Does Overtime Count as Taxable Income in the UK?
Yes — overtime pay is fully taxable income in the UK. There is no exemption or special treatment for overtime. Every pound you earn through overtime is subject to Income Tax and National Insurance in exactly the same way as your regular salary. However, how PAYE handles overtime payments can sometimes create the impression of being overtaxed in a given month, even when the annual total is correct. This guide explains how it works.
How overtime is taxed through PAYE
PAYE is a cumulative system. Your employer calculates tax on a running total of your income and tax paid since the start of the tax year (6 April). Each payslip, the employer works out what total income you will have earned by year end (based on your current earnings rate), calculates the total annual tax due, and deducts the appropriate amount for the pay period.
When you work overtime, your earnings for that month are higher than usual. PAYE works correctly in the cumulative system — the extra income is taxed at the appropriate rate, and if this temporarily takes you into a higher band in one month, the cumulative calculation will self-correct in subsequent months.
Why overtime can look "overtaxed" in the short term
The confusion often arises when overtime is paid through a different payroll run or in a "Week 1/Month 1" (non-cumulative) basis. If your employer processes a large overtime payment separately from the regular payroll — for example, as an ad-hoc payment — and applies it on a Month 1 basis (as if you had earned this amount every month), it will project your annual income very high and deduct more tax than necessary for the year. However, this corrects itself in subsequent months once the regular payroll catches up and recalculates on a cumulative basis.
Overtime and the higher rate threshold
If your regular salary is below £50,270 but overtime pushes your total annual earnings above that threshold, the portion above £50,270 will be subject to 40% income tax rather than 20%. This is correct and unavoidable — crossing the higher rate threshold means paying higher rate tax on the portion above it.
Example: Regular salary £47,000. Overtime in one tax year totals £6,000. Total earnings: £53,000. The £2,730 between £50,270 and £53,000 is taxed at 40%. The rest remains at 20%. The "overtime tax" is not a special rate — it is simply the normal higher rate applying to income above the threshold.
NI on overtime
Overtime earnings are also subject to National Insurance in the normal way. The 8% rate applies to earnings between £12,570 and £50,270 per year, and 2% applies to earnings above £50,270. If overtime takes your annual earnings above the Upper Earnings Limit (£50,270), the NI rate on the excess drops from 8% to 2% — a small saving.
Voluntary vs compulsory overtime
There is no tax distinction between voluntary and compulsory overtime. Both are taxable earnings. However, compulsory overtime must be included when calculating whether a worker meets the National Minimum Wage — voluntary overtime is optional, but compulsory overtime hours are factored into the NMW hourly rate calculation.
Frequently asked questions
I worked a lot of overtime this month and the deduction looks huge. Will I get money back?
Probably yes, in the following months. If your overtime was processed on a cumulative basis (the normal method), your employer's software will calculate the correct tax for the year to date each month. If you were overtaxed in month 3 due to a high overtime payment, months 4–12 will show lower deductions as the year-to-date calculation catches up. You should receive the correct net pay over the full year without needing to claim a refund. If the tax year ends and you still appear to have overpaid, HMRC will issue a P800 refund notice.
Does overtime affect my Student Loan repayments?
Yes. Student Loan repayments are calculated on all earnings above the relevant threshold. Overtime pushes your earnings higher and increases your repayment in the months when the overtime is paid. This is correct — repayments are based on actual income, not just base salary.