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GovMath.

Tax & Salary · Updated 2025

Overtime Calculator

Most UK workers don’t have a legal right to enhanced overtime pay — it depends on your contract. But where time-and-a-half or double-time applies, the maths is straightforward.

£
hrs
hrs

Weekly gross

£742.50

£38,610.00 annualised (×52)

Breakdown

  • Regular: 37.5 hrs × £15.00
    £563
  • Overtime: 8 hrs × £22.50
    £180
  • Weekly gross
    £743

How we calculated your result

Regular pay = base hourly × regular hours. OT pay = base hourly × multiplier × OT hours. We sum to a weekly gross and annualise by 52.

Official UK rules in simple English

  • No statutory premium for overtime in UK law — contractual only.
  • Average pay over a 48-hour week (Working Time Regs) unless opted out.
  • Overtime counts towards holiday pay (52-week reference period).
  • Overtime is subject to PAYE income tax and NI like normal pay.

Common pitfalls to watch out for

  • ⚠ Regular overtime affects holiday pay

    If you regularly do paid OT, your statutory 4 weeks of holiday must be paid at a 52-week average — not just basic rate.

  • ⚠ Tax bracket creep on big OT months

    A heavy OT month can push you into the 40% band — temporary, but feels painful. Sort out at tax-year-end via SA if owed.

  • ⚠ Salaried staff often have no claim to OT

    Salary means salary — if your contract says ‘such hours as required to do the job’, you may have no entitlement to extra pay.

Frequently asked questions

What's standard overtime in the UK?
There’s no standard — common arrangements are time-and-a-half (×1.5) on weekdays and double time (×2) on Sundays/bank holidays.
Do agencies pay overtime?
Often only at single rate after 8 hours. Check the Agency Worker Regulations once you’ve been on placement 12+ weeks.

Calculator estimates gross pay only. Net depends on tax code and NI category.

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