Formulas and 2026 figures checked & updated: July 2026
How to Use the Federal Income Tax Calculator
- Enter your annual gross income — salary, wages, or self-employment earnings before any deductions.
- Select your filing status: single, married filing jointly, married filing separately, or head of household.
- Enter any pre-tax deductions, such as 401(k), HSA, or FSA contributions — these reduce your taxable income before tax is calculated.
- Enter itemized deductions only if they exceed your standard deduction; otherwise leave this at zero so the calculator applies the standard deduction automatically.
- Add any additional income (freelance work, side gigs, investments) and a state income tax rate if your state taxes wages.
- Review your results: federal tax owed, effective and marginal tax rates, FICA taxes, and take-home pay. Example: a single filer earning $85,000 with $6,500 in pre-tax contributions owes about $8,440 in federal income tax plus roughly $6,503 in FICA, leaving about $63,558 a year ($5,296 a month) after the contribution and estimated federal taxes.
What This Calculator Does
The Federal Income Tax Calculator estimates your 2026 federal income tax bill, take-home pay, and effective vs. marginal tax rates. It applies the 2026 progressive tax brackets to your taxable income (after subtracting pre-tax retirement contributions and the standard or itemized deduction), then adds FICA payroll taxes — Social Security and Medicare — to show your total tax burden.
The result is driven mainly by four inputs: your gross income, filing status, pre-tax deductions, and whether you itemize or take the standard deduction. For 2026, the standard deduction is $16,100 for single filers and $32,200 for married filing jointly. Because the US income tax system is progressive, only the income within each bracket is taxed at that bracket's rate.
People use this calculator to answer practical questions before they happen: how much of a raise or bonus actually reaches their bank account, whether increasing a 401(k) contribution meaningfully lowers a tax bill, how freelance or side income changes their bracket, or how take-home pay compares between job offers in different states. It's also useful for mid-year tax planning — checking your projected effective rate partway through the year helps you decide whether to adjust withholding or increase pre-tax contributions before December 31.
Formula
Tax = Σ [bracket portion of taxable income × bracket rate], plus FICA = (wages × 6.2%, capped) + (wages × 1.45%)Taxable income is calculated as gross income minus pre-tax deductions (401k, HSA) minus the standard or itemized deduction (whichever is higher). Federal tax is then computed by applying each bracket's rate only to the income that falls within that bracket. FICA taxes are calculated separately on gross wages: Social Security at 6.2% up to the annual wage base ($184,500 for 2026), and Medicare at 1.45% on all wages (plus an additional 0.9% above $200,000 single / $250,000 married).
- AGIAdjusted gross income — gross income minus pre-tax deductions
- Taxable IncomeAGI minus the standard (or itemized) deduction
- Marginal RateThe tax rate applied to your last dollar of taxable income
- Effective RateTotal tax ÷ gross income — your true average tax rate
Examples
Example 1: Single filer, $85,000 salary, $6,500 to 401(k)
AGI = $78,500. Standard deduction (single, 2026) = $16,100. Taxable income ≈ $62,400.
Federal income tax ≈ $8,440, with a 22% marginal bracket. FICA ≈ $6,503 on gross wages. After the $6,500 pre-tax contribution, estimated take-home is about $63,558/year, or $5,296/month.
Example 2: Married filing jointly, $150,000 combined income
No pre-tax deductions. Standard deduction (MFJ, 2026) = $32,200. Taxable income ≈ $117,800.
Federal income tax ≈ $15,340, with a 22% marginal bracket. FICA ≈ $11,475. Estimated take-home is about $123,185/year, or $10,265/month.
Example 3: High earner hitting the Social Security wage base
Single filer, $250,000 salary, $0 pre-tax deductions, standard deduction $16,100. Taxable income ≈ $233,900.
Federal income tax ≈ $51,304, with a 32% marginal bracket. Social Security tax caps at $184,500 × 6.2% = $11,439. Medicare including Additional Medicare Tax is about $4,075. Estimated take-home is about $183,182/year.
Key Terms Explained
- Marginal Tax Rate
- The tax rate applied to your last dollar of income — your top tax bracket. It's higher than your effective (average) rate.
- Effective Tax Rate
- Your total tax divided by your total income — the average rate you actually pay across all brackets.
- Standard Deduction
- A fixed amount you can subtract from income before tax instead of itemizing. Most filers take the standard deduction.
- FICA Taxes
- Payroll taxes for Social Security (6.2%) and Medicare (1.45%) withheld from wages, separate from federal income tax.
- Traditional IRA
- A retirement account funded with pre-tax (or deductible) dollars. Contributions may lower your taxable income today, but withdrawals in retirement are taxed as ordinary income.
- Employer Match
- Money your employer adds to your 401(k) based on your own contributions — effectively free retirement savings, up to a limit.
Methodology
This calculator applies the 2026 IRS progressive tax brackets to your taxable income, then layers on FICA payroll taxes — 6.2% Social Security up to the annual wage base and 1.45% Medicare on all wages, plus a 0.9% surtax above the high-earner threshold — to estimate your total federal tax burden and take-home pay. Figures follow IRS Revenue Procedure guidance and are for planning purposes only; consult a tax professional or the IRS for your exact liability.
Frequently Asked Questions
What are the 2026 federal income tax brackets?+
For 2026, the seven rates remain 10%, 12%, 22%, 24%, 32%, 35%, and 37%. Single filers enter the 22% bracket above $50,400. Source: IRS Revenue Procedure 2025-32.
What is the 2026 standard deduction?+
Single: $16,100 · Married Jointly: $32,200 · Head of Household: $24,150 · Married Separately: $16,100.
What is FICA tax?+
Social Security: 6.2% on wages up to $184,500. Medicare: 1.45% on all wages, plus 0.9% above the applicable threshold.
How do I calculate my take-home pay from my salary?+
Take-home pay equals your gross salary minus pre-tax deductions, federal income tax, and FICA taxes (Social Security and Medicare), plus any state tax if applicable. This calculator automates that math using the current year's tax brackets and deduction amounts, showing both your annual and monthly take-home pay.
What's the difference between AGI, taxable income, and gross income?+
Gross income is your total earnings before any deductions. Adjusted gross income (AGI) is gross income minus above-the-line deductions like pre-tax 401(k) or HSA contributions. Taxable income is AGI minus the standard deduction (or itemized deductions, whichever is greater) — it's the figure your federal tax bracket rates are actually applied to.
Do I owe additional Medicare tax if I earn over $200,000?+
Yes. In addition to the standard 1.45% Medicare tax on all wages, an Additional Medicare Tax of 0.9% applies to wages above $200,000 for single filers ($250,000 for married filing jointly). Unlike Social Security, Medicare tax has no wage cap, so it applies to every dollar you earn, including amounts above the surtax threshold.
Can I save my results?+
Yes. Use “Save results” to store a snapshot. Without an account it remains in this browser. If you log in, saved scenarios sync securely to your SmartRates account so they are available on your other devices.
How do I share my calculation?+
Click “Share” in the toolbar to copy a link (or open your device’s share sheet). The link encodes your exact inputs, so whoever opens it sees the calculator pre-filled with the same numbers and the same result.
Can I email my calculator results?+
Yes. Click “Email results” to open your default email application with the current inputs, results, and calculator link already included. Review the message and choose the recipient before sending.
Can I export or print my results as a PDF?+
Yes. Click “Export PDF” to open a clean, printable summary of your inputs and results that you can save as a PDF or print. It includes a timestamp and a link back to the calculator.
How accurate are the calculator results?+
The arithmetic follows the formula and assumptions documented on this page. The result is still an estimate because actual rates, fees, taxes, timing conventions, eligibility rules, and provider calculations can differ. Use figures from your official quote, statement, contract, or tax form before making a financial decision.
Which inputs have the biggest effect on the result?+
Rate, time, starting balance, recurring payments or contributions, and fees usually have the largest effects. Change one input at a time to create a conservative, expected, and optimistic scenario instead of relying on a single forecast.
Are taxes, fees, and inflation included?+
Only when they appear as an input or are explicitly described in the methodology. Do not assume an omitted cost is zero. Review the formula and methodology sections to see exactly what is included before comparing the result with an outside quote.
Can this calculator predict future rates or returns?+
No. A calculator projects the assumptions entered; it cannot predict market returns, inflation, variable interest rates, tax-law changes, or provider decisions. Rerun the calculation with several assumptions to understand the range of possible outcomes.
Why might my lender, bank, broker, or tax software show a different result?+
Professional systems may use daily timing, transaction dates, compounding conventions, rounding rules, account-specific fees, credits, eligibility details, or regulations that a general-purpose calculator cannot know. A small difference can be rounding; a large difference usually means an assumption or included cost is different.
Disclaimer: Calculations are for informational purposes only and do not constitute professional financial advice. Please consult with a certified professional before making financial decisions.