Finance Calc App

UK Overtime pay calculator

Work out your overtime pay and total weekly earnings — time-and-a-half, double time, or any premium rate — plus your blended hourly rate and what the extra hours add up to over a year.

By Mitch Duncan Last reviewed Methodology

Your hours & rate

Double-time hours (optional)

For premium days (public holidays, 7th consecutive day, etc.) paid at double the base rate.

Weekly gross pay
£1,300.00
Annualised gross
£67,600.00
Weekly pay breakdown
Regular pay (40h × £25.00)
£1,000.00
Overtime (8h × £37.50)
£300.00
Weekly gross
£1,300.00
Blended hourly rate
£27.08
Extra from overtime / week
£100.00
The overtime premium adds £100.00 a week beyond your base rate — about £5,200.00 a year if you keep these hours up. That premium is the part you'd lose by working the same hours at straight time.

Figures are gross (before income tax and any payroll deductions). Overtime is usually taxed at your normal marginal rate — it isn't taxed at a special higher rate, though a bigger paycheque can push more of your income into a higher bracket. This is an estimate, not pay or legal advice.

Want the full picture? Overtime and Bonus Pay Explained →

How overtime pay works in the UK

Unlike the US, the UK has no statutory right to an enhanced overtime rate. Whether you're paid extra for overtime — and at what multiple — is set entirely by your employment contract. Many employers do pay time-and-a-half (1.5×) or double time for weekends and bank holidays, but they aren't legally required to, as long as your average pay doesn't fall below the National Minimum Wage.

Overtime pay = base rate × your contractual multiplier × overtime hours

Worked example

At £25/hour, 40 regular hours plus 8 hours at time-and-a-half: regular pay is £1,000, the overtime rate is £37.50, and overtime pay is 8 × £37.50 = £300, for a £1,300 week. Enter whatever multiplier your contract actually specifies.

The Working Time Regulations

You can't be forced to average more than 48 hours a week (over a 17-week reference period) under the Working Time Regulations, unless you've signed an opt-out. Overtime counts toward that limit. The rules cover hours and rest breaks — not pay rates, which remain a contractual matter.

How overtime is taxed

Overtime is ordinary earnings taxed through PAYE at your marginal rate, with National Insurance on top. Because PAYE spreads your allowances evenly across the year, a big overtime month can look over-taxed on that payslip — but it self-corrects over the year. Watch the 40% higher-rate threshold and, above £100,000, the 60% effective band where the Personal Allowance tapers.

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Frequently asked questions

How is overtime pay calculated?
Multiply your base hourly rate by the overtime multiplier to get the overtime rate, then multiply that by your overtime hours. At a base rate of 25 with time-and-a-half, the overtime rate is 25 × 1.5 = 37.50 per hour. Your total pay is your regular hours at the base rate plus your overtime hours at the overtime rate.
What is time-and-a-half and double time?
Time-and-a-half means 1.5× your base rate — the most common overtime premium. Double time means 2× your base rate, often paid for public holidays, very long shifts, or a seventh consecutive working day. The calculator lets you set a primary overtime multiplier and add separate double-time hours.
Is overtime taxed at a higher rate?
No. Overtime is ordinary income taxed at your normal marginal rate — there's no special overtime tax. What can happen is that a larger paycheck triggers higher tax withholding for that pay period, or pushes more of your annual income into a higher tax band. Over a full year it evens out to your true marginal rate.
What is a blended or effective hourly rate?
It's your total pay divided by your total hours worked, including overtime. Because the overtime premium is spread across every hour, the blended rate sits between your base rate and your overtime rate. It's a quick way to see what each hour of your week is really worth once the premium is averaged in.
Am I entitled to overtime pay?
It depends on where you work and your employment terms. Some countries mandate an overtime premium by law (for example, time-and-a-half over a set weekly threshold), while in others it's set by your contract, award, or agreement and isn't guaranteed. Salaried or 'exempt' roles may not receive paid overtime at all — check your contract or local employment standards.
Does overtime count toward holiday pay or pension?
Sometimes. In several systems, regular overtime should be included when calculating holiday pay, and it may or may not attract pension or retirement contributions depending on local rules and whether it counts as ordinary earnings. Because this varies by country and employer, check your payslip and local guidance — this calculator shows gross overtime pay only.

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