Calculate tax without looking up the formula.
Choose a calculator, enter the amount you know, and see the tax, total, and formula immediately. Country and state presets fill common rates for you.
Each bracket applies only to the income inside it.
Common calculations
Add or remove tax from a price, or estimate how much remains after tax.
Sales Tax Calculator by State — Add or Remove Tax
Choose a state, then add sales tax to a price or remove included tax from a total with a 2026 average combined planning rate filled automatically.
VAT Calculator — Add or Remove VAT
Add VAT to a net amount or extract included VAT from a gross amount using a country preset or custom rate.
Lottery Tax Calculator — Federal Withholding & Take-Home
Compare the common 24% federal lottery withholding with an estimated final federal tax and a state rate you enter.
Choose a calculation
Enter what you know. Each tool shows the numbers it uses and what the estimate leaves out.
Income
2025–2026 Federal Income Tax & Refund Calculator
Estimate federal income tax, then compare it with withholding and payments to see a projected refund or amount owed.
2026 Paycheck Tax Calculator
Turn annual salary into per-paycheck federal income tax, Social Security, Medicare and estimated take-home pay.
California State Income Tax Calculator — 2025 Rates
Estimate 2025 California taxable income and state income tax using current FTB rate schedules and standard deductions.
Freelance
2026 Self-Employment Tax Calculator — 92.35% Base
Enter payments received and business expenses; TaxMathKit calculates net profit, the 92.35% base, Social Security and Medicare automatically.
2026 1099 Tax Calculator — Per-Payment Reserve & Quarterly Tax
Plan a 1099 tax reserve from business profit, W-2 withholding and a typical payment—then compare the annual and quarterly federal estimate.
2026 Quarterly Tax Calculator
Enter expected wages, freelance payments and expenses; TaxMathKit estimates total tax and chooses an available federal safe-harbor method.
Sales
Sales Tax Calculator by State — Add or Remove Tax
Choose a state, then add sales tax to a price or remove included tax from a total with a 2026 average combined planning rate filled automatically.
Reverse Tax Calculator
Choose a state and work backward from a tax-inclusive total; TaxMathKit fills a 2026 average combined planning rate automatically.
Car Out-the-Door Price & Sales Tax Calculator
Estimate the amount due after trade-in—not just sales tax—with state vehicle rates, title and registration, plates, dealer paperwork, rebates and add-ons shown line by line.
VAT Calculator — Add or Remove VAT
Add VAT to a net amount or extract included VAT from a gross amount using a country preset or custom rate.
Start with the question you need answered
Each short answer explains the situation and opens the relevant calculator with an example.
How much should I set aside for 1099 taxes?
Read and calculate →Quarterly estimated paymentsHow much should a freelancer pay in quarterly taxes?
Read and calculate →W-2 plus side incomeHow do I calculate 1099 taxes if I also have a W-2 job?
Read and calculate →Freelance income estimateHow much tax will I owe on $50,000 of freelance income?
Read and calculate →Paycheck and take-home payHow much will my paycheck be after taxes?
Read and calculate →Sales tax by locationHow do I calculate sales tax by state?
Read and calculate →See the rate, formula, and exclusions beside the answer.
Every calculator identifies the tax year, shows the calculation, and lists important items it does not include. Official rate and rule sources are linked for checking.
See how the calculators are updated- 01Start with the right tax base
Gross income, taxable income and business profit are not interchangeable.
- 02Apply published thresholds
Brackets, deductions and wage bases are versioned by tax year.
- 03Show the boundaries
Credits, phaseouts and local rules are called out instead of hidden.
Need to include freight or landed cost?
Use ShipMathLab for dimensional weight, freight, pallet loading, landed cost, and ecommerce margin calculations.