Updated June 16, 2026 · 6 min read
When you're married, you usually choose between married filing jointly (MFJ) and married filing separately (MFS). For the large majority of couples, filing jointly costs less tax — it has the widest brackets, the largest standard deduction ($32,200 in 2026), and unlocks credits that MFS blocks. Filing separately wins in a handful of specific situations. Here's the comparison and when each makes sense.
Joint filers get brackets that are roughly twice as wide as a single filer's, so more household income is taxed at lower rates before hitting the higher ones. Here's how a $120,000 joint income is taxed after the 2026 standard deduction:
How $120,000 of income is taxed — married filing jointly, 2026 brackets
| Rate | Income taxed here | Tax |
|---|---|---|
| 10% | $24,800 | $2,480 |
| 12% | $63,000 | $7,560 |
Total federal income tax: $10,040. Your marginal rate is 12% (the top bracket), but your effective rate is just 8.4% — because only the top slice is taxed at the top rate.
Filing separately splits that income across two narrower (single-like) bracket schedules and usually pushes more of it into higher rates.
| Filing jointly | Filing separately | |
|---|---|---|
| Standard deduction | $32,200 | $16,100 each |
| Bracket width | Widest | Narrower (single-like) |
| Most tax credits | Available | Often reduced or disallowed |
| Liability for the return | Both spouses jointly | Each spouse only their own |
| Typical result | Lower total tax | Higher tax, with exceptions |
Calculate your tax both ways and compare the totals — most tax software does this automatically. Unless one of the specific separate-filing situations applies, joint almost always produces the lower combined bill.
For most couples, filing jointly results in a lower total tax bill because of wider brackets, a larger standard deduction, and access to more credits. Filing separately is better only in specific cases, such as income-driven student loan repayment or liability concerns.
The 2026 standard deduction is $32,200 for married filing jointly, versus $16,100 each for married filing separately.
Filing separately can help when it lowers income-driven student loan payments, when one spouse has large medical expenses relative to their income, or when a spouse wants to avoid liability for the other's taxes. It usually costs more overall.
Often, yes. Married filing separately reduces or eliminates several credits and deductions, including the Earned Income Credit, most education credits, and the full IRA deduction.
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