No, bonuses aren't inherently taxed at exactly 50%, but a large chunk can be withheld upfront, often at a flat 22% federal rate (or 37% for bonuses over $1 million) for supplemental wages, plus Social Security (6.2%) and Medicare (1.45%), making it feel high; however, it's just withholding, and you reconcile the actual tax (which could be less or more) when you file your annual return.
When you add a bonus to the equation, that bonus is supplementary and wasnt factored into the calculation that was done above for your normal paychecks. As a result, the tax liability for that bonus income will fall in your top tax bracket. so bonuses are withheld at a higher rate.
The percentage method
The withholding rate for supplemental wages is 22 percent. That rate will be applied to any supplemental wages, such as bonuses, up to $1 million during the tax year. If your bonus totals more than $1 million, the withholding rate for any amount of the bonus above $1 million is 37 percent.
Things to know about the tax impact of bonuses. By now, you may be wondering, “Why are bonuses taxed so high?” It's because the IRS considers bonus pay to be supplemental income. Therefore, the IRS treats it differently than standard income.
You can't entirely avoid taxes on a bonus, but you can significantly lower the amount by contributing to tax-advantaged accounts (401(k), IRA, HSA), deferring the bonus to a year you expect to be in a lower tax bracket, or making charitable donations, thereby reducing your taxable income or increasing deductions at tax time.
For a higher rate taxpayer, a £10,000 bonus will instantly be whittled down to £6,000 by income tax. National insurance at 2% would take a further £200, leaving you with just £5,800 of your £10,000 bonus. However, there is a way to (legally) reduce the tax you pay on your bonus, and that's with bonus sacrifice.
A flat withholding rate of 10.23% applies to all bonuses in California, regardless of the employee's regular income bracket. Employers may use the percentage method (22% flat) or the aggregate method (combine with paycheck) for federal withholding, which can affect the upfront tax taken out.
Bonus contributed pre-tax to super
For example, tax on a $50,000 bonus: Paid to you and your marginal tax rate is 32.5% = $16,250. Paid to you and your marginal tax rate is 37% = $18,500.
The general rule is that employees are taxed at the rate of the marginal tax bracket in which they fall. Let's explain: if their salary is between R 1 and R 216 200, they are in the 18% tax bracket and therefore their bonus will be taxed at 18%.
Tax withholding on bonuses
For federal taxes, when an employee receives $1 million or less in supplemental wages during 2025 and those wages are identified separately from regular wages, the flat withholding rate is 22 percent.
It's possible that a bonus or a pay increase can put you in a higher tax bracket. That means you will pay a higher tax rate on each additional dollar you earn. Some people think they may actually have less after-tax income because of a bonus, but this is not true.
The federal bonus tax withholding rate is typically 22%. However, employers could instead combine a bonus with your regular wages as though it's one of your usual paychecks—with your usual tax amount withheld. There are ways to reduce the tax impact of your bonus.
A $5,000 windfall is a great opportunity to build a foundation for long-term financial security. The right move depends on your current goals, debt, and emergency savings. Paying off high-interest debt is one of the most financially effective uses.
Keep in mind that a bonus may push you into a higher tax bracket. But, you are subject to a higher rate only on the portion of income that falls into that bracket.
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Your bonus may have been taxed at a higher rate than what you're used to because the IRS treats it like supplemental, not regular, income. Employers either withhold at a flat 22% rate or combine it with your regular paycheck under the aggregate method, which can make the total withholding seem larger.
Impact of a bonus taking your earnings over 100k
Let's say you earn a £100k salary and – good news – you've been awarded a £1,000 bonus. Ready for the bad news? Not only will this bonus be taxed at 40% (leaving you with £600), but you also lose £500 from your tax-free personal allowance.
One of the most notable differences between bonuses and raises is the duration of the compensation. Bonuses are one-time, short-term financial rewards. A raise is an increase to your current salary for the foreseeable future and provides more long-term benefits.