How this calculator works
This models withholding, not final tax liability. The federal 22% input is editable because supplemental-wage treatment varies.
Worked example
A $5,000 bonus at 22% federal, 5% state, and 7.65% employee FICA has about $1,732.50 withheld.
Assumptions and limits
Inputs are treated as non-negative U.S. dollar amounts. Results are rounded to cents where useful. This tool is for planning and does not determine legal eligibility, payroll compliance, or final tax liability.
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