California taxes bonuses as regular income, not at a special rate

Your bonus is taxed the same way as your regular salary in California. There is no separate bonus tax bracket or bonus-only deduction. Instead, your employer withholds federal income tax, Social Security tax, Medicare tax, and California state income tax based on the total amount you receive, using the same tax tables they use for your regular paycheck.

The confusion often comes from how your employer calculates the withholding. Some companies use the percentage method, which applies your normal withholding rate to the bonus amount. Others use the aggregate method, which adds the bonus to your regular pay for that period and recalculates withholding on the combined total. Both methods are legal, but they can produce different results on your paycheck.

The amount withheld is not the same as the amount you actually owe. Withholding is an estimate. When you file your tax return the following year, California and the IRS will calculate what you actually owe based on your total income, deductions, and credits. You may get money back, or you may owe more.

Key Takeaways

  • Bonuses are taxed as ordinary income at your regular tax rate, with no special bonus tax in California.
  • Your employer withholds federal, state, Social Security, and Medicare taxes from the bonus using either the percentage method or the aggregate method.
  • The amount withheld is an estimate; your actual tax bill is determined when you file your return and depends on your total year income and deductions.
  • California's top state income tax rate is 13.3% for high earners, but your bonus is taxed at whatever bracket your total income falls into.
  • If too much tax is withheld from your bonus, you will receive the overpayment as a refund when you file; if too little is withheld, you will owe the difference.

How your employer calculates withholding on a bonus

When you receive a bonus, your payroll department has two standard ways to figure out how much tax to take out. The percentage method treats the bonus as a separate payment and applies your usual withholding percentage to just that amount. If you normally have 20% withheld from each paycheck, your employer withholds 20% of the bonus and nothing more.

The aggregate method is more common for larger bonuses. Your employer adds the bonus to your regular pay for that pay period, calculates withholding on the combined total using the tax tables, and then subtracts the withholding already taken from your regular paycheck. The difference is what comes out of the bonus. This method often results in higher withholding because it pushes your income into a higher tax bracket temporarily.

You cannot choose which method your employer uses—that is set by company policy. However, you can adjust your withholding by filing a new Form W-4 with your employer before the bonus is paid. If you expect a large bonus and want less withheld, you can claim additional allowances on the W-4. If you want more withheld to avoid owing taxes later, you can request extra withholding in the "Other Income" section of the form.

California state income tax on bonuses

California's state income tax applies to your bonus just like it applies to your salary. The state uses a progressive tax system with rates ranging from 1% on the lowest income to 13.3% on income over $680,063 (for the 2024 tax year; this threshold changes annually). Your bonus is added to your other income for the year, and the combined total determines which tax bracket applies.

This means a bonus does not automatically push you into the highest tax bracket. Instead, your bonus is taxed at the marginal rate—the rate that applies to your next dollar of income. If you earn $100,000 in salary and receive a $20,000 bonus, the bonus is taxed at whatever rate applies to income between $100,000 and $120,000, not at the rate for your entire income.

California also has a Mental Health Tax of 1% on income over $1 million, which took effect in 2024. If your bonus pushes your total income over $1 million for the year, that portion above $1 million is subject to this additional tax on top of the regular state income tax.

Federal income tax, Social Security, and Medicare on bonuses

Federal income tax withholding on your bonus follows the same rules as California state tax. Your employer uses the IRS tax tables to calculate how much federal tax to withhold, based on your W-4 and the method they choose (percentage or aggregate). The federal tax rate depends on your total income for the year and your filing status, not on the bonus itself.

Social Security tax is withheld at a flat rate of 6.2% on wages up to a certain limit. For 2024, that limit is $168,600 per year. Once you reach that limit, no more Social Security tax is withheld from any additional income, including bonuses. Medicare tax is withheld at 1.45% on all wages with no limit, plus an additional 0.9% Medicare tax on wages over $200,000 (single filers) or $250,000 (married filing jointly).

If you receive a bonus late in the year and have already paid the maximum Social Security tax through your regular salary, your bonus will not be subject to Social Security tax. This is one situation where a bonus can result in less total withholding than you might expect.

What happens when you file your tax return

The withholding taken from your bonus is credited toward your total tax bill for the year. When you file your California and federal tax returns, the IRS and California Franchise Tax Board calculate your actual tax based on your total income, deductions, and credits. They compare that to the total amount withheld from all your paychecks and bonus payments throughout the year.

If more was withheld than you actually owe, you receive a refund. If less was withheld, you owe the difference. The amount of the refund or payment depends on your entire financial picture for the year, not just the bonus. For example, if you had a large bonus but also had significant deductible expenses or made large charitable donations, your actual tax bill might be lower than the withholding suggests.

You will receive a Form 1099-NEC or Form 1099-MISC if your bonus was paid as non-employee compensation, or it will appear on your Form W-2 if it was paid as regular wages. Make sure the amount on the form matches what you actually received, because that is what the IRS and California use to verify your return.

Strategies to manage bonus tax withholding

If you know a bonus is coming and want to reduce the amount withheld, you can file a new Form W-4 before the bonus is paid. Claim additional allowances to lower withholding, but be aware that this affects your regular paychecks too. You will need to adjust your W-4 again after the bonus is paid to return to your normal withholding.

Another option is to request that your employer withhold a specific dollar amount in the "Other Income" section of the W-4. This gives you more control than claiming allowances and does not affect your regular paycheck withholding. Some employers also allow you to request extra withholding if you want to may support you do not owe taxes when you file.

If your bonus is large enough to push you into a higher tax bracket, you might benefit from spreading the bonus across two tax years if your employer allows it. This is not common, but some companies offer the option. Consult a tax professional if you are considering this, because the rules are complex and depend on your specific situation.

Bonuses and estimated tax payments

If you are self-employed or have income that is not subject to withholding, you may need to make quarterly estimated tax payments to California and the IRS. A bonus paid to a W-2 employee does not usually trigger estimated tax payments, because withholding is already being taken out. However, if your bonus is so large that the withholding is not enough to cover your actual tax bill, you might owe money when you file.

To avoid this, you can request additional withholding from your bonus check. Ask your payroll department to withhold extra federal and state income tax beyond what they normally would. This is the simplest way to may support you do not underpay your taxes for the year.

Frequently Asked Questions

Is there a special tax rate for bonuses in California?

No. Bonuses are taxed as ordinary income at your regular marginal tax rate. California does not have a separate bonus tax or a lower rate for bonuses. The amount withheld depends on how your employer calculates it, but your actual tax is determined by your total income for the year.

Why is more tax withheld from my bonus than from my regular paycheck?

Your employer may be using the aggregate method, which adds the bonus to your regular pay for that period and recalculates withholding on the combined total. This can push you temporarily into a higher tax bracket, resulting in more withholding on the bonus. The extra withholding is credited to your tax bill and may result in a refund when you file your return.

Can I reduce the tax withheld from my bonus?

You can file a new Form W-4 before the bonus is paid to claim additional allowances or request a specific dollar amount of withholding. However, remember that the amount withheld is not the same as the amount you owe. If you reduce withholding and do not actually owe less tax, you will have to pay the difference when you file your return.

What if my bonus pushes me over $1 million in income?

Income over $1 million is subject to California's 1% Mental Health Tax in addition to regular state income tax. Your employer should withhold this tax from your bonus, but verify that it appears on your pay stub. If not, contact payroll to may support the correct amount is withheld.

Will I get a refund if too much tax is withheld from my bonus?

Possibly. If the total withholding from all your paychecks and bonus payments exceeds your actual tax bill for the year, you will receive a refund when you file your return. The refund depends on your entire income, deductions, and credits, not just the bonus.