Projected — not yet official
2027 Tax Brackets for Married Filing Separately (Projected)
The IRS has not announced 2027 brackets yet. The bands below are the statutory indexing formula applied to published BLS data, shown next to the confirmed 2026 bands for married taxpayers filing separately. For the figures you file with now, see the 2026 tax brackets for married taxpayers filing separately.
2026 (confirmed) vs 2027 (projected)
| Rate | 2026 taxable-income band | 2027 band (projected) | Band ceiling rises by |
|---|---|---|---|
| 10% | $0 to $12,400 | $0 to $12,775 | $375 |
| 12% | $12,401 to $50,400 | $12,776 to $51,950 | $1,550 |
| 22% | $50,401 to $105,700 | $51,951 to $108,975 | $3,275 |
| 24% | $105,701 to $201,775 | $108,976 to $208,075 | $6,300 |
| 32% | $201,776 to $256,225 | $208,076 to $264,225 | $8,000 |
| 35% | $256,226 to $384,350 | $264,226 to $396,325 | $11,975 |
| 37% | Over $384,350 | Over $396,325 | — |
2026: IRS Rev. Proc. 2025-32 — confirmed. 2027: IRC § 1(j) formula on BLS C-CPI-U through August 2026 — PROJECTED, not official.
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Projected 2027 deductions for married taxpayers filing separately
Standard deduction (projected)
$16,600
$16,100 in 2026
Extra per condition, 65+ or blind
$1,700
$1,650 in 2026
Only taxable income above the deduction reaches the brackets. The standard deduction and the 65+/blind amount are projected from § 63(c) with the same BLS data; the senior deduction is a fixed statutory amount for 2025 through 2028. See the standard deduction 2027 reference for every filing status.
Methodology
Each 2018 threshold in IRC § 1(j)(2) is multiplied by the § 1(f)(3) cost-of-living ratio (2016 prices for the two lowest ceilings, 2017 for the rest) and the increase is rounded down to the statutory step. The same code reproduces every 2026 threshold in Rev. Proc. 2025-32. The October 2025 index was never published; this page interpolates it. Leaving it out would raise 6 of these thresholds by $25 to $500.
Other filing statuses
Frequently asked questions
What are the 2027 tax brackets for married taxpayers filing separately?
Projected, not yet official: married taxpayers filing separately keep the seven rates from 10% through 37% in 2027, with the 10% band ending at $12,775 and the 37% rate starting above $396,325 of taxable income. The projected standard deduction is $16,600, up from $16,100 in 2026.
Are these 2027 brackets for married taxpayers filing separately official?
No. The IRS sets 2027 thresholds in its annual inflation-adjustment revenue procedure, usually published in October or November (the 2026 figures came from Rev. Proc. 2025-32). Until then this page runs the statutory formula in IRC § 1(f) and § 1(j) on published BLS chained CPI-U data through August 2026, about 3.06% above the 2026 adjustment. The page switches to the IRS figures the day they are published.
What is the projected 2027 standard deduction for married taxpayers filing separately?
$16,600, against a confirmed $16,100 for 2026. Each qualifying condition — 65 or older, or blind — is projected to add $1,700 ($1,650 in 2026).
Why could the official 2027 thresholds differ from this projection?
BLS never published the October 2025 index, and no agency has said how the twelve-month average should treat the gap. This page fills it with the midpoint of September and November. Leaving October out instead would raise 6 of the thresholds for married taxpayers filing separately by $25 to $500, for example the top of the 10% band to $12,800 instead of $12,775. The IRS revenue procedure settles it.
Will I pay less tax in 2027 on the same income as married filing separately?
Usually a little, if your income does not rise. Every bracket ceiling and the standard deduction move up with inflation, so more of the same income is taxed at the lower rates. The rates themselves do not change: OBBBA made the 10/12/22/24/32/35/37% schedule permanent.
Sources
Related Calculators
Tax Brackets 2027 (Projected)
Projected 2027 federal tax brackets for every filing status (computed from BLS CPI data, not official) — see how the 10%/12% one-time OBBBA bump does not repeat
Standard Deduction 2027 (Projected)
Projected 2027 amounts for all five filing statuses (computed from BLS CPI data, not official), plus the OBBBA senior bonus deduction, which is fixed by statute
Federal Income Tax Calculator
10–37% brackets, $16,100 standard deduction, progressive calculation
Tax Bracket Finder
Find your 2025 or 2026 marginal bracket, effective rate, taxable income, and room before the next bracket