Comprehensive Guide
Learn more in our Business & Tax Guide.
How it works
paycheck deduction calculator takes your inputs and produces federal tax, state tax, fica, take-home pay. Calculate all paycheck deductions: federal tax, state tax, FICA, insurance, and 401K. You provide 5 inputs: Gross Pay per Period (currency, in dollars) (default: 3500 dollars); Filing Status — choose from Single, Married Joint (default: "single"); State — choose from California (9.3%), Texas (0%), New York (6.85%), Florida (0%) (default: "tx"); 401K Contribution % (percent, in percent) (default: 10 percent); Health Insurance Premium (currency, in dollars) (default: 200 dollars). The calculator returns 4 outputs: Federal Tax (the primary result); State Tax (a secondary output); FICA (a secondary output); Take-Home Pay (a secondary output). Business tax and finance calculations combine multiple moving parts — revenue, expenses, depreciation, tax brackets, and timing — in ways that make back-of-envelope estimates unreliable. This calculator handles the interaction of those variables precisely, so your business decisions rest on real arithmetic. With the default values, federal tax is computed from the interaction of every input field — change any one of them and the result updates immediately, so you can stress-test different scenarios without re-entering the whole form. Adjust the inputs to match your real financial situation. The defaults are realistic starting points, but every person's circumstances differ — your actual income, expenses, rates, and timelines will produce a different answer. Use the tool iteratively: start with the defaults, then change one variable at a time to see which factor has the largest impact on your outcome.Tips
- Start with the default values to see a baseline result, then change one input at a time to understand which factor matters most for your outcome.
- Replace every default with your actual number — estimates and rules of thumb produce estimates, not answers. Pull your real figures from pay stubs, statements, or account dashboards.
- Run the numbers quarterly, not annually. Tax brackets, revenue, and expenses shift throughout the year, and adjusting early is far cheaper than correcting at year-end.
Frequently asked questions
What deductions come out of my paycheck?
Federal tax, state tax, FICA (Social Security 6.2% + Medicare 1.45%), health insurance, 401K, dental, vision. Take-home is typically 65-75% of gross.
How accurate are the calculator results?
The math is exact — the same formulas a financial professional would use by hand. The precision of the output depends entirely on how realistic your inputs are. Use your actual numbers rather than estimates when possible. The defaults are reasonable starting points, but your real income, rates, and timeline will produce a different result.
What should I enter for gross pay per period?
Enter your actual gross pay per period value. The default of 3500 dollars is a common starting point, but replace it with your real figure for an accurate result.