US Bonus Tax Withholding Calculator
Calculate federal 22% supplemental bonus withholding versus true marginal tax liability under IRS Publication 15-T with refund gap analysis.
1How to Use US Bonus Tax Withholding Calculator
Employers withhold a flat 22% federal tax on supplemental wages under IRS Publication 15-T. However, your actual tax liability depends on your combined annual earnings.
- Step 1.Enter your regular base annual salary in USD ($).
- Step 2.Enter the gross bonus amount being paid.
- Step 3.Enter your applicable state income tax rate.
- Step 4.Review your net bonus check and check if you will owe taxes or get a refund.
2Formulas, Methodology & Key Features
IRS Supplemental Wage Withholding Formula
For bonuses under $1 million, employers withhold a statutory 22% federal rate, 7.65% FICA, and state taxes. True tax liability is based on regular progressive brackets:
3US Bonus Withholding vs True Tax Matrix ($)
| Base Salary | Bonus Amount | Withheld (22% Fed+FICA) | True Tax Liability | Year-End Tax Variance |
|---|---|---|---|---|
| $85,000 | $10,000 | $3,465 | $3,465 | $0 (Balanced) |
| $130,000 | $25,000 | $8,663 | $9,163 | +$500 (Owed) |
| $200,000 | $50,000 | $17,325 | $22,325 | +$5,000 (Owed) |
| $250,000 | $100,000 | $34,650 | $47,650 | +$13,000 (Owed) |
?Frequently Asked Questions (FAQ)
Common questions answered about US Bonus Tax Withholding Calculator.
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