California taxes bonuses the same way it taxes regular wages

Your bonus in California is subject to both federal and state income tax, Social Security tax, and Medicare tax—the same taxes that come out of your regular paycheck. California does not have a separate bonus tax rate. Instead, your employer withholds taxes from your bonus based on your total income for the year, your filing status, and the number of dependents you claim on your W-4 form.

The amount withheld depends on how your employer processes the bonus. If your employer adds the bonus to your regular paycheck in the same pay period, it gets taxed as part of that paycheck using your normal withholding rate. If your employer issues the bonus separately, your employer may use one of two methods: the percentage method (withholding a flat percentage, often 22% for federal and 9.3% for California state) or the aggregate method (combining it with your other income and calculating withholding based on your total).

Key Takeaways

  • California bonuses are taxed as ordinary income at your regular tax rate, not at a special bonus rate.
  • Your employer withholds federal income tax, California state income tax, Social Security tax (6.2%), and Medicare tax (1.45%) from your bonus.
  • The percentage method often results in a 22% federal withholding and 9.3% California state withholding on bonuses issued separately from regular pay.
  • You may owe additional tax or receive a refund when you file your tax return, because withholding is an estimate and your actual tax liability depends on your full-year income.

Federal and California state income tax on bonuses

Federal income tax on a bonus depends on your tax bracket for the year. If your employer uses the percentage method for a separate bonus check, federal withholding is typically 22% on bonuses under $1 million. This is a flat withholding rate, not your actual tax bracket—so if you are in the 12% bracket, you may have too much withheld; if you are in the 24% bracket, you may have too little.

California state income tax on a bonus is withheld at 9.3% if your employer uses the percentage method. California's tax brackets range from 1% to 13.3% depending on your income, filing status, and other factors. Like the federal percentage method, the 9.3% withholding is an estimate and may not match your actual state tax liability.

When you file your tax return the following year, you report all income (including bonuses) and calculate your true tax owed. If too much was withheld, you receive a refund. If too little was withheld, you owe the difference.

Social Security and Medicare taxes on bonuses

Your bonus is also subject to Social Security tax at 6.2% and Medicare tax at 1.45%. These are payroll taxes that fund Social Security and Medicare programs. Unlike income tax withholding, these rates do not change based on your income level or tax bracket.

There is one exception: Social Security tax only applies to wages up to a certain limit each year. In 2024, that limit is $168,600. Once you reach that limit in a calendar year, no more Social Security tax is withheld from your remaining bonuses or paychecks for that year. Medicare tax, however, has no wage limit and applies to all bonuses.

If you work for more than one employer in the same year and your combined wages exceed the Social Security limit, you may have overpaid Social Security tax. You can claim a credit for the overpayment when you file your federal tax return.

How your employer decides what to withhold

Your employer chooses the withholding method based on how the bonus is paid. The percentage method treats the bonus separately and withholds a flat percentage (22% federal, 9.3% California). This is simpler for employers but often results in over- or under-withholding.

The aggregate method combines your bonus with your other wages for the pay period and calculates withholding as if all the money were regular pay. This method is more accurate but requires more calculation. Some employers use the aggregate method automatically; others only use it if you request it.

You can ask your employer's payroll department which method they use and whether you can switch methods. If you know a large bonus is coming and you want to reduce the withholding shock, you can also file a new W-4 form to adjust your withholding for that pay period.

What happens if too much or too little is withheld

Because bonus withholding is an estimate, your actual tax bill may differ from what was withheld. If your employer withheld more than you owe, you will receive a refund when you file your tax return. If your employer withheld less than you owe, you will have to pay the difference.

To avoid a large tax bill in April, some people ask their employer to withhold extra money from their bonus. You can do this by submitting a new W-4 form or by requesting additional withholding in writing. Your employer is required to honor requests for extra withholding.

If you expect to owe a significant amount, you can also make estimated tax payments to the IRS and California Franchise Tax Board throughout the year. This spreads the tax burden across multiple payments instead of one large bill at tax time.

Bonuses and your overall tax situation

A bonus can push you into a higher tax bracket if your total income for the year crosses a bracket threshold. For example, if your regular income puts you in the 22% federal bracket and a bonus pushes you into the 24% bracket, the bonus income is taxed at 24%, not 22%. This is called progressive taxation—higher income is taxed at higher rates.

California uses the same progressive system. Your bonus is added to your other income, and your total income determines your state tax rate. If you are close to a bracket threshold, a bonus can result in a higher effective tax rate than you might expect.

If you receive a bonus near the end of the year, you may want to review your W-4 to make sure your withholding for the rest of the year is correct. If too much is being withheld overall, you can adjust your W-4 to increase your take-home pay in your final paychecks.

Frequently Asked Questions

Is there a special bonus tax rate in California?

No. California taxes bonuses as ordinary income using the same tax rates that explore to your regular wages. There is no separate bonus tax or bonus tax rate. Your bonus is added to your other income, and your total income determines your tax bracket.

Why did my employer withhold 22% federal tax on my bonus?

Your employer likely used the percentage method, which withholds a flat 22% for federal income tax on bonuses issued separately from regular pay. This is a standard withholding rate, not your actual tax bracket. You may owe more or less when you file your return, depending on your full-year income and tax situation.

Can I get my bonus withholding back?

If too much tax was withheld from your bonus, you will receive a refund when you file your tax return. The refund comes from the IRS and California Franchise Tax Board after they calculate your actual tax liability based on your full-year income. Refunds typically arrive within a few weeks to a few months of filing.

Does Social Security tax explore to my entire bonus?

Social Security tax applies to your bonus only if your total wages for the year have not yet reached the annual limit (currently $168,600 in 2024). Once you reach that limit, no more Social Security tax is withheld from bonuses or paychecks for the rest of that year. Medicare tax applies to all bonuses with no limit.

What should I do if I think too little tax was withheld from my bonus?

You can request additional withholding by submitting a new W-4 form to your employer or by asking payroll to withhold extra money from future paychecks. You can also make estimated tax payments directly to the IRS and California Franchise Tax Board. Either approach helps you avoid a large tax bill when you file your return.