Taxes Calculators
Taxes are the largest single line item in most household budgets, but the rules are complex, the forms change every year, and the software usually wants yo...
9 calculators available · Updated 2026-06-15
Taxes are the largest single line item in most household budgets, but the rules are complex, the forms change every year, and the software usually wants your data. Our tax calculators give you quick, accurate estimates for federal income tax, FICA, state income tax, capital gains, self-employment tax, and the special regimes in Spain, Mexico, Argentina, Colombia, the UK, Germany, and Italy. Every formula here follows the current year's brackets and thresholds from the IRS, HMRC, AEAT, SAT, and equivalent agencies, and runs in your browser so your income, deductions, and personal data never leave your device.
How to choose the right tax calculator
Start with your filing status and country. For U.S. federal income tax, the salary calculator breaks out federal, FICA, state, and Medicare withholdings. The tax refund calculator estimates your expected refund based on withholdings versus actual liability. The capital gains calculator separates short-term (ordinary income rates) from long-term (0%, 15%, or 20% depending on income). The self-employment tax calculator adds the 15.3% SE tax to your income tax for 1099 workers. For non-U.S. users, we have country-specific calculators: IRPF for Spain, ISR for Mexico, monotributo for Argentina, retención en la fuente for Colombia, PAYE and self-assessment for the UK, Lohnsteuer for Germany, and regime forfettario for Italy. Each calculator uses current-year brackets, standard deductions, and country-specific credits.
U.S. federal income tax fundamentals
The U.S. uses a progressive marginal tax system with seven brackets (10%, 12%, 22%, 24%, 32%, 35%, 37%) for 2026. The salary calculator applies the standard deduction ($14,600 single, $29,200 married filing jointly) and your marginal bracket to compute federal tax. FICA (Social Security at 6.2% up to $168,600 in 2026, Medicare at 1.45% with no cap, plus 0.9% Additional Medicare above $200K) is split between employee and employer. The marginal vs. effective tax rate distinction matters: someone in the 24% bracket with deductions may have an effective rate of 15%. The capital gains calculator handles short-term gains (taxed as ordinary income) and long-term gains (0%, 15%, or 20% depending on income), plus the 3.8% Net Investment Income Tax above $200K MAGI.
Self-employment, quarterly taxes, and 1099 work
Self-employed individuals pay both halves of FICA (15.3% on net earnings) plus regular income tax. The self-employment tax calculator adds this to your federal liability and reminds you of quarterly estimated payment deadlines (April 15, June 15, September 15, January 15). You can deduct half of SE tax as an adjustment to income, which the calculator factors in. The home office deduction, health insurance premiums, and retirement contributions (SEP-IRA, Solo 401k) all reduce your SE tax base. The 1099 vs. W-2 calculator compares the take-home pay of a $100K salary versus $100K contract: the contractor has higher gross but pays 15.3% SE tax and the full FICA, with no employer matching. The QBI (Qualified Business Income) deduction calculator helps pass-through business owners claim the 20% Section 199A deduction.
International: Spain, Mexico, UK, Germany, and more
The IRPF calculator (Spain) applies the 2026 general state tranches (19% to 47%) plus the autonomous community tranche (varies by region, total rates from 24% to 50%). The ISR calculator (Mexico) uses the new Resolución Miscelánea Fiscal rates: 1.92% to 35% for individuals, plus the UMA-based subsidy. The monotributo calculator (Argentina) helps small taxpayers choose the right category based on gross income, surface area, energy consumed, and rent paid. The UK PAYE calculator handles the 2026/27 personal allowance (£12,570), basic rate (20%), higher rate (40%), and additional rate (45%), plus National Insurance. The German Lohnsteuer calculator uses the official 2026 formula from the Bundesfinanzministerium. The Italian regime forfettario calculator applies the 5% or 15% flat tax with the €85,000 revenue cap.
Methodology, accuracy, and limitations
All tax calculators use the current year's parameters as published by the relevant tax authority, with last-updated dates shown on each page. Formulas are reviewed quarterly when agencies publish updates. We do not account for every edge case: AMT, NIIT, foreign tax credits, treaty positions, and state-specific nuances may require professional review. Tax calculators are for estimation and planning, not filing. For filing, use IRS Free File, HMRC online services, AEAT Renta Web, or a CPA/EA/tax professional in your country. Every calculation runs in your browser; no income data, SSN, or filing details are sent to any server.
Most Popular Taxes Calculators
Salary
Convert hourly to annual income.
Capital Gains
Profit on a sale after taxes.
Self Employment Tax Calculator — CalcxApp
Calculate your self-employment tax (Social Security + Medicare), income tax, deductible half of SE tax, and total tax burden as a freelancer or independent contractor.
Tax Code UK Calculator 2026 — Personal Allowance & Take-Home
Decode your UK tax code. Calculate personal allowance, taxable income & take-home pay for 2026.
IR35 Calculator UK — Inside vs Outside
Compare your annual take-home pay under Inside IR35 and Outside IR35 in seconds.
All Taxes Calculators (9)
Capital Gains
Profit on a sale after taxes.
Net Pay
Take-home pay after taxes.
Salary
Convert hourly to annual income.
Raise
New salary after a raise.
Overtime
Total pay including overtime.
Weekly Pay
Annual salary across pay frequencies.
IR35 Calculator UK — Inside vs Outside
UKCompare your annual take-home pay under Inside IR35 and Outside IR35 in seconds.
Self Employment Tax Calculator — CalcxApp
Calculate your self-employment tax (Social Security + Medicare), income tax, deductible half of SE tax, and total tax burden as a freelancer or independent contractor.
Tax Code UK Calculator 2026 — Personal Allowance & Take-Home
UKDecode your UK tax code. Calculate personal allowance, taxable income & take-home pay for 2026.
Frequently Asked Questions
How accurate are online tax calculators? ▾
For simple W-2 filers with standard deductions, our salary and tax refund calculators are accurate within $50-$100 of actual liability. For complex situations (AMT, investment income, multi-state, self-employment), the calculator gives a good estimate but you should verify with tax software or a professional before filing.
What is the difference between marginal and effective tax rate? ▾
The marginal rate is the rate on your last dollar of income (e.g., 24% bracket). The effective rate is your total tax divided by total income. Someone earning $100,000 single in 2026 with a $14,600 standard deduction has a marginal rate of 22% but an effective rate around 13%. The salary calculator shows both.
How do quarterly estimated taxes work? ▾
If you expect to owe more than $1,000 in taxes beyond withholdings, the IRS requires quarterly payments (April 15, June 15, September 15, January 15). The self-employment tax calculator estimates your quarterly payment and includes safe harbor rules (pay 100% of last year's tax or 90% of current year's to avoid penalties).
Do I need to file taxes in two countries? ▾
If you are a U.S. citizen or resident, you must file a U.S. return on worldwide income regardless of where you live. Most countries have tax treaties with the U.S. to prevent double taxation through the Foreign Tax Credit, which the international calculators can help estimate. The UK, Germany, and Spain calculators handle residency-based taxation.
Can I trust a free tax calculator with my data? ▾
Yes, because every formula on this site runs client-side. Your income, deductions, and SSN (if you enter one) never leave your browser. We do not set cookies on calculator pages, do not require an account, and do not sell or share any data. The trade-off is that you cannot save returns between sessions unless you export to CSV.
Sources & References
The formulas, definitions, and best-practice guidance in these taxes calculators are grounded in the following authoritative sources: