Overtime Pay Calculator

Overtime Pay Guide

What do I need to know about UK Overtime Law?

There is no statutory right to overtime pay in the UK — it is down to your employment contract. However, if overtime hours bring your average hourly pay below the National Living Wage (£11.44/hr from April 2024), that is illegal. Many employers offer time and a half (1.5×) for overtime as a contractual term. Some offer double time for bank holidays or Sundays. Working Time Regulations limit the average working week to 48 hours over 17 weeks, but workers can opt out individually. Zero-hours contracts have no guaranteed minimum hours, so 'overtime' in the traditional sense doesn't really apply — all hours worked are simply paid at the agreed rate unless a premium is specifically offered.

What do I need to know about Calculating Overtime Pay?

Standard overtime calculation: Regular pay = hourly rate × regular hours. Overtime pay = hourly rate × overtime multiplier × overtime hours. Total = regular + overtime. Example: £15/hr, 37.5 regular hours, 5 overtime hours at time and a half: Regular = £15 × 37.5 = £562.50. Overtime = £15 × 1.5 × 5 = £112.50. Total = £675. The effective earnings for the week increase not just from the overtime hours but from the premium rate applied to them.

Is Overtime Worth It?

For basic rate taxpayers (under £50,270 total income), overtime earnings are taxed at 20% income tax + 10% NI = 30% deduction on overtime pay. For higher rate taxpayers, overtime above the threshold is taxed at 40% + 2% NI = 42%. Working more hours may also incur childcare costs, commuting costs, and reduce time for rest and recovery. The financial value of overtime depends heavily on your marginal tax rate and personal circumstances. For shift workers, LIFO shift patterns (last in, first out) often mean newer staff get offered more overtime, which can be a useful way to boost income early in a role.

What should I know about Night Shifts and Weekend Premium Pay?

Many employers pay premiums beyond statutory requirements for unsociable hours: nights (midnight–6am) often attract 15–30% premium, weekends 10–25%, bank holidays 50–100% (double time is common). NHS and emergency services have nationally negotiated unsocial hours allowances. Check your contract or collective bargaining agreement for specific rates. Night workers are legally limited to an average of 8 hours per 24-hour period and are entitled to free health assessments.

What's the key thing to understand about Overtime Rules and Exemptions?

Not every employee is automatically entitled to overtime pay, and the rules depend on jurisdiction and job classification. In the US, the Fair Labor Standards Act generally requires overtime pay (typically at one and a half times the regular rate) for non-exempt employees who work more than 40 hours in a workweek, but many salaried employees in executive, administrative, professional, or certain other roles are classified as 'exempt' and not entitled to overtime regardless of hours worked, provided they meet specific duties and salary-level tests set out in the regulations. In the UK, there's no general legal right to overtime pay at all unless it's specified in the employment contract — some employers pay a premium rate for overtime as a matter of policy or to attract staff, others pay the standard rate, and some don't pay for overtime hours beyond a contracted number at all, though hours worked must still be compatible with the Working Time Regulations' limits on average weekly hours (unless an opt-out agreement is signed). Because classification and contractual terms vary so much, checking your own contract and, in the US, your exemption status, is essential before assuming a particular overtime rate applies to your situation.

What should I know about Overtime and Your Take-Home Pay?

Overtime pay is taxed the same way as regular earnings — it's simply added to your income for the pay period and taxed at your marginal rate, there's no separate 'overtime tax rate' despite a common misconception that overtime is taxed more heavily. What does happen, and what fuels that misconception, is that a one-off week or month with substantial overtime can push your pay for that period into a higher tax bracket or withholding bucket than your normal pay, making the tax withheld from that specific paycheck look disproportionately large compared with a normal paycheck — this generally evens out over the tax year as a whole rather than being a permanent extra cost, and any overpayment is typically reconciled when the year's total tax position is finalised. Regularly worked overtime also affects calculations that use average or recent earnings, such as mortgage affordability assessments (lenders often only count a percentage of regular overtime, and some require a track record of at least a year or two before including it at all), statutory sick pay or parental leave calculations in the UK, and pension contributions where these are calculated as a percentage of earnings including overtime. Because consistent overtime genuinely does raise your long-run income, it's worth checking whether pension contributions and other percentage-based benefits are correctly capturing it, rather than only the tax treatment.

Worked Example: Time-and-a-Half Overtime on Top of a GBP13 Base Rate

An employee on a GBP13 an hour base rate works a standard 38-hour week plus 6 hours of overtime paid at time-and-a-half (1.5x), a common contractual overtime premium though not a legal requirement in the UK (there is no statutory right to an overtime premium at all, only to be paid at least minimum wage for all hours worked, including overtime hours).

The overtime hours alone add GBP117 to the week, which is 23.7% of the total pay for working 15.8% more hours — the premium rate means overtime hours are worth proportionally more per hour than standard hours, which is the entire incentive point of time-and-a-half from the employer's perspective as much as the employee's. Annualising this pattern (6 hours of overtime every week, 52 weeks a year) would add GBP6,084 a year on top of the base salary — a figure worth keeping in mind for anyone treating consistent overtime as reliable income for a mortgage application, since lenders typically only count a portion of regular overtime (and sometimes require 2-3 years of payslips or P60s showing consistency) rather than treating it the same as guaranteed basic salary.

Double Time, Bank Holidays and When the Overtime Rate Actually Doubles

Double time (2x base rate) is the highest common overtime premium, typically reserved by contract for specific circumstances: working on a bank holiday that would otherwise be a day off, working on a Sunday for employees whose contract treats Sunday as a rest day, or being called in on a scheduled day off at very short notice. As with time-and-a-half, double time is a contractual matter, not a statutory entitlement — the law only guarantees the National Minimum Wage or National Living Wage as a floor on every hour worked, overtime included. A common source of confusion is bank holidays that fall on a day someone would not normally work anyway (for example, a part-time worker whose fixed days are Tuesday to Thursday, when a Monday bank holiday occurs). Whether that worker receives any benefit from the bank holiday at all depends entirely on their contract and how their holiday entitlement has been calculated to account for bank holidays — many contracts simply fold bank holidays into the general statutory 5.6-week allowance rather than granting them as additional days on top, which means a worker whose normal days never fall on a bank holiday may not automatically gain an extra day off purely because of the public holiday. Employers in retail, hospitality, and healthcare — sectors where bank holiday working is routine rather than exceptional — frequently negotiate specific bank holiday premiums (sometimes time-and-a-half, sometimes double time, occasionally a flat allowance) precisely because the standard overtime rules do not neatly answer what should happen on a public holiday that falls on an otherwise normal working day.