Bonus Tax Withholding Methods: Flat vs Aggregate
Bonus pay can be withheld using different payroll approaches. This guide explains why your estimated net bonus changes by method.
Flat supplemental methodOpen details+
Many payroll systems use a flat federal supplemental withholding rate for bonus checks.
Aggregate methodOpen details+
Aggregate withholding combines bonus and regular wages, then applies bracket logic to the total.
Why net numbers differOpen details+
Different methods change withholding timing and can shift take-home amounts check-to-check.
Frequently asked questions
Is one bonus method always better?Open details+
Not always. It depends on payroll implementation and year-end reconciliation.
Does state tax on bonuses vary?Open details+
Yes. State rules vary and can materially change net bonus outcomes.
People also ask
Why was my bonus taxed so high?Open details+
Withholding methods can front-load tax withholding versus final annual liability.
Can bonus withholding be adjusted?Open details+
In some payroll systems, elections or extra withholding changes can affect outcomes.
People also use
Use these calculators to turn the guide into a more specific estimate for your pay, filing status, and state.