Reviewed by Mustafa Bilgic
Founder, WebCalculator
Overtime rules follow GOV.UK guidance; tax uses 2026/27 HMRC rates. Your contract sets your overtime rate. Estimates only — not financial or employment advice.
Working extra hours? Enter your hourly rate, your normal and overtime hours and the overtime multiplier to see exactly what those extra hours are worth — weekly and over a year.
Standard plus overtime hours
Overtime is usually paid at a higher rate than your standard hours — most commonly time and a half (1.5×) or double time (2×). The maths is simple: your overtime hourly rate is your normal rate multiplied by the overtime factor, and your overtime pay is that rate times the overtime hours.
So at £15 an hour, 5 hours of time-and-a-half overtime is £15 × 1.5 × 5 = £112.50 on top of your normal weekly pay.
| Multiplier | £15/hr becomes | 5 hours pay |
|---|---|---|
| Plain (1×) | £15.00 | £75.00 |
| Time and a quarter (1.25×) | £18.75 | £93.75 |
| Time and a half (1.5×) | £22.50 | £112.50 |
| Double time (2×) | £30.00 | £150.00 |
No — there is no special "overtime tax". Overtime is added to your normal pay and taxed at your usual Income Tax and National Insurance rates. It can feel like more is deducted if the extra pay tips part of your income into the higher-rate band, but only the slice above the threshold is taxed at 40%. See the full effect on your take-home with the take-home pay calculator, or convert your base rate with the hourly wage calculator.
Multiply your normal hourly rate by 1.5 to get the overtime rate, then by the overtime hours. At £15 an hour, time and a half is £22.50 an hour.
At time and a half the rate is £22.50, so 5 overtime hours pay £112.50 on top of your normal earnings. At double time it would be £150.
No. Overtime is taxed at your normal Income Tax and NI rates — there's no special overtime tax. More can be deducted only if the extra pay pushes part of your income into a higher band.
Not by law — overtime rates are set by your contract. The only rule is that your average pay across all hours must stay at or above the National Minimum Wage for your age.