Bonus pay can be withheld using different payroll approaches. PayStubIQ compares the common 22% supplemental rate with a planning estimate based on how the bonus changes projected annual federal tax.
Maintained by the PayStubIQ Editorial Team · Updated July 14, 2026
See our editorial and calculation-review standards. No CPA or attorney review is claimed.
Many payroll systems use a flat federal supplemental withholding rate for bonus checks. That method can be simple to estimate, but the amount withheld from the check is still only withholding and is reconciled against actual tax liability when filing.
The calculator's alternative method estimates the extra annual federal tax created when the bonus is added to year-to-date wages. It is useful for planning, but it is not a reproduction of an employer's aggregate payroll calculation, which depends on regular wages in the payroll period, Form W-4 data, and the employer's payroll method.
Different methods change withholding timing and can shift take-home amounts check-to-check even when the same annual bonus is paid. State rules, FICA wage-base exposure, local tax, and pre-tax deductions can also change the net bonus result.
Worked example
Scenario: An employee receives a separate $10,000 bonus check. Payroll uses the federal supplemental method and also withholds Social Security, Medicare, and state tax.
Analysis: Federal supplemental withholding alone does not explain the net check. The employee must add FICA, state withholding, any local tax, and deductions applied to supplemental wages. If year-to-date wages are near the Social Security wage base, the Social Security line may differ from a simple 6.2% calculation.
Practical outcome: Reconcile every line on the bonus check, then use a full-year tax estimate to judge whether total withholding is on track. A large amount withheld from one check does not by itself mean the bonus is taxed at that final rate.
Not always. It depends on payroll implementation and year-end reconciliation.
Yes. State rules vary and can materially change net bonus outcomes.
These primary government sources support the rules or workflow discussed above. The note beside each link explains why it is relevant.
Withholding methods can front-load tax withholding versus final annual liability.
In some payroll systems, elections or extra withholding changes can affect outcomes.
Use these calculators to turn the guide into a more specific estimate for your pay, filing status, and state.