Married Filing Jointly Income Tax by State (2026)

How the Marriage Penalty Arises

A state has a marriage penalty in its bracket structure when the joint-filer bracket thresholds are not at least double the single-filer thresholds. The penalty falls on similar-earner couples: two filers each earning $80,000 single would each face the brackets up to $80,000, but as a joint filer with $160,000 of combined income they may be pushed into a higher bracket on dollars that singly would have been below it.

The opposite of a marriage penalty is a marriage bonus, which arises when joint brackets are more than doubled relative to single brackets. The federal income tax has small marriage bonuses at low- and moderate-income bands and a marriage penalty at very high incomes (the 37% bracket kicks in at $751,600 joint vs $626,350 single, less than doubled). At the state level the patterns vary.

For flat-tax states, no penalty exists by structure: the rate is the same regardless of filer count or combined income. This is one of the under-appreciated arguments for flat-tax states for two-earner couples (Mississippi, North Carolina, Pennsylvania, Indiana, Illinois). For graduated states without doubled brackets, two-earner couples can face several percentage points of additional effective tax on the doubled-up income.

The 50-State (plus DC) MFJ Map

2026 top marginal rate, MFJ top bracket threshold, and whether MFJ brackets are doubled relative to single. "Doubled" means joint-filer thresholds are at least 2x single-filer thresholds.

Sources: each state's 2026 published bracket tables (CA Franchise Tax Board, NY DTF, NJ Division of Taxation, etc.). Verified against the Tax Foundation 2026 State Individual Income Tax Rates and Brackets summary.

The Worst Marriage Penalty States in 2026

Among the graduated-rate states that do not double brackets, the worst penalties affect similar-earner couples in the upper-middle income bands. The penalty is calculated as the difference between (a) the combined tax two filers would owe filing singly and (b) the tax owed as MFJ.

New Jersey is one of the more visible cases. The 6.37% bracket for single filers starts at $40,000 of taxable income; for MFJ it starts at $50,000 (not $80,000). Two filers each earning $40,000 face no 6.37% bracket as singles, but combined as MFJ the dollars from $50,000 to $80,000 are taxed at 6.37%, producing additional state tax of approximately $1,910. The penalty grows in dollar terms with income.

Other notable penalty states: Delaware (single brackets used for MFJ), Missouri, Ohio, Rhode Island, South Carolina, Virginia (compressed brackets, small effect) and West Virginia. DC has the same brackets for single and joint filers, producing a meaningful penalty above $400,000 combined income.

For couples whose earnings differ substantially (one spouse high, one low or zero), the penalty inverts to a bonus: combining a $200,000 earner with a $20,000 earner under MFJ pulls the higher-earner's top dollars into a bracket at the lower-earner's effective rate, saving tax versus filing as two singles. The marriage-bonus side of the math is structural to graduated systems and exists in most states regardless of bracket-doubling.

Worked Example: $200K Combined, Two Earners, Three States

Couple A and B each earn $100,000. Combined $200,000. Compare MFJ liability in three states:

Numbers are state-only and exclude federal, FICA and local taxes. NJ MFJ penalty exists for similar-earner couples; for unequal-earner couples NJ MFJ produces a small bonus instead.

State-Federal Filing-Status Linkage

Most states require the state filing status to match the federal filing status. If you file MFJ federally, you file MFJ on the state return. The exceptions are limited and include some states allowing different filing-status election where one spouse is a non-resident or where allocating community-property income differently produces a better outcome.

Per the IRS Publication 17, the federal MFJ election is binding on most state returns. A few states allow a married couple to file separately on the state return even when filing MFJ federally; this is particularly relevant in some community-property states or where one spouse has substantial state-specific deductions. CA Franchise Tax Board permits filing separately on the same return (MFS filing on California Form 540) where federal MFJ was elected, in limited circumstances.

For most filers the state filing status follows federal. The practical consequence: if you are weighing whether MFJ saves or costs you tax overall, both federal and state need to be modelled together. Tax software handles this automatically; manual filers should compute both ways before deciding.