Tax BracketsFederal income tax on $40,000 of taxable income
On taxable income of $40,000 a single filer owes $4,552 in 2026 (11.4% of it) and $4,544 in 2027, before credits. The marginal rate, the rate on the next dollar, is 12% in 2026.
By filing status
| Filing status | 2026 tax | Marginal rate | 2027 tax | Marginal rate |
|---|---|---|---|---|
| Single | $4,552 | 12% | $4,544 | 12% |
| Married filing jointly | $4,304 | 12% | $4,288 | 12% |
| Married filing separately | $4,552 | 12% | $4,544 | 12% |
| Head of household | $4,446 | 12% | $4,435 | 12% |
What this tells you
- Taxable income is after the standard deduction (single 2026: $16,100). A gross income of $56,100 becomes $40,000 of taxable income for a single filer.
- The 2027 tax is $8 less than 2026 for a single filer, because the bracket limits were raised for inflation.
- This is income tax only; credits, Social Security, Medicare and state tax are separate.
Common questions
How much federal income tax on $40,000 of taxable income?
For a single filer in 2026: $4,552; for married filing jointly: $4,304 (before credits).
Sources
- Tax year 2027: Internal Revenue Service, Revenue Procedure 2026-35, released 5 November 2026 (irs.gov): rate schedules (section 3.01), maximum capital gains rate amounts (3.03), alternative minimum tax (3.11) and standard deduction (3.15).
- Tax year 2026: Internal Revenue Service, Revenue Procedure 2025-32 (irs.gov) and the IRS news release on the 2026 inflation adjustments (irs.gov).
- Both PDFs were downloaded and read on 13 November 2026. Every table was checked: the cumulative tax of each bracket in the official table equals the tax computed from the lower brackets, to the cent.
Figures from the IRS revenue procedures read on 13 November 2026. The tax year 2027 figures were released on 5 November 2026 and the revenue procedure itself says later legislation may change them. This site is independent, not connected with the IRS, and gives arithmetic, not tax advice.