Federal Income Tax Calculator (2026)

How federal income tax works in 2026

Federal income tax is progressive. You do not pay your top rate on every dollar. Income fills the 10% band first, then 12%, then 22%, and so on. That is why two people with the same “tax bracket” label can owe very different amounts once deductions and credits enter the picture.

This calculator starts from adjusted gross income (AGI), subtracts the standard deduction (or your itemized override when it is larger), then applies the ordinary-income brackets for the tax year you select. Preferential capital gains stacking and most credits are intentionally out of scope here—use the dedicated capital gains, child tax credit, and EITC tools for those pieces.

Think of the return as a funnel. Broad income enters at the top. Adjustments carve AGI. The standard or itemized deduction carves taxable income. Brackets turn taxable income into a tax before credits. Credits (child tax credit, education credits, foreign tax credit, and many others) then reduce what you actually owe. This page focuses on the middle of that funnel: AGI → deduction → ordinary tax.

2026 federal tax brackets (taxable income)

These upper bounds come from IRS inflation adjustments for tax year 2026 (Rev. Proc. 2025-32 / IRS newsroom IR-2025-103):

Married filing separately generally mirrors half of the joint schedule for many ordinary brackets, with important exceptions elsewhere on the return (student loan interest, some credits). Qualifying surviving spouse usually uses joint amounts for two years after a spouse’s death when the rules are met.

Standard deduction vs itemizing in 2026

For tax year 2026 the standard deduction is $16,100 (single / MFS), $24,150 (head of household), and $32,200 (joint / qualifying surviving spouse). Extra amounts apply if you are age 65 or older or blind. Those higher floors mean fewer households itemize than before the TCJA-era redesign—but high property tax, large mortgage interest, or bunched charitable gifts can still tip the scale.

If you itemize, remember SALT is capped (enter the statutory cap that applies to your year in the SALT tool), medical expenses generally only count above 7.5% of AGI, and mortgage interest is limited by acquisition indebtedness rules. Run the standard vs itemized calculator or the Schedule A calculator before you assume either path.

How to calculate your estimate

Step 1 — Start with AGI

Pull AGI from a recent pay stub projection, last year’s Form 1040, or a worksheet that already nets above-the-line adjustments (educator expenses, HSA contributions, half of self-employment tax, and so on). If you only know gross salary, subtract traditional 401(k) and HSA deferrals first so you do not overstate tax.

Step 2 — Subtract the deduction you will actually use

Most filers take the standard deduction. If mortgage interest, allowable SALT, charity, and medical expenses above the AGI floor clearly exceed the standard amount, enter that itemized total in Advanced options.

Step 3 — Read the bracket trace

The results panel lists each bracket slice. That trace is the same style of math the IRS tax tables approximate—useful when you are deciding whether a Roth conversion or bonus will push meaningful dollars into the next band.

Step 4 — Separate FICA from income tax

Optional FICA preview shows employee Social Security and Medicare on wages. That is not income tax. Self-employed people owe SE tax instead—use the self-employment tax calculator.

Worked example (single, 2026)

Assume $75,000 AGI, single, no aged/blind extras, standard deduction only:

• Standard deduction: $16,100
• Taxable income: $58,900
• Tax fills 10% through $12,400, 12% through $50,400, and 22% on the remainder through $58,900

Run the same inputs in the form above to see the exact cent-level breakdown. Then toggle the FICA preview if those wages are also subject to Social Security and Medicare. For a joint household at $150,000 AGI with the $32,200 standard deduction, taxable income is $117,800—still mostly in the 12% and 22% bands on the joint schedule, not “in the 22% bracket on every dollar.”

Marginal rate, effective rate, and planning moves

Your marginal rate answers “what happens to the next dollar?” Your effective rate answers “what share of AGI did federal income tax take?” A household can sit in the 24% bracket and still show a mid-teens effective rate because earlier dollars were taxed at 10% and 12%.

That distinction matters for Roth conversions, taxable bond interest, and side-gig income. A conversion that stays inside the 12% band can be cheaper than one that floods the 22% or 24% band. Use the Roth conversion calculator and the tax year comparison tool when you are timing income across 2025 and 2026.

What this calculator does not do

• Apply the child tax credit, EITC, education credits, or premium tax credit
• Stack long-term capital gains and qualified dividends in preferential bands
• Compute alternative minimum tax, NIIT, or Additional Medicare Tax beyond the optional FICA preview
• Prepare Form 1040 or state returns

Those limits are intentional. Narrow engines with clear assumptions beat a black-box “total tax” number that hides half the story.

Common mistakes

• Confusing paycheck withholding with annual liability—bonuses withheld at supplemental rates often create a refund or balance-due surprise.
• Entering gross wages when you meant AGI after 401(k) and HSA deferrals.
• Ignoring the Additional Medicare Tax once wages cross $200,000 (single) or $250,000 (joint).
• Applying the top marginal rate to all income instead of stacking brackets.
• Forgetting filing status changes after marriage, divorce, or a dependent aging out.

Withholding, estimates, and year-end cleanup

If the annual estimate and your projected withholding disagree, fix the gap with Form W-4 extra withholding or estimated payments—not by hoping April works out. The W-4 withholding calculator turns a projected gap into a per-paycheck extra. The quarterly estimated tax calculator covers freelancers and households with large nonwage income.

Late in the year, check year-to-date Social Security wages against the $184,500 2026 wage base. Once you clear the base, employee Social Security withholding should stop even though Medicare continues.

Planning angles worth checking next

If take-home pay is the real question, open the paycheck calculator. If you are comparing offers across states, pair this tool with the state income tax calculator or the job offer comparison. For retirement deferrals that lower AGI, see the 401(k) calculator and the contribution limits maximizer.

For a refund-oriented view that layers withholding against estimated liability, use the tax refund estimator. For investment sales, jump to the capital gains tax calculator.

Filing status choices that change the math

Single, married filing jointly, married filing separately, head of household, and qualifying surviving spouse are not cosmetic labels. They change standard deduction amounts, bracket widths, and eligibility for credits this page does not compute. Head of household can be valuable when you pay more than half the cost of keeping up a home for a qualifying person—but the tests are specific. Married filing separately often closes doors (student loan interest, some education credits) even when it looks attractive on a narrow bracket chart.

If your marital status or household changed mid-year, do not rely on last year’s mental model. Re-run this calculator, then reconcile withholding with the W-4 tool before the next payroll cycle.

Inflation adjustments and why 2025 vs 2026 differs

Each year the IRS publishes inflation adjustments that move bracket thresholds and the standard deduction. For 2026 those figures arrived in Rev. Proc. 2025-32 (newsroom IR-2025-103), including interactions with legislation sometimes called OBBBA in planning materials. The tax year comparison page reruns identical AGI through both datasets so you can see the mechanical effect of those table moves without changing your life facts.

Inflation adjustments do not automatically mean “everyone pays less.” A raise that outruns bracket COLA can still increase tax. The useful question is whether your taxable income landed in a different slice of the schedule—not whether the news said brackets “went up.”

Credits, AMT, and other layers to add later

After ordinary tax, many households subtract nonrefundable credits and may claim refundable credits. The child tax credit calculator and EITC calculator cover two of the largest family credits. Investment households should check the NIIT calculator once MAGI and net investment income clear the statutory floors. Equity-heavy years may need the AMT calculator.

None of those replace this ordinary-tax engine; they sit on top of it. Build the base liability here, then layer specialized tools instead of forcing one form to answer every question badly.

Above-the-line adjustments before taxable income

AGI is not gross wages. Educator expenses, HSA deductions, self-employed health insurance, half of self-employment tax, and traditional IRA contributions (when deductible) sit above the line on Schedule 1. Each dollar of adjustment reduces AGI before the standard or itemized deduction applies—sometimes keeping more income in a lower bracket than a naive gross-wage estimate suggests.

Retirement deferrals through a 401(k) usually reduce wages on the W-2 rather than appearing as a separate Schedule 1 line, but the effect is the same: lower AGI. If you only know gross salary, subtract elective deferrals and cafeteria plan amounts before you enter AGI here. The 401(k) calculator and HSA calculator help translate deferral choices into AGI movement.

Second worked example (married filing jointly, 2026)

Two earners, combined $180,000 AGI after $30,000 total traditional 401(k) deferrals, married filing jointly, standard deduction:

• Standard deduction: $32,200
• Taxable income: $147,800
• Ordinary tax fills 10%, 12%, and 22% bands heavily—most dollars never touch 24%
• Marginal rate on the next dollar of ordinary income may be 22% or 24% depending on exact AGI

Add $15,000 of long-term capital gains and the story splits: ordinary tax stays on the $147,800 stack, but preferential gain rates apply separately in the capital gains tax calculator. This federal tool does not merge those paths automatically.

When to itemize despite the high standard deduction

The 2026 standard deduction is large—$32,200 joint—so itemizing requires substantial deductible spending. High state and local tax (subject to the federal SALT cap), mortgage interest on large acquisition debt, disaster losses, and bunched charitable gifts are the usual triggers. Medical expenses only count above 7.5% of AGI, which filters out most routine care unless the year included surgery or long-term care.

Run the standard vs itemized calculator when you are close. Itemizing on Schedule A also affects state returns in many states that start from federal itemized amounts.

Taxable income vs AGI on Form 1040

AGI appears on line 11; taxable income on line 15 after standard or itemized deduction. Brackets apply to taxable income, not AGI. Credits often reference AGI or MAGI for phaseouts. Keep the three concepts separate when reading results from this tool versus credit calculators.

Sources and methodology

Ordinary brackets and standard deductions follow IRS Rev. Proc. 2025-32 as summarized in the IRS 2026 inflation newsroom release. Social Security wage-base figures in the optional FICA preview follow SSA’s 2026 contribution and benefit base ($184,500). Money is tracked in integer cents. Every result includes a calculation trace so you can see how each band was filled—not just a single headline tax number. Confirm final IRS instructions and Publication 17 before you file.