Marriage usually shrinks your refund, but the direction depends on your income split

Filing as married changes how the IRS calculates your tax liability, and for most couples, that means a smaller refund than if you filed single. The marriage penalty or marriage bonus — the difference between what you owe as a married couple versus what you would owe filing separately — is built into the tax brackets and standard deduction. If you and your spouse earn similar amounts, you typically pay more tax together. If one spouse earns significantly more, you might pay less. Your refund shrinks or grows depending on whether that tax change is larger than the withholding you've already paid.

The size of the shift depends entirely on your household income, how that income is split between you, and how much your employer has already withheld from your paychecks. There is no single answer that applies to everyone — a couple earning $80,000 combined will see a different effect than a couple earning $200,000 combined, and a couple where one person earns $150,000 and the other earns $0 will see yet another outcome.

Key Takeaways

  • Two earners with similar incomes usually face a marriage penalty: you pay more tax as a married couple than you would have paid filing single, which reduces your refund.
  • One high earner and one low or non-earner usually see a marriage bonus: you pay less tax together, which increases your refund.
  • Your refund size also depends on how much your employers withheld during the year, not just on your total tax bill.
  • You can estimate the marriage effect by running your taxes both ways — married filing jointly and as if you were still single — before you file.
  • Changing your W-4 withholding after marriage can prevent a surprise refund change next year.

Why two earners with similar incomes usually get smaller refunds

The tax code uses tax brackets — income ranges taxed at different rates — and those brackets are narrower for married couples than they are for single filers. When you file single, a portion of your income sits in the 12% bracket, a portion in the 22% bracket, and so on. When you marry someone earning a similar amount, the combined income pushes both of you into higher brackets faster. That means more of your household income gets taxed at higher rates than it would have if you were still filing single.

Example: In 2024, a single filer pays 22% on income between $47,150 and $100,525. A married couple filing jointly pays 22% on income between $94,300 and $201,050. If you and your spouse each earned $75,000 as single filers, you would each use the lower portion of the 22% bracket. Combined as a married couple earning $150,000, more of that income sits in the higher bracket. You owe more tax on the same total income — that is the marriage penalty.

If you were already having too much withheld (which is why you get a refund at all), the marriage penalty makes that overpayment smaller. Your refund shrinks because your actual tax bill went up, even though your withholding stayed the same.

Why one high earner and one low earner often get larger refunds

When income is unequal, the math reverses. A couple where one spouse earns $180,000 and the other earns $20,000 pays less tax together than the high earner would have paid alone. The lower-earning spouse's income fills in the lower tax brackets first, and the high earner's income sits in higher brackets — but the brackets are wider for married couples, so less of the high earner's income gets pushed into the very top rates.

This marriage bonus reduces your total tax bill. If you were already having too much withheld, the bonus makes your refund larger. The high earner's employer has been withholding based on their individual income, but now that income is being taxed at a lower effective rate because it is paired with the lower earner's income on a joint return.

How withholding affects the refund you actually receive

Your refund is not the same as your tax bill. Your refund is the difference between what you owe and what you have already paid through withholding. Marriage changes your tax bill, but it does not automatically change your withholding — your employer still withholds based on the W-4 you filed before you married.

If you face a marriage penalty and your withholding has not changed, you owe more tax but have not paid more through withholding. Your refund shrinks. If you face a marriage bonus and your withholding has not changed, you owe less tax but have paid the same amount through withholding. Your refund grows.

This is why two people who marry and file jointly for the first time often see a refund surprise. Neither person changed their W-4, but the tax bill changed, so the refund does too.

How to estimate whether your refund will grow or shrink

The most reliable way to see the marriage effect is to run your taxes both ways before you file. Use tax software or a spreadsheet to calculate what you would owe if you filed married filing jointly, then calculate what you would have owed if you were still single. The difference is the marriage penalty or bonus. If the penalty or bonus is larger than the difference in your withholding, your refund will move in that direction.

You can also use the IRS tax brackets and standard deduction for the year you are filing. Look up the standard deduction for single filers and for married filing jointly. Calculate your taxable income under each scenario. Run that through the brackets. The difference in tax owed is the marriage effect.

If you discover you will face a marriage penalty next year, you can adjust your W-4 to have less withheld, which will increase your take-home pay during the year and reduce the refund. If you will face a marriage bonus, you can adjust your W-4 to have more withheld, which will reduce your take-home pay but increase your refund. The IRS W-4 calculator at irs.gov can help you find the right withholding for your married household.

What happens if you file married filing separately instead

You have the option to file married filing separately instead of married filing jointly. This uses different tax brackets and a different standard deduction — usually less favorable than filing jointly. Most couples who file separately do so because of student loan forgiveness rules, spousal liability concerns, or to protect one spouse's refund from the other's debts. Filing separately does not eliminate the marriage penalty or bonus; it usually makes the tax bill worse overall.

If you are considering filing separately, calculate your taxes both ways before deciding. The marriage penalty or bonus exists either way, but filing separately typically means paying more total tax as a household.

Frequently Asked Questions

Will I definitely get a smaller refund now that I am married?

Not necessarily. If your spouse earns significantly less than you, you may face a marriage bonus and get a larger refund. The direction depends on your income split. Run your taxes both ways to see which applies to you.

Can I file single after I get married to avoid the marriage penalty?

No. Once you are married, you must file as married filing jointly or married filing separately. You cannot file as single. The IRS determines filing status based on your marital status on December 31 of the tax year.

If my spouse and I file jointly, are we both responsible for the tax bill?

Yes. Filing jointly means you are both liable for the full tax owed, even if one spouse earned all the income. If one spouse owes back taxes or has unpaid debts, the IRS can take the refund to pay them. If this is a concern, you may want to file separately, though that usually costs more in total tax.

Should I change my W-4 now that I am married?

Yes, if you want to avoid a refund surprise next year. Use the IRS W-4 calculator to see how much you should have withheld as a married household. If you do not adjust, your withholding will be based on your single status, and your refund will shift when you file jointly.

Does the marriage penalty explore to same-sex couples?

Yes. The tax code treats all married couples the same way, regardless of the sex or gender of the spouses. The marriage penalty or bonus applies based on income split, not on the type of marriage.