on how much tax you paid during the year versus how much you owe. Marriage changes your tax brackets and standard deduction, which may lower your total tax bill, but it does not may provide a larger refund. If you do not adjust your withholding after marriage, you may actually receive a smaller refund or owe money.

What is the marriage penalty and how much money does it cost?

The marriage penalty occurs when two people with similar high incomes pay more combined tax as a married couple than they would as single filers. The amount varies by income level and year. You can estimate your specific penalty using the IRS tax withholding estimator by comparing what you would owe as married filing jointly versus what you would owe as single filers.

Should I file married filing separately to avoid the marriage penalty?

Married filing separately usually results in a higher total tax bill than married filing jointly, even if one spouse earns much more. You lose access to many credits and deductions when filing separately. It is rarely the better choice unless you have specific circumstances like significant separate business losses or student loan interest deductions.

How do I know if I need to change my W-4 after getting married?

Use the IRS tax withholding estimator on the IRS website. Enter your combined household income, filing status, and any deductions or credits. The tool will tell you how much total tax you should have withheld for the year. If that amount is different from what you are currently having withheld, update your W-4 with your employer.

Can I file as single if I got married partway through the year?

No. Your filing status on December 31 determines your status for the entire year. If you were married on December 31, you must file as married filing jointly or married filing separately. You cannot file as single for that year, even if you were single for most of it.