Married vs. Single Tax Rates: Brackets, Penalties, and Credits

Married couples filing jointly get wider tax brackets and a bigger standard deduction than single filers, but married versus single tax rates only diverge meaningfully at certain income points. For 2026, a single filer’s standard deduction is $16,100 and a joint filer’s is $32,200, exactly double.¹ Every ordinary income bracket from 10% through 32% is also exactly double. Two people earning $100,000 each owe the same total federal income tax whether they file as two singles or as a married couple. The rates only pull apart at the top of the schedule, in credit and surtax thresholds, and in a handful of side provisions where marriage costs money.

2026 Brackets Side by Side

Federal income tax is progressive: only the income falling inside each range is taxed at that range’s rate. For 2026:¹

10%: Up to $12,400 single / $24,800 joint
12%: $12,401–$50,400 / $24,801–$100,800
22%: $50,401–$105,700 / $100,801–$211,400
24%: $105,701–$201,775 / $211,401–$403,550
32%: $201,776–$256,225 / $403,551–$512,450
35%: $256,226–$640,600 / $512,451–$768,700
37%: Over $640,600 / Over $768,700

Notice where the doubling stops. The 35% bracket for a single filer runs all the way to $640,600, covering roughly $384,000 of income. For a joint filer, the same bracket covers only about $256,000 before the 37% rate kicks in at $768,700. If the top threshold followed the pattern of the lower brackets, the 37% rate wouldn’t hit a couple until $1,281,200. That compression is where the marriage penalty for high earners lives.

Standard Deduction

The joint standard deduction is twice the single amount, so it produces no bracket advantage on its own for two equal earners. The benefit appears when incomes are uneven: the lower-earning spouse’s unused deduction shelters income the higher earner would otherwise pay tax on. Filers 65 or older or blind get an additional $2,050 if single or head of household, or $1,650 per qualifying spouse if married. If one spouse itemizes, the other cannot claim the standard deduction on a separate return.

When Marriage Lowers Your Taxes

A couple where one spouse earns $200,000 and the other earns nothing gets a real bonus from filing jointly. The earner’s income spreads across brackets that are twice as wide, so less of it climbs into higher rates than it would on a single return. The non-working spouse’s $16,100 standard deduction also comes into play, sheltering income that would otherwise be taxed at the earner’s top marginal rate. The more lopsided the two incomes, the larger the bonus.

When Marriage Raises Your Taxes

The penalty shows up in several places, and not all of them are at the top of the income scale.

The Top Bracket

Two singles each earning $640,600 sit at the edge of the 35% bracket and owe nothing at 37%. Married and filing jointly, their combined $1,281,200 pushes $512,500 past the $768,700 joint threshold for 37%. The extra 2 percentage points on that half million costs roughly $10,250 more than the two singles would have owed.¹ The gap widens as incomes rise further.

The SALT Cap

The state and local tax deduction cap is $40,000 for 2026 filers with modified AGI under $500,000, and it phases down for higher earners. The same $40,000 cap applies whether you file single or married jointly. Two unmarried people sharing a home can each deduct up to $40,000, for a combined $80,000. Marry, and the household cap collapses to $40,000. In a high-tax state, the lost deduction can add $10,000 or more to the annual bill.

Earned Income Tax Credit

At the lower end of the income scale, the EITC creates its own penalty. The 2026 maximum AGI limits are:²

No children: $19,540 single / $26,820 joint; maximum credit $664
One child: $51,593 / $58,863; maximum credit $4,427
Two children: $58,629 / $65,899; maximum credit $7,316
Three or more: $62,974 / $70,224; maximum credit $8,231

The joint limits sit only about $7,000 above the single limits, not double. Two partners each earning around $30,000 would each qualify for a meaningful credit as singles. Married, their combined $60,000 can exceed the joint ceiling and eliminate the credit entirely. For lower-income couples, this is often the single most expensive consequence of marrying.

Surtaxes on Investment Income and Wages

Two surtaxes carry hard-coded thresholds that Congress hasn’t updated since 2013. The Net Investment Income Tax adds 3.8% on the lesser of net investment income or the amount by which modified AGI exceeds $200,000 single or $250,000 joint.³ The Additional Medicare Tax adds 0.9% on wages above those same dollar figures.⁴ Two singles each earning $199,000 owe nothing on either. Married, their combined $398,000 exceeds the $250,000 joint threshold by $148,000, exposing a large chunk of income to both surtaxes. Inflation pushes more couples across these lines each year because the thresholds don’t move.

Long-Term Capital Gains

Long-term capital gains and qualified dividends use their own preferential rates, and the joint-versus-single pattern repeats. For 2026:

0%: Taxable income up to $49,450 single / $98,900 joint
15%: $49,451–$545,500 / $98,901–$613,700
20%: Over $545,500 / Over $613,700

The 0% threshold doubles, but the 20% rate hits joint filers at $613,700 rather than at $1,091,000. A two-earner couple selling appreciated stock can hit the 20% rate sooner than they would as singles. Married filing separately gets the worst deal here, with the 20% rate starting at $306,850.

Does Filing Separately Fix the Penalty?

Married filing separately uses brackets identical to single brackets from 10% through 32%. The 35% bracket ends at $384,350, and the 37% rate begins above that, so the top-bracket compression carries over: separate filing just splits it between two returns rather than escaping it.

The bigger problem is what you give up. Filing separately eliminates:

The Earned Income Tax Credit entirely
The Child and Dependent Care Credit in most cases
Education credits, including the American Opportunity Credit and Lifetime Learning Credit, and the student loan interest deduction
The adoption credit in most cases

Other provisions get worse. The capital loss deduction drops from $3,000 to $1,500. The employer dependent care exclusion drops from $5,000 to $2,500. Social Security benefits may be taxed at a higher rate if the spouses lived together at any point in the year, and the credit for the elderly or disabled goes away. The AMT exemption is cut in half compared with a joint return.¹

Separate filing does help in a few specific situations. If one spouse has large medical expenses, filing separately lowers that spouse’s AGI floor and makes it easier to clear the 7.5%-of-AGI threshold for medical itemization. Some couples use it to keep one spouse’s income out of an income-driven student loan payment calculation. And a spouse can avoid joint liability for the other’s tax debt or questionable deductions by filing separately. Outside cases like these, joint filing almost always produces a lower combined bill.

If You’re Not Married

Two filing statuses sit between single and joint. Head of household applies to unmarried taxpayers who pay more than half the cost of maintaining a home and have a qualifying person living with them for more than half the year.⁵ The 2026 standard deduction is $24,150, and the brackets are wider than single but narrower than joint. A married taxpayer who lived apart from a spouse for the last six months of the year and maintained a home for a dependent child can also qualify under Section 7703(b).⁶

Qualifying surviving spouse status preserves joint brackets and the full $32,200 standard deduction for up to two years after a spouse’s death, provided you have a dependent child at home and haven’t remarried.⁷ When that window closes, the shift to head of household or single typically raises the tax bill even at the same income.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Rev. Proc. 2025-32
3
Office of the Law Revision Counsel. 26 U.S. Code 1411 – Imposition of Tax
4
Office of the Law Revision Counsel. 26 U.S. Code 3101 – Rate of Tax
5
Internal Revenue Service. Filing Requirements, Status, Dependents
6
Office of the Law Revision Counsel. 26 U.S. Code 7703 – Determination of Marital Status
7
Internal Revenue Service. Qualifying Surviving Spouse Filing Status