Federal tax math,
done line by line
Free federal tax calculators: income tax by bracket, gross-up salary, bonus and severance withholding, rental income tax, late filing penalties, and sales tax. All in your browser.
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Real IRS mechanics, not guesswork
The federal income tax calculator uses the actual 2024 marginal brackets and standard deductions, not a flat estimate. The bonus and severance tools apply the same IRS supplemental-wage withholding rules your payroll department uses. And the late penalty calculator models the actual failure-to-file/failure-to-pay interaction, not a simplified guess.
Every tool assumes nothing about your state
Federal tax rules are the same nationwide, but state income tax and sales tax vary enormously — so tools that touch either one let you enter your own local rate instead of assuming a number that's wrong for most readers.