Overtime Calculator
Enter your base rate, overtime hours, and multiplier to see your gross overtime pay — and optionally estimate the tax and NI on your extra earnings.
How much will you earn from overtime? Whether you are paid time-and-a-half, double time, or standard rate, this calculator shows your gross overtime earnings and can estimate the tax impact.
See how much extra you will actually take home after tax and National Insurance.
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What this calculator does
This calculator works out your overtime pay based on your base rate, the number of overtime hours, and the overtime multiplier. It can also estimate the income tax and National Insurance on your overtime earnings.
Who it is for
Employees working overtime who want to know how much extra they will earn, and what they will actually take home after tax.
How to use it
Enter your base hourly rate (or annual salary), standard weekly hours, overtime hours, and select your overtime multiplier. Optionally enable tax estimation to see your take-home overtime pay.
How the calculation works
Overtime pay = base hourly rate × multiplier × overtime hours. Tax estimation works by comparing your total annual income (base + overtime) against base-only income to calculate the marginal tax and NI on the overtime portion.
Worked example
Base rate £15/hour, 10 hours overtime at 1.5x: Overtime rate = £22.50/hour. Gross overtime = £225. If your base salary is £29,250/year, the overtime would be taxed at 20% basic rate + 8% NI, giving approximately £162 take-home.
Assumptions and limitations
- Tax estimation uses 2025/26 UK tax rates and thresholds
- Assumes overtime is additional to your standard contracted hours
- NI rates may differ if you are over state pension age
- Does not account for salary sacrifice schemes or other deductions
- Employer overtime policies vary — check your contract
Frequently asked questions
Is overtime taxed at a higher rate?
Overtime is taxed as normal income. It is added to your base pay, so if it pushes you into a higher tax bracket, the overtime in that bracket is taxed at the higher rate. This is why take-home from overtime can feel lower than expected.
What does time and a half mean?
Time and a half (1.5x) means you are paid 150% of your normal hourly rate for each hour of overtime. If your base rate is £15/hour, time and a half pays £22.50/hour.
Do employers have to pay overtime in the UK?
There is no legal requirement to pay overtime in the UK, but your overall pay must not fall below the National Minimum Wage for all hours worked. Overtime terms should be set out in your employment contract.
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Related guides
- How Overtime Pay Works in the UK — Understand your overtime pay rights, how it is taxed, and how different multipliers affect your earnings.
- How to Calculate Your Freelance Day Rate — A practical guide to setting your day rate as a freelancer or contractor, including salary equivalence and market benchmarks.
- How Holiday Accrual Is Calculated in the UK — Learn how holiday builds up over a leave year and how to check how much you have accrued so far.
- Inside IR35 Explained: What UK Contractors Need to Know — A clear guide to working inside IR35, how it affects your take-home pay, and what it means for your contract.
- How Holiday Entitlement Works in the UK — A practical guide to understanding your statutory holiday entitlement as a UK worker, covering full-time, part-time, and irregular working patterns.
- Outside IR35 Explained for UK Contractors — What outside IR35 means, how it affects your take-home pay, and the key differences between inside and outside IR35.
Sources and references
HMRC tax rates 2025/26 (https://www.gov.uk/income-tax-rates), National Minimum Wage (https://www.gov.uk/national-minimum-wage-rates)
Last updated
Last reviewed: 2025-04-12.