About
A paycheck estimator you can check our work on
Most calculators hide their assumptions. We show which tax year and rules produced every number.
Our approach
Federal withholding follows IRS payroll methods and W-4 inputs. Social Security, Medicare and Additional Medicare are handled separately from employer taxes.
Verified data
Tax rules are versioned by tax year and effective date. Published versions are never edited in place — changes create a new version and an audit record.
Estimates, not advice
Results estimate withholding, not the tax you'll owe when you file. For advice, talk to a tax professional.
Where we are
We're in an early preview. Gross pay works today; withholding goes live as each rule set is verified.