Last Updated: April 2026
The marriage bonus or penalty arises from how tax brackets are structured for married filing jointly (MFJ) versus single filers. When the MFJ brackets are exactly double the single brackets (which they are for most federal brackets), there is neither bonus nor penalty. When MFJ brackets are less than double the single brackets — as at the top of the federal schedule — a penalty applies for dual high-income couples.
This guide explains the 2026 federal marriage penalty/bonus, which states have the most severe penalties, and real examples showing when filing jointly saves money versus when it costs more.
When one spouse earns significantly more than the other, married filing jointly almost always produces a lower tax bill than two separate single returns:
Spouse A earns $120,000; Spouse B earns $0. As single: Spouse A in 22–24% brackets. As MFJ: $120,000 spread over wider MFJ brackets — 12% bracket extends to $94,300 (vs $47,150 single). The couple saves approximately $3,500–$5,500 in federal income tax versus filing as two singles.
Spouse A earns $150,000; Spouse B earns $40,000. As two singles: A pays ~$28,000 federal; B pays ~$4,000 federal = $32,000 combined. As MFJ ($190,000 total): approximately $31,000 federal. Marriage bonus: ~$1,000. The bonus shrinks as incomes converge.
The MFJ standard deduction ($29,200 in 2024) is exactly double the single deduction ($14,600). For a couple where neither itemises, the MFJ standard deduction provides the same proportional deduction as two single returns — no bonus or penalty here.
When both spouses earn similar high incomes, married filing jointly can cost more than filing as two singles:
Both spouses earn $400,000 each ($800,000 combined). As two singles: each would be just below the 37% bracket ($578,125 for 2024). As MFJ: $800,000 triggers the 37% bracket ($731,200 threshold for MFJ). Penalty: a portion of income is pushed into 37% that would not have been as singles. Estimated penalty: approximately $10,000–$20,000/year depending on deductions.
The 3.8% Net Investment Income Tax applies above $200,000 (single) but only $250,000 (MFJ) — not $400,000 as you might expect. This means dual-earner couples with investment income face a larger share of NIIT than two singles earning the same total.
The Alternative Minimum Tax exemption for MFJ ($137,000 in 2024) is less than 2× the single exemption ($85,700 × 2 = $171,400). Dual-income AMT-exposed couples pay more.
States create their own penalties when MFJ brackets are narrower than double the single brackets:
In most cases, married filing jointly (MFJ) is better — or at worst neutral. Married filing separately (MFS) is generally worse because:
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Marriage tax planning — joint vs separate filing analysis, income-splitting strategies, student loan IDR calculations, and state-level impact — is complex and personal. Get matched with a CPA who can model your specific numbers.
⚠ Not for simple single-state returns. Free filing is fine for straightforward W-2 situations.
Get Matched With a CPA →It depends on your income and your spouse's income. One-earner couples almost always pay less tax after marriage (marriage bonus). The single-earner benefit is largest when one spouse earns significantly more than the other. Dual-income couples where both earn similar moderate incomes may see minimal change. Dual high-income couples where both earn above $400,000 may pay more (marriage penalty). On balance, the TCJA 2017 reduced marriage penalties at most income levels — most couples either save or pay the same amount by filing jointly.
It varies by income combination. Rule of thumb examples: (1) One earner at $80,000, spouse $0: saves approximately $2,300–$3,500 per year versus two singles. (2) Two earners at $60,000 each ($120,000 combined): approximately $0–$500 savings — near neutral. (3) One earner $200,000, spouse $30,000: saves approximately $1,500–$3,000. (4) Both earners at $300,000 ($600,000 combined): small penalty of approximately $1,500–$4,000. (5) Both earners at $500,000: penalty of approximately $15,000–$25,000. The calculator on our homepage can model your specific combination.
Historically, states like New Jersey and California have had significant marriage penalties for dual high-income couples. New Jersey's top 10.75% rate and bracket structure creates meaningful marriage penalties. California's 13.3% surcharge for income above $1M applies at $1M for married couples rather than $2M — identical to the single threshold at the top — creating a dollar-for-dollar penalty at top incomes. Iowa previously had one of the worst penalties but has moved to a flat tax. Overall, high-tax states with multiple income brackets and top rates that don't scale proportionally with MFJ status create the most severe marriage penalties.