π Marriage Tax Calculator
Joint return vs two single returns: bonus, penalty, or a wash?
Joint vs Two Single Returns
Estimates for planning only, not financial advice. Federal income tax only, 2026 brackets, standard deduction, no credits.
How to Use This Calculator
Enter each spouse gross income. The calculator computes what each would owe filing as single and what you owe together filing jointly, using the 2026 federal brackets and standard deductions. The difference is your marriage bonus (joint is cheaper) or marriage penalty (joint costs more).
Enter Spouse A Income and Spouse B Income as gross annual amounts before any deductions.
The calculator taxes each income as a single filer with the $16,100 standard deduction and adds the two bills together.
It then taxes the combined income as married filing jointly with the $32,200 standard deduction.
Read the verdict: a bonus means marriage saves you money on federal tax, a penalty means it costs you, and near zero means it is a wash.
Why Bonuses and Penalties Happen
The joint brackets are exactly double the single brackets through 32 percent, so most couples see no penalty from rates alone. Bonuses arise when one spouse earns little: joint filing drags the high earner income down into wider, lower brackets. Penalties arise at the very top, where the 35 and 37 percent joint brackets are narrower than double the single ones, and in credit phase-outs that are not doubled.
Worked Examples
Bonus case: Spouse A earns $200,000 and Spouse B earns $0. As singles, A owes $36,734 and B owes $0, for $36,734 total. Jointly, taxable income is 200000 - 32200 = $167,800, and the joint tax is $26,340. Marriage saves $10,394. Wash case: each earns $100,000. Singles pay $13,170 each ($26,340 total); jointly the tax is also $26,340, a perfect wash. Penalty case: each earns $500,000. Singles pay $138,134.25 each ($276,268.50 total); jointly the tax is $280,250.50, a $3,982 penalty from the non-doubled top brackets.
Planning Around the Result
You cannot choose your filing status to dodge the outcome: married couples must file jointly or as married filing separately, and separately is usually worse. What you can control is timing: bunching deductions, Roth conversions in low-income years, and managing capital gains around the top-bracket thresholds. If the calculator shows a penalty, look at credits and state taxes next, because those often matter more than the bracket math.
Estimates for planning only, not financial advice.
Frequently Asked Questions
What is the marriage bonus and the marriage penalty?
Compare the couple tax as married filing jointly against the sum of what each would pay as a single filer. If the joint return is cheaper, that is the marriage bonus; if it costs more, that is the marriage penalty. The 2026 joint brackets are exactly double the single brackets through the 32 percent bracket, which wipes out most penalties for middle incomes.
Who gets a marriage bonus?
Couples with very unequal incomes get the biggest bonus: the higher earner income gets spread across the wider joint brackets, pulling dollars out of high single brackets. A $200,000 earner married to a non-earner pays $26,340 jointly versus $36,734 as a single filer, a $10,394 bonus. Single-earner households are the classic bonus winners.
Who pays a marriage penalty?
High-earning couples with similar incomes can pay a penalty, because the top joint brackets are not fully doubled: the 35 percent bracket tops out at $768,700 jointly versus $640,600 single. Two $500,000 earners pay $280,250.50 jointly versus $276,268.50 as two singles, a $3,982 penalty. Below those heights, equal earners usually break even.
Does the standard deduction cause a penalty?
Not anymore at the federal level. The 2026 joint standard deduction of $32,200 is exactly double the $16,100 single amount, so the deduction itself is neutral. Penalties today come almost entirely from the top brackets and from phase-outs of credits and deductions that are not doubled for joint filers.
Should we file jointly or separately?
For the vast majority of couples, jointly wins: you get the doubled brackets, the full standard deduction, and access to credits that married filing separately loses, like education credits and the full IRA deduction. Filing separately helps mainly in narrow cases, such as one spouse with large medical deductions or income-based student loan payments.
What does this calculator leave out?
It models federal income tax with the 2026 brackets and standard deductions only, with no adjustments, itemized deductions, or credits. Real-world bonuses and penalties also come from the Child Tax Credit phase-outs, the net investment income tax thresholds, Social Security taxation, and state taxes, which can shift the answer in either direction.