Overtime Pay UK — Free Calculator 2025

Overview

Calculate Overtime Pay UK using the official rates and regulations for United Kingdom.

How it works

Enter the base amount and the calculator will apply the relevant rates and brackets to compute the result.

Understanding Overtime Pay Rights and Employer Obligations

In the UK, there is no statutory right to overtime pay, meaning employers are not legally required to pay a higher rate for hours worked beyond normal contractual hours. However, many employers offer enhanced overtime rates as an incentive, typically ranging from time-and-a-half (1.5x normal rate) to double time (2x normal rate) for weekends, bank holidays, or unsocial hours. The employment contract should specify whether overtime is paid, at what rate, and whether it is voluntary or mandatory. What the law does require is that all hours worked, including overtime, must be paid at least the National Minimum Wage or National Living Wage when averaged over the relevant pay reference period. This means if overtime hours bring the effective hourly rate below the minimum wage, the employer must increase pay to comply. The Working Time Regulations limit average working time to 48 hours per week over a 17-week reference period, unless the worker has signed an opt-out agreement. Workers cannot be forced to work more than 48 hours on average and cannot be dismissed or subjected to detriment for refusing to sign an opt-out. Understanding these rights helps workers ensure they are fairly compensated for additional hours while maintaining a healthy work-life balance.

Calculating Overtime for Salaried Workers

Overtime calculations for salaried workers require determining the effective hourly rate by dividing annual salary by the total hours worked in the year. For a full-time employee on a standard 37.5-hour week with 4 weeks holiday and 8 bank holidays, the annual hours are approximately 1,822, making a £35,000 salary equivalent to approximately £19.21 per hour. Time-and-a-half overtime would therefore be worth £28.82 per hour. However, if the employee regularly works unpaid overtime that brings actual hours to 45 per week, the effective hourly rate drops to approximately £16.18, potentially creating issues if it approaches minimum wage levels. The calculation must also account for regular overtime, commission, and bonuses when determining the reference rate for holiday pay purposes, following the Employment Appeals Tribunal decisions that established these payments must be included in holiday pay calculations. Employers who fail to include regular overtime in holiday pay calculations face back-pay claims from workers, which can be significant if the practice has continued for several years.

Tax Implications of Overtime Payments

Overtime pay is treated as regular employment income for tax and National Insurance purposes, subject to the same PAYE deductions as basic salary. This means a basic-rate taxpayer earning £20 per hour with time-and-a-half overtime at £30 per hour takes home approximately £20.40 per overtime hour after 20% income tax and 8% NI. For higher-rate taxpayers, the net overtime rate drops to approximately £15.30 per hour after 40% tax and 2% NI. Workers approaching the higher-rate threshold should be aware that significant overtime can push total income into the 40% band, reducing the marginal value of each additional hour worked. In some cases, the net benefit of overtime after tax and additional commuting or childcare costs may be minimal, making it important to calculate the true net gain before committing to additional hours. Our calculator shows the net take-home pay from overtime at different rates and tax bands, helping you decide whether the extra hours are financially worthwhile.

Using Our Overtime Pay Calculator

Our overtime pay calculator helps workers determine the gross and net value of overtime hours at different pay rates. Enter your basic hourly rate, the overtime multiplier, and the number of additional hours to see the extra gross pay and the take-home amount after tax and NI at your marginal rate. The calculator accounts for the interaction between overtime earnings and tax band thresholds, showing when additional hours push income into a higher tax band and reduce the effective overtime rate. For salaried workers, the calculator converts annual salary to an effective hourly rate before applying the overtime multiplier. This helps you make informed decisions about whether overtime is financially worthwhile, factoring in commuting costs, childcare, and the value of your personal time against the net additional income earned.