Short Answer
Bonuses are considered supplemental wages and are subject to federal income tax withholding. Employers can withhold taxes using a flat percentage rate or combine the bonus with regular wages for withholding based on your W-4.
State and local taxes, Social Security, and Medicare are also applied. Understanding how bonuses are taxed helps employees plan for take-home pay and avoid surprises when receiving extra income.
Detailed Explanation:
Taxation and withholding of bonuses
Federal income tax
Bonuses are treated as supplemental wages by the Internal Revenue Service. Employers can withhold federal income tax in two ways. One method is using a flat rate of 22% for bonuses under $1 million. Another method combines the bonus with regular wages and calculates withholding using the standard W-4 information and payroll tables.
Social Security and Medicare
In addition to federal income tax, bonuses are subject to Social Security tax (6.2% up to the annual wage limit) and Medicare tax (1.45%, with an additional 0.9% for high earners). These withholdings are calculated like regular wages.
State and local taxes
State and local income taxes may also apply to bonuses, depending on where you live. Each state has its own rules for withholding on supplemental wages. Employers deduct these taxes along with federal taxes.
Methods employers use to withhold
Flat rate method
The IRS allows a flat withholding rate of 22% for federal income tax on most bonuses. This method is simple and commonly used for one-time or irregular payments.
Aggregate method
Employers can add the bonus to the regular paycheck, calculate total wages for the pay period, and withhold taxes based on W-4 information and payroll tables. This may result in slightly higher or lower withholding depending on total income and allowances.
Considerations for large bonuses
Bonuses over $1 million are taxed at a higher flat rate of 37% for federal withholding. This ensures sufficient withholding for high-income supplemental payments.
Planning for bonuses
Understanding take-home pay
Because bonuses are taxed similarly to wages, take-home pay can be significantly lower than the gross bonus amount. Employees should be aware that taxes, Social Security, Medicare, and state taxes will reduce net income.
W-4 and withholding adjustments
Employees can adjust their W-4 to modify withholding if they anticipate receiving large bonuses, helping avoid underpayment penalties or over-withholding.
Tax reporting
Bonuses are reported on Form W-2 along with regular wages. Accurate withholding ensures that tax liability is covered and simplifies annual tax filing.
Practical examples
- A $5,000 bonus may have $1,100 withheld for federal income tax (22%), plus Social Security and Medicare contributions, reducing take-home pay.
- If a bonus is combined with regular wages in the aggregate method, withholding may vary depending on the total pay and claimed W-4 allowances.
- For a $1.5 million bonus, federal withholding would be 37%, plus other standard deductions for Social Security, Medicare, and state taxes.
Conclusion
Bonuses are treated as supplemental wages and are subject to federal, state, Social Security, and Medicare taxes. Employers can withhold using a flat rate or aggregate method based on W-4 information. Understanding how bonuses are taxed helps employees plan take-home pay, adjust withholding if needed, and ensures proper tax compliance.