How this instrument works
The 2024 US federal income tax runs on seven rungs for a single filer: 10% on the first $11,600, 12% on the next slice up to $47,150, 22% up to $100,525, 24% up to $191,950, 32% up to $243,725, 35% up to $609,350, and 37% on anything past that. The design is deliberate — each rung only taxes the earnings that fall inside it, so a dollar that already cleared the 10% band keeps that lower rate forever, no matter how high total income later climbs. Stack all seven pieces and the result is the tax owed; there is no single flat percentage applied to the whole figure.
This calculator is built for the moment someone needs to know what a specific change in income actually costs or saves: an employee weighing whether a raise or a signing bonus is worth accepting, a freelancer setting aside money for quarterly estimated payments, or a household deciding how much more to route into a pre-tax 401k before the next rung starts. The most common misreading it corrects is the belief that crossing into a higher bracket taxes everything at the new, higher rate — it does not. Only the income earned inside that new rung sees the new rate; every dollar earned below it is untouched, which is why a raise can never shrink take-home pay on its own.
What the sheet does not do matters as much as what it does. It takes taxable income as a direct input, not gross salary — the 2024 standard deduction alone removes $14,600 for a single filer before this math even starts. It ignores payroll tax (Social Security and Medicare withholding), any state or local income tax, and tax credits, which reduce a bill after this arithmetic is finished rather than during it. And the seven thresholds shown are single-filer figures for 2024 only; joint filers, heads of household, and every later tax year use different numbers entirely.
- Enter your figure into Taxable income, $ (2024 US single filer) — income after deductions, not the number on a pay stub.
- Read Federal tax owed, $ for the total built by stacking every rung below your figure.
- Check Marginal tax bracket, % to see the rate on your next dollar earned, not an average of all seven rates.
- Scan Bracket 1 subtotal through Bracket 6 subtotal to see exactly how much tax accrues inside each individual rung before the next one begins.
Worked example — $80,000 in taxable income
Take $80,000 of 2024 taxable income for a single filer. The first $11,600 is taxed at 10%, adding $1,160, so Bracket 1 subtotal reads $1,160. The next $35,550, up to $47,150, is taxed at 12%, adding $4,266, which brings Bracket 2 subtotal to $5,426. The remaining $32,850 sits inside the third bracket and is taxed at 22%, adding $7,227 — and because $80,000 never reaches $100,525, Bracket 4 subtotal through Bracket 6 subtotal add nothing further.
Add the three pieces and Federal tax owed, $ reads $12,653.00, an effective rate of about 15.8% of the full $80,000. Marginal tax bracket, % reads 22%, the rate on that last dollar earned — not an average of the 10%, 12%, and 22% this income actually passed through. Assuming the whole $80,000 was taxed at 22% would put the estimate near $17,600, overstating the real bill by about $4,947.
Questions
Will a raise push me into a higher bracket and shrink my take-home pay?
No. Only the earnings that fall inside the new, higher bracket are taxed at its rate — every dollar you already earned keeps the lower rate it was always taxed at. A raise that crosses a bracket line adds a slightly higher rate to just the new slice of income, so total take-home pay always rises with a raise, never falls, no matter which rung it lands in.
What is the difference between my marginal rate and my effective rate?
Marginal rate is the rate charged on the next dollar you earn, set by whichever bracket your income has reached. Effective rate is total tax divided by total income, blending every lower bracket the money already passed through on the way up. On $80,000 of taxable income the marginal rate is 22% but the effective rate is roughly 15.8%, since most of that income was taxed at 10% and 12% first.
Why does the calculator ask for taxable income instead of my salary?
Taxable income is what remains after the standard or itemized deduction is subtracted from wages, so it sits below the figure on an offer letter or pay stub — the 2024 standard deduction alone removes $14,600 for a single filer. Entering gross salary instead of taxable income pushes every bracket subtotal, and the final tax owed, above the true bill.
Do these seven brackets apply to every filing status?
No, the thresholds built into this instrument are the 2024 single-filer schedule only. Married couples filing jointly use thresholds close to double the single-filer amounts through most rungs, and heads of household use a third, wider set, so identical taxable income lands in a different bracket and owes a different tax under either status.
Why do the bracket thresholds change every year?
The IRS re-indexes every threshold to inflation annually so a fixed dollar figure does not quietly drift a filer into a higher bracket purely because wages rose with prices, a shift known as bracket creep. The $11,600, $47,150, and other ceilings used here are the 2024 figures specifically; expect each one to move again for 2025 and every year after.
Does this figure include payroll tax or state income tax?
No. This instrument computes only the federal income tax built from the seven bracket rates shown, not Social Security or Medicare withholding, which is a separate flat-rate payroll tax, and not any state or local income tax, which runs on its own separate schedule. Add those on top to estimate the full tax drawn from a paycheck.
References
Read this first: This instrument shows arithmetic, not advice. Real offers add fees, taxes and terms that vary by lender and place — verify the figures against your actual paperwork before deciding anything.