Income Tax Calculator
Estimate your 2026 income tax liability. Enter income, filing status, and deductions to calculate federal tax owed, effective tax rate, and marginal tax
Calculator
Adjust values & calculateFederal Tax Bracket Breakdown
Formula
Federal income tax uses progressive brackets where each portion of income is taxed at increasing rates. The standard deduction reduces taxable income before brackets are applied. FICA taxes (Social Security at 6.2% up to $168,600 and Medicare at 1.45% on all earnings) are calculated on gross income. State taxes vary by state and are applied to state-defined taxable income.
Last reviewed: January 2026
Worked Examples
Example 1: Single Filer — $75,000 Income in California
Example 2: Married Filing Jointly — $120,000 in Texas
Background & Theory
The Income Tax Calculator — Federal & State Tax Estimator applies the following established principles and formulas. Finance and investing rest on the foundational concept of the time value of money: a dollar received today is worth more than a dollar received in the future, because present funds can be deployed to earn a return. This principle underlies virtually every valuation technique in modern finance. The future value of a present sum P growing at rate r over n periods is expressed as FV = P(1 + r)^n, while the present value of a future cash flow FV is PV = FV / (1 + r)^n. Compound growth amplifies returns significantly over long horizons, a dynamic often described as the eighth wonder of the world. Net Present Value (NPV) extends these mechanics to evaluate investment projects by summing the present values of all expected cash flows minus the initial outlay: NPV = sum[CF_t / (1 + r)^t] - C_0. A positive NPV indicates the project creates value above the required return. The Internal Rate of Return (IRR) is the discount rate that sets NPV to zero, providing a single percentage benchmark for project comparison. The risk-return tradeoff is the central tension of investment theory. Higher expected returns generally require accepting greater uncertainty. Harry Markowitz formalized this in Modern Portfolio Theory by demonstrating that portfolio variance can be reduced through diversification when assets are imperfectly correlated. The efficient frontier represents the set of portfolios offering the maximum return for a given level of risk. The Capital Asset Pricing Model (CAPM) extends this by introducing the market portfolio as a reference, defining expected return as E(r) = r_f + beta * (E(r_m) - r_f), where beta measures an asset's sensitivity to systematic market risk. Asset classes — equities, fixed income, real assets, and alternatives — differ in their return profiles, liquidity, and correlations. Strategic asset allocation determines long-run target weights based on investor objectives and risk tolerance, while tactical allocation permits short-run deviations to exploit perceived mispricings. Discount rates used in valuation models must reflect the cost of capital appropriate to the risk of the cash flows being discounted, a point stressed in corporate finance texts from Brealey, Myers, and Allen through to Damodaran.
History
The history behind the Income Tax Calculator — Federal & State Tax Estimator traces back through the following developments. The formal practice of lending at interest dates to ancient Mesopotamia, where the Code of Hammurabi around 1750 BCE regulated interest rates on grain and silver loans. Banking as an institutional activity took root in medieval Italy, with merchant bankers in Florence and Venice financing trade across Europe through instruments such as bills of exchange. The Medici family operated one of the most sophisticated banking networks of the fifteenth century, pioneering double-entry bookkeeping and correspondent banking relationships. Organized equity markets emerged in the early seventeenth century. The Dutch East India Company (VOC), chartered in 1602, issued shares to the public and created the Amsterdam Stock Exchange — widely regarded as the world's first formal stock exchange. The VOC allowed investors to buy and sell shares freely, establishing the template for the joint-stock company. The period also produced the Dutch tulip mania of 1636 to 1637, one of history's first recorded speculative bubbles, in which tulip bulb futures contracts reached extraordinary prices before collapsing. England's financial revolution followed in the late seventeenth century with the founding of the Bank of England in 1694 and the development of government bond markets. The South Sea Bubble of 1720 illustrated the dangers of speculative excess and contributed to early securities regulation. Throughout the eighteenth and nineteenth centuries, industrialization created enormous demand for capital, fueling the expansion of stock exchanges in London, Paris, New York, and beyond. The New York Stock Exchange, formalized in 1817, became the world's dominant equities market by the twentieth century. The Great Crash of 1929 and subsequent Great Depression prompted the US Securities Act of 1933 and Securities Exchange Act of 1934, establishing the SEC and mandatory disclosure requirements. Harry Markowitz published his landmark portfolio selection paper in 1952, launching quantitative finance. The CAPM emerged in the 1960s through work by Sharpe, Lintner, and Mossin. John Bogle launched the first retail index fund in 1976, democratizing diversified investing and challenging active management orthodoxy.
Frequently Asked Questions
Reviewed by Sahil, Senior Finance & Tax Editor · Editorial policy
Income Tax Calculator Formula
Total Tax = Federal Tax + State Tax + Social Security (6.2%) + Medicare (1.45%)
Federal income tax uses progressive brackets where each portion of income is taxed at increasing rates. The standard deduction reduces taxable income before brackets are applied. FICA taxes (Social Security at 6.2% up to $168,600 and Medicare at 1.45% on all earnings) are calculated on gross income. State taxes vary by state and are applied to state-defined taxable income.
Income Tax Calculator — Worked Examples
Example 1: Single Filer — $75,000 Income in California
Problem: Calculate total tax and take-home pay for a single filer earning $75,000 in California, taking the standard deduction.
Solution: Standard Deduction = $14,600\nTaxable Income = $75,000 - $14,600 = $60,400\n\nFederal Tax:\n10% on $11,600 = $1,160\n12% on $35,550 = $4,266\n22% on $13,250 = $2,915\nTotal Federal = $8,341\n\nFICA:\nSocial Security = $75,000 × 6.2% = $4,650\nMedicare = $75,000 × 1.45% = $1,087.50\nTotal FICA = $5,737.50\n\nCA State Tax ≈ $60,400 × 7.25% = $4,379
Result: Federal: $8,341 | FICA: $5,738 | State: $4,379 | Total Tax: $18,458 | Take-Home: $56,542
Example 2: Married Filing Jointly — $120,000 in Texas
Problem: Calculate taxes for a married couple earning $120,000 in Texas (no state income tax), standard deduction.
Solution: Standard Deduction = $29,200\nTaxable Income = $120,000 - $29,200 = $90,800\n\nFederal Tax:\n10% on $23,200 = $2,320\n12% on $67,600 = $8,112\nTotal Federal = $10,432\n\nFICA:\nSocial Security = $120,000 × 6.2% = $7,440\nMedicare = $120,000 × 1.45% = $1,740\nTotal FICA = $9,180\n\nState Tax = $0 (Texas)
Result: Federal: $10,432 | FICA: $9,180 | State: $0 | Total Tax: $19,612 | Take-Home: $100,388
Income Tax Calculator — Frequently Asked Questions
What is the difference between marginal and effective tax rate?
Your marginal tax rate is the rate applied to your last dollar of taxable income — it's the highest bracket you fall into. Your effective tax rate is the average rate you actually pay across all your income, calculated as total tax divided by gross income. For example, a single filer earning $75,000 in 2024 has a marginal rate of 22%, but their effective federal rate is approximately 12.5%. This is because the first $11,600 is taxed at 10%, income from $11,601-$47,150 at 12%, and only the portion above $47,150 at 22%. Many people mistakenly believe that moving into a higher bracket means ALL their income is taxed at that rate — this is false. Only the income within each bracket is taxed at that bracket's rate.
How is FICA (Social Security and Medicare) tax calculated?
FICA taxes consist of two parts: Social Security tax at 6.2% on earnings up to $168,600 (2024 wage base), and Medicare tax at 1.45% on all earnings with an additional 0.9% surtax on earnings above $200,000 for single filers ($250,000 for married). Your employer pays a matching amount, so the total FICA rate is 15.3%. Self-employed individuals pay both halves (15.3%) through self-employment tax but can deduct the employer portion. For someone earning $75,000: Social Security = $75,000 × 6.2% = $4,650, Medicare = $75,000 × 1.45% = $1,087.50, total FICA = $5,737.50. FICA taxes are not affected by deductions or filing status — they're calculated on gross wages from the first dollar earned.
Which states have no income tax?
Nine states have no state income tax: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. New Hampshire previously taxed interest and dividend income but phased this out starting 2025. Living in a no-income-tax state can save thousands per year — someone earning $75,000 would save approximately $3,750 compared to living in California (7.25% effective rate). However, states without income tax often compensate with higher property taxes, sales taxes, or other fees. Texas, for example, has property tax rates averaging 1.8% compared to the national average of about 1.1%. When comparing states, look at total tax burden (income + property + sales + excise taxes) rather than just income tax to get the full picture.
How can I reduce my taxable income legally?
Several legal strategies reduce your taxable income: Maximize retirement contributions — 401(k) allows up to $23,000/year ($30,500 if 50+), Traditional IRA up to $7,000 ($8,000 if 50+). Contribute to an HSA if eligible — $4,150 individual or $8,300 family (2024), which provides a triple tax advantage. Use FSA for dependent care (up to $5,000) or healthcare expenses. Claim all eligible deductions: student loan interest (up to $2,500), educator expenses ($300), moving expenses for military. Take advantage of tax credits which reduce tax dollar-for-dollar: Child Tax Credit ($2,000/child), Earned Income Tax Credit, American Opportunity Credit for education. Consider tax-loss harvesting in investment accounts. If self-employed, deduct business expenses, home office, and self-employment tax. Charitable donations of appreciated stock avoid capital gains while providing a deduction.
What inputs do I need to use Income Tax Calculator accurately?
Each field is labelled with the required unit (metric or imperial). Gather your source values before starting — for example, a weight measurement in kilograms, a distance in metres, or a dollar amount — and enter them exactly as measured. The formula section on this page lists every variable and explains what each represents.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.