How a Bonus Is Taxed in the UK

A bonus in the UK is taxed as ordinary earnings, which means it can attract income tax at 20%, 40% or 45%, employee National Insurance at 8% or 2%, and, for income between £100,000 and £125,140, an effective marginal rate of 60% (gov.uk). HMRC treats a bonus as part of total pay at the moment it is paid, not the period in which it was earned, so it lands in a single payslip and is deducted from at that payslip's rate (gov.uk).

That combination is why a bonus so often looks as though it has been taxed far more heavily than a normal month's salary. In most cases the headline deduction is correct for the moment it is applied, and any genuine overpayment corrects itself over the rest of the tax year through the way Pay As You Earn works.

This article explains exactly how income tax and National Insurance apply to a bonus, why the deduction can look punitive in the month it lands, which additional deductions a bonus can trigger, and the legitimate steps an employee or employer can take to reduce the tax due. Every figure below is drawn from HMRC guidance for the 2026-27 tax year.

Key takeaways

• A bonus is taxed exactly like salary: income tax at the marginal rate plus employee National Insurance, deducted through PAYE in the pay period it is paid.
• The employer also pays 15% employer National Insurance on the bonus above the Secondary Threshold, on top of what the employee sees deducted.
• A bonus often looks over-taxed in the month it lands because of how cumulative PAYE and emergency tax codes work, but a genuine overpayment usually corrects itself later in the year.
• A bonus that pushes adjusted net income between £100,000 and £125,140 is taxed at an effective 60% because the Personal Allowance tapers away.
• Bonus sacrifice into a pension removes both income tax and National Insurance from the sacrificed amount, making it one of the most effective ways to keep more of a bonus.
• A bonus can also trigger student loan and postgraduate loan deductions, because those are assessed on each pay period, not on annual salary.

How a bonus is taxed: the basics

A cash bonus is earnings for tax purposes. Under section 62 of the Income Tax (Earnings and Pensions) Act 2003, a bonus paid to an employee is taxable in the same way as salary, and HMRC guidance confirms it must be treated as part of the total pay at the time it is paid (gov.uk). There is no separate, gentler "bonus tax rate" in the UK. The money is simply added to the employee's pay for that period, and income tax and National Insurance are worked out on the combined figure.

Because the bonus stacks on top of regular pay in a single period, it is usually the top slice of income that month, and it is therefore taxed at the employee's highest marginal rate. An employee whose salary sits comfortably in the basic-rate band can still see part or all of a large bonus taxed at 40% if the bonus tips that month's earnings into the higher-rate band.

Income tax on a bonus

For an employee in England, Wales or Northern Ireland, income tax on a bonus follows the standard bands. The first £12,570 of income is covered by the Personal Allowance, income up to £50,270 is taxed at the basic rate of 20%, income from £50,270 to £125,140 is taxed at the higher rate of 40%, and income above £125,140 is taxed at the additional rate of 45% (gov.uk). A bonus is taxed at whichever of these rates applies to the band it falls into once it is added to salary.

The table below shows how the same £5,000 bonus is taxed very differently depending on where an employee's salary already sits, ignoring National Insurance for clarity.

The lesson is that the marginal position matters far more than the size of the bonus. Employers running payroll through HMRC-recognised UK payroll software apply the correct band automatically, but employees are often surprised because they compare the deduction against their normal average tax rate rather than their marginal rate (gov.uk).

National Insurance on a bonus

National Insurance is deducted from a bonus in the same pay period. For the 2026-27 tax year, employees pay Class 1 National Insurance at 8% on earnings between the Primary Threshold of £242 per week and the Upper Earnings Limit of £967 per week, and at 2% on earnings above the Upper Earnings Limit (gov.uk). A bonus paid to an employee already earning above the Upper Earnings Limit is therefore charged National Insurance at only 2%, which is why higher earners sometimes keep a larger proportion of a bonus than they expect on the National Insurance side, even as income tax bites harder.

Employers should not overlook their own liability. The employer pays secondary Class 1 National Insurance at 15% on the whole bonus above the Secondary Threshold of £5,000 per year (gov.uk). Because National Insurance must be recalculated on the total payment when an extra payment is made in an earnings period, the bonus is added to regular pay for the period and the contribution is worked out again on the combined amount (gov.uk). For a business, a £10,000 bonus is not a £10,000 cost: it is £10,000 plus up to £1,500 in employer National Insurance.

Why a bonus looks taxed at a higher rate than it is

Many employees are convinced their bonus has been "taxed at 50% or more" when the true annual position is nothing of the sort. The explanation lies in how PAYE spreads tax across the year, and in the tax code an employee happens to be on when the bonus lands.

Cumulative PAYE and the month the bonus lands

Standard PAYE is cumulative. Each time an employee is paid, the employer works out the income tax due on total pay for the year to date, then subtracts the tax already collected in earlier periods (gov.uk). In a normal month this keeps deductions smooth. When a large bonus lands, the year-to-date total jumps, the cumulative calculation charges tax on the combined salary-plus-bonus figure, and because earlier months carried little or no higher-rate tax, almost all of the incremental tax falls on the bonus itself.

That makes the single payslip look brutal. The important point is that the machinery is self-correcting. When pay returns to normal the following month, the cumulative calculation recognises that year-to-date tax paid now exceeds what is due, and deductions in later months fall to bring the balance back into line (gov.uk). Over a full tax year, an employee who stays within the basic-rate band ends up paying basic-rate tax on the bonus, even if the payslip in the bonus month suggested otherwise.

Emergency tax codes and non-cumulative deductions

The picture is worse, and slower to correct, when an employee is on an emergency tax code. Codes carrying a W1 or M1 suffix operate on a non-cumulative basis: each pay period is taxed in isolation, as though it were the first period of the year, with no reference to earlier months (gov.uk). A bonus paid under a W1 or M1 code cannot draw on unused allowance or basic-rate band from earlier in the year, so the deduction can be significantly larger than it would be under the correct cumulative code.

Emergency codes are common for new starters, employees who have recently changed jobs, or those who have started receiving a second income (gov.uk). Once HMRC issues the correct cumulative code, any overpayment is refunded through payroll or reconciled at the end of the tax year. Employers using HMRC-recognised payroll software for SMEs apply each new code as HMRC sends it, which shortens the time an employee spends over-taxed.

The marginal rates that make a bonus expensive

Beyond the standard bands, two features of the UK system can push the effective rate on a bonus well above the headline percentages. Both matter most for higher earners, and both are frequently misunderstood.

The 60% band between £100,000 and £125,140

The Personal Allowance is reduced by £1 for every £2 of adjusted net income above £100,000, so it is fully withdrawn once income reaches £125,140 (gov.uk). For every £100 of income in that range, £40 is taken in higher-rate income tax and a further £20 is effectively lost through the tapering of the allowance, producing an effective marginal rate of 60% (gov.uk). A bonus that carries an employee from just under £100,000 to somewhere inside that band is, pound for pound, the most heavily taxed money most people will ever earn.

Adjusted net income is the figure that matters here, and it is total taxable income less certain reliefs such as pension contributions made gross and Gift Aid donations (gov.uk). That definition is also the escape route, because reducing adjusted net income back below £100,000 restores the tapered allowance. This is covered in the reliefs section below.

Scotland's different bands

Employees whose main home is in Scotland pay Scottish rates of income tax on their earnings, set by the Scottish Parliament, and their tax code carries an S prefix (gov.uk). Scottish rates use more bands than the rest of the UK, including a higher rate of 42%, an advanced rate of 45% and a top rate of 48%, which means a bonus paid to a Scottish higher earner can be taxed several percentage points more heavily than the same bonus paid south of the border (gov.uk).

The table below sets out the Scottish bands for comparison with the rest-of-UK structure described above.

National Insurance is not devolved, so the 8% and 2% employee rates apply identically across the whole of the UK regardless of where an employee lives (gov.uk).

Other deductions a bonus can trigger

Income tax and National Insurance are not the only things a bonus can pull out of a payslip. Two further deductions catch employees out precisely because they are assessed on the pay period rather than on annual salary.

Student loan and postgraduate loan repayments

Student loan repayments through payroll are calculated on gross earnings in each individual pay period, at 9% of the amount above the plan threshold for that period (gov.uk). Because the threshold is applied per period and not annualised, a bonus that lifts a single month's pay above the monthly threshold triggers a deduction that month, even for an employee whose annual salary sits below the threshold (gov.uk).

The plan thresholds for the 2026-27 tax year, and the rate, are set out below. An employee with both a student loan and a postgraduate loan can face deductions under both at once, because the postgraduate loan is a separate 9% deduction with its own threshold (gov.uk).

The deduction taken on a bonus is not lost. It reduces the outstanding loan balance like any other repayment, and it is why student loan deductions can spike in a bonus month and then return to their usual level.

Pension auto-enrolment and the annual allowance

If a bonus counts as qualifying earnings under an auto-enrolment pension scheme, employee pension contributions are deducted from it in the normal way, which reduces take-home further but builds the employee's retirement pot. Whether a bonus is pensionable depends on the scheme's definition of pensionable pay, so this varies between employers.

There is also a ceiling to keep in mind. Tax relief on pension contributions is limited by the annual allowance, which is £60,000 of total contributions for most people in the 2026-27 tax year, including employer contributions (gov.uk). Directing a very large bonus into a pension is highly tax-efficient up to that ceiling, but contributions above the annual allowance trigger a tax charge that claws back the relief (gov.uk).

How the tax on a bonus can be reduced

None of the following is avoidance. Each uses a relief HMRC has deliberately built into the system, and each is available to ordinary employees through their employer's payroll.

Bonus sacrifice into a pension

Bonus sacrifice is the single most effective legitimate way to keep more of a bonus. The employee agrees, before the bonus is paid, to give up the cash in exchange for an equivalent employer pension contribution. Because the money is never paid as salary, no income tax and no National Insurance are deducted from the sacrificed amount, and the full sum lands in the pension (gov.uk). This is more efficient than paying a bonus as cash and then contributing to a pension, because the ordinary route recovers income tax but not the National Insurance already deducted (gov.uk).

The employer benefits too. Employer National Insurance at 15% is not due on a pension contribution made through salary sacrifice, and some employers pass part or all of that saving into the employee's pension, increasing the amount invested (gov.uk). The arrangement must be a genuine variation of the employment contract agreed in advance, and it must not take the employee's cash pay below the National Minimum Wage (gov.uk).

Restoring the Personal Allowance and other reliefs

For an employee caught in the 60% band, a pension contribution does double duty. It attracts higher-rate tax relief, and it reduces adjusted net income, which restores some or all of the tapered Personal Allowance (gov.uk). An employee whose bonus pushes income to £110,000 can, by contributing £10,000 to a pension, bring adjusted net income back to £100,000 and recover the full allowance, so the effective relief on that contribution is far larger than the headline 40%.

Gift Aid donations work the same way for adjusted net income, since they are deducted in the calculation alongside gross pension contributions (gov.uk). A more specialised route exists where a company operates an Employee Ownership Trust, which can pay qualifying bonuses of up to £3,600 per employee free of income tax, though National Insurance still applies to those payments in the normal way (gov.uk).

What employers must get right when paying a bonus

For the employer, a bonus is a payroll event that has to be reported correctly and on time. The bonus is included in the Full Payment Submission for the period in which it is paid, and the income tax, employee National Insurance and employer National Insurance are all reported through Real Time Information (gov.uk). Software that holds the HMRC Recognised badge submits the FPS automatically and applies the current rates and thresholds without manual reconfiguration, which matters most in a bonus month when the numbers are larger and the margin for error is smaller.

RTI reporting, directors and timing

Company directors are a special case. Directors are assessed for National Insurance on an annual basis even when they are paid monthly, so a bonus voted to a director is added to their cumulative annual earnings and National Insurance is charged at the rate relevant to the tax year in which the bonus is voted (gov.uk). This annual method can produce a very different National Insurance result from the period-by-period method used for ordinary employees, and it is a frequent source of error for owner-managed businesses paying themselves a low salary plus a bonus (gov.uk).

Timing also carries a compliance edge. Because a bonus is taxed in the period it is paid, the date an employer chooses to pay it can move the liability between tax years and between an employee's marginal bands (gov.uk). Platforms and bureaux that embed payroll through an HMRC-recognised payroll API can model the effect of a bonus before it is committed, so the reporting is right the first time.

Work out the take-home value of a bonus

Before promising a bonus figure or planning what to do with one, both employer and employee can size the real outcome with the Moonworkers UK salary calculator, which applies the 2026-27 PAYE and National Insurance rules to any gross figure and shows the take-home result.

Conclusion

A bonus in the UK is not taxed by a special rule. It is taxed as the top slice of earnings, at whatever marginal rate that slice falls into, with National Insurance and often student loan deductions layered on top and employer National Insurance sitting behind it. Most of the "my bonus was taxed at 50%" alarm comes not from the true annual position but from the way PAYE front-loads the deduction in the month the bonus lands, a distortion that the cumulative system usually unwinds over the rest of the year.

The practical conclusion is that planning beats surprise. An employee who understands their marginal band, checks their tax code, and considers bonus sacrifice where it fits can keep materially more of a bonus, while an employer who reports it correctly through Real Time Information avoids the penalties that come with getting a large one-off payment wrong. As more pay is delivered through flexible and variable structures, the ability to model a bonus before it is paid is becoming a routine part of running payroll rather than a specialist exercise.

Frequently asked questions

Why does my bonus get taxed so heavily in the month I receive it?

A bonus is added to that month's pay and taxed as the top slice of income, so it is charged at the highest marginal rate that applies once it is stacked on top of salary. Cumulative PAYE also charges the incremental higher-rate tax against the bonus itself, and if the employee is on an emergency W1 or M1 code the deduction is larger still because each period is taxed in isolation (gov.uk). Where too much has been deducted, the balance usually corrects itself over the following months or at the end of the tax year.

Can I pay my whole bonus into my pension to avoid tax?

Yes, through bonus sacrifice, provided the arrangement is agreed before the bonus is paid. No income tax or National Insurance is deducted from the sacrificed amount, and the full sum goes into the pension (gov.uk). The main limit is the annual allowance of £60,000 of total pension contributions for most people, above which a tax charge applies (gov.uk).

Do I pay National Insurance on a bonus if I already earn a high salary?

Yes, but the rate is often lower than employees expect. Employee National Insurance is charged at 8% between the Primary Threshold and the Upper Earnings Limit of £50,270 a year, and at only 2% above that limit (gov.uk). An employee already earning above £50,270 therefore pays just 2% National Insurance on the bonus, even though income tax may apply at 40% or 45%.

Will a bonus increase my student loan repayments?

It can, because student loan repayments are worked out on each pay period rather than on annual salary. A bonus that lifts a single month's earnings above the monthly threshold for the relevant plan triggers a 9% deduction on the excess for that month, even if annual pay sits below the threshold (gov.uk). The deduction reduces the outstanding loan balance and pay returns to its normal deduction level the following month.