Income Tax Calculator
Separate your marginal bracket from the rate you actually pay — the two differ by a factor of nearly two, and almost every tax decision is made on the wrong one.
Income Tax Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Results are a model, not a quotation — an institution's own figures govern.
- Every input is an assumption; change one and the answer changes with it.
- Rounding is applied only at the display layer, so totals may differ by a cent from a statement that rounds each line.
In short: On $95,000 of gross income with a $6,000 401(k) deferral, federal tax is $11,421 — an effective rate of 12.02% on gross, despite sitting in the 22% bracket. The marginal rate overstates what you pay by 1.83 times, though it remains the correct rate for pricing any additional dollar.
Formula
Brackets are marginal: each rate applies only to the income inside its band. Nobody pays their bracket rate on their whole income.
Worked Example
- Reduce for pre-tax items. $95,000 − $6,000 of 401(k) = $89,000 of AGI.
- Apply the deduction. $89,000 − $14,600 = $74,400 taxable.
- Fill the brackets. 10% on $11,600, 12% on $35,550 and 22% on $27,250 gives $11,421.
- Divide by gross. $11,421 ÷ $95,000 = 12.02% effective, against a 22% bracket.
- Add FICA. $7,267.50 brings the total federal burden to $18,688.50 — 19.67%, and FICA is 38.9% of it.
Analyst's note. The marginal-versus-effective confusion drives more bad financial decisions than any other tax misunderstanding, and it runs in both directions. Quoting 22% overstates the actual burden by 1.83 times, which makes people believe their tax position is worse than it is. But the marginal rate is the correct rate for pricing any incremental decision — a raise, a side income, a deductible contribution. Use effective to understand what you pay; use marginal to decide what to do next. Note too that FICA is 38.9% of the total federal bill here and is not reduced by 401(k) deferral at all.
Strengths & Limits Of This Model
Where this engine is strong
- Runs entirely in your browser — no figure you type is transmitted or stored.
- Shows the full working, so every number can be traced and challenged.
- Free, unmetered and free of affiliate incentives.
Where it stops
- Generalised assumptions cannot capture every individual circumstance.
- Jurisdiction-specific rules and mid-year changes may not be reflected.
- A model output is not a substitute for a professional review of your position.
Practical Use Cases
Understanding what you actually pay
The effective rate is the honest headline number. At 12.02% on gross it is well below the bracket most people would quote, and it is the figure to use when comparing your position across years.
Pricing a raise or a side income
Additional income is taxed at the marginal rate, 22% here, plus FICA. Use the marginal figure — never the effective one — when evaluating extra work. The Raise Calculator handles the inflation side of the same question.
Valuing a pre-tax contribution
A 401(k) or HSA deferral saves tax at your marginal rate, so $6,000 saves $1,320 here. It does not reduce FICA. Project the compounded value with the 401k Calculator.
Methodology & Editorial Standards
The engine applies 2024 federal single-filer brackets to taxable income after pre-tax deductions and the standard or itemised deduction, then subtracts credits from the computed tax. Credits are treated as non-refundable, so tax is floored at zero rather than going negative — refundable credits such as the Earned Income Credit can produce a payment beyond withholding and are not modelled. FICA is applied to gross wages with Social Security capped at the $168,600 wage base and Medicare uncapped; the 0.9% Additional Medicare Tax above $200,000 is not applied. Pre-tax retirement deferrals reduce income tax but not FICA, which the engine reflects. State tax, the Alternative Minimum Tax, the Net Investment Income Tax, self-employment tax and phase-outs of deductions and credits are outside scope. This is an estimate for planning, not tax advice. The engine implements the standard published formula for this calculation. Inputs are validated for domain and sign before evaluation, and any undefined case returns an em-dash rather than a spurious value.
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Income Tax Calculator — 20 Expert FAQs
20 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
What is the difference between marginal and effective tax rate?
Marginal is the rate on your next dollar — 22% here. Effective is total tax divided by gross income — 12.02%. The bracket overstates what you pay by 1.83 times, because lower rates apply to the income beneath it.
Does being in the 22% bracket mean I pay 22%?
No. Only the income inside that band is taxed at 22%. Here $11,600 is taxed at 10%, $35,550 at 12% and just $27,250 at 22%. The blended result is 12.02% of gross.
Which rate should I use for decisions?
Marginal, always, for anything incremental — a raise, overtime, a side income or a deductible contribution. Effective is a descriptive statistic about the year as a whole; it never prices a decision correctly.
Does a raise ever leave me worse off?
No. Only the portion above the threshold is taxed at the higher rate, so crossing a bracket can never reduce take-home. Benefit cliffs and credit phase-outs can, but the bracket system itself cannot.
How much tax does a 401(k) contribution save?
Your marginal rate multiplied by the contribution — $1,320 on $6,000 here. It saves income tax only; FICA is still charged on the full gross, which surprises most contributors.
Is FICA included in my tax rate?
Not in the income tax figure, but it should be in your thinking. FICA is $7,267.50 here, 38.9% of the total federal burden of $18,688.50 — a bigger share than most people assume.
What is AGI?
Adjusted gross income: gross income less certain above-the-line deductions such as 401(k) and HSA contributions. It is $89,000 here and drives eligibility for many credits and deductions.
Should I itemise or take the standard deduction?
Take whichever is larger. The standard deduction of $14,600 for single filers is high enough that most taxpayers no longer itemise — typically only substantial mortgage interest, state taxes and charitable giving clear it.
What is the standard deduction for 2024?
$14,600 for single filers, $29,200 for married filing jointly and $21,900 for head of household. It is indexed to inflation and rises most years.
Are tax credits better than deductions?
Substantially. A credit reduces tax dollar for dollar; a deduction reduces taxable income, so it is worth only your marginal rate. A $1,000 credit saves $1,000; a $1,000 deduction saves $220 at 22%.
Why is my refund so large?
Because more was withheld than you owed. A refund is not a benefit — it is the return of an interest-free loan. Adjusting your W-4 converts it into monthly cash flow instead.
Does this include state tax?
No, federal only. State rates range from zero to over 13% and some states use entirely different definitions of taxable income. Use the State Tax Calculator alongside this one.
What is the Social Security wage base?
$168,600 for 2024. Earnings above it pay no further Social Security tax, though the 1.45% Medicare component continues uncapped — which is why very high earners see their FICA rate fall.
How do the brackets change for married filers?
They are exactly double the single bands through the 32% bracket, then narrower. That structure benefits single-earner couples substantially and only penalises very high equal earners.
Is this calculator accurate for filing?
It is a planning estimate using 2024 single-filer brackets. Real returns involve credits, phase-outs, alternative minimum tax and state rules that no general calculator captures. Use it to understand your position, not to file.
Is this income tax calculator free to use?
Yes. It is free, requires no account, and has no usage limits. ApexConverter is funded by contextual advertising, never by selling user data.
Is my data sent to a server?
No. The engine runs as Vanilla JavaScript inside your browser under our Zero-Server Client-Side Execution model. Your figures are computed locally and are never transmitted, logged, or stored.
How accurate is this calculator?
It applies the standard closed-form formula in IEEE-754 double precision, rounding only at the display layer. The engine is reconciled against an independent reference implementation before release.
Does it work on mobile?
Yes. The interface is mobile-first with numeric keypad hints and is tested down to a 320-pixel viewport with no horizontal scrolling.
Can I use it offline?
Largely, yes. Because computation is client-side, the page continues to calculate without a network connection once it has loaded.