Supplemental tax rates

You can use the supplemental federal income tax rate when you create a bonus if two conditions are met:

• You pay the bonus separately from a regular paycheck (also called a bonus run)
• You withhold at regular withholding rates on the employee's regular salary

The federal supplemental income tax rate is currently a flat 25%. This rate may not be beneficial to your employees if it's higher than their regular rate. If you want to use the supplemental income tax rate for some employee bonuses and not for others, do separate bonus runs.

If your state also has a supplemental income tax rate, we use the state rate when you choose to use the supplemental rates.

If the employee has accumulated $1,000,000 or more in supplemental wages in the current tax year, you must withhold federal income tax at 39.6%. Check with your accountant regarding allowable tax treatment of a bonus.