Can ChatGPT calculate overtime pay?

Yes, it can calculate gross overtime from supplied hours, rates and policy rules. You must check the inputs and arithmetic against the employee's contract and payroll records before using the result.

How do I calculate overtime pay in the UK?

Use the overtime hours multiplied by the applicable overtime rate or multiplier, following the employee's contract or overtime policy. Check the result separately for payroll deductions and relevant UK rules, because the calculation depends on the arrangement.

Can AI calculate overtime for salaried employees?

It can calculate a result if you provide the agreed method for converting salary into an hourly rate, the normal hours and the overtime rule. It must not invent that conversion, and the result still needs checking against the contract and payroll process.

Is it safe to use AI for payroll calculations?

It is suitable for a draft calculation, not for transferring responsibility for payroll accuracy. This is not professional advice, and a serious, repeated or disputed case needs a payroll professional or accountant.

PARTLY

As of 13 August 2026, AI can only partly calculate overtime pay for your UK employees.

This still needs a person who signs their name to it.

Can you do it?

5 minutesto a draft.

30 minutesto something you’d act on.

Cost, all in£0

Skill neededchat-fluent

Who has to check ityou

What the alternative costsThe supplied tool data gives no price for a payroll accountant or payroll service.

If this goes wrong, an employee may be underpaid or overpaid and you may need to correct payroll, answer a dispute and deal with any resulting compliance consequences.

What to actually do

Hand it to a person
The route this page recommends
A person who owns the outcome does this end to end, worth it when the failure is dear.
Use a tool built for this
Second choice

Do it yourself

The distant third

A chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.

How to actually do it

Open each employee's contract, overtime policy and current payroll record, and copy the clauses and figures that determine normal hours, overtime rates, pay periods, breaks and rounding.
Create a table with an employee identifier, pay type, salary or hourly rate, normal hours, overtime hours, overtime multiplier or rate, relevant dates or shifts and unpaid breaks.
Paste the copied policy wording and completed table into the prompt, then ask the model to stop and ask questions instead of filling any missing figures.
Check each displayed rate, multiplier, hour total and arithmetic against the contract, overtime policy and source payroll records.
Use a calculator or spreadsheet to reproduce the gross overtime total for every employee and resolve any difference before approving the figures.
Send the checked gross figures and the unresolved compliance questions to the person running payroll, or to a payroll professional or accountant for a serious or disputed case.

Prompt

Calculate the gross overtime pay for the UK employees listed below. Use only the figures and rules I provide. Do not invent missing inputs or assume an overtime rate, rounding rule, salary-to-hourly conversion, unpaid-break treatment or pay-period treatment. If anything is missing or contradictory, ask a precise question before calculating.

For each employee, show:
1. The ordinary pay basis used.
2. The overtime hours used.
3. The overtime rate or multiplier used.
4. The calculation in plain arithmetic.
5. Gross overtime pay for the relevant pay period.
6. Any assumptions, exclusions or unresolved issues.

Keep gross overtime separate from PAYE tax, National Insurance, pension deductions and employer costs. Do not give legal conclusions. Flag where the contract, overtime policy, National Minimum Wage rules, working-time rules or payroll treatment need checking against current GOV.UK guidance or with a UK payroll professional. State clearly if the supplied data is insufficient.

Pay period: [for example, weekly or monthly]
Overtime policy or contract wording: [paste the relevant wording]
Rounding rule: [paste the rule, or write unknown]
Employee data:
[paste a table containing employee name or identifier, pay type, salary or hourly rate, normal hours, overtime hours, overtime multiplier or rate, dates or shifts, and any unpaid breaks]

Return a table followed by the calculation for each employee and a list of checks I must complete before sending the figures to payroll.

Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

What it gets wrong

AI cannot know which contract, overtime policy or informal working arrangement is current unless you provide it.
AI cannot decide whether an unusual payment arrangement complies with UK employment, working-time or minimum-wage rules.
AI cannot take responsibility for correcting an underpayment, answering an employee dispute or making a payroll filing.
AI cannot reliably detect a missing shift, incorrect timesheet or inaccurate source record.
AI cannot replace a payroll professional when the calculation affects several pay rules or is disputed.

What caps this at PARTLY: legal accountability, context depth and verification cost.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

Axis	Score (0–2)
Output	2
Inputs	1
Verification	1
Liability	1
Effort delta	2
Total	7 / 10

The methodology and its thresholds are published in full.

FAQ

Can ChatGPT calculate overtime pay?: Yes, it can calculate gross overtime from supplied hours, rates and policy rules. You must check the inputs and arithmetic against the employee's contract and payroll records before using the result.
How do I calculate overtime pay in the UK?: Use the overtime hours multiplied by the applicable overtime rate or multiplier, following the employee's contract or overtime policy. Check the result separately for payroll deductions and relevant UK rules, because the calculation depends on the arrangement.
Can AI calculate overtime for salaried employees?: It can calculate a result if you provide the agreed method for converting salary into an hourly rate, the normal hours and the overtime rule. It must not invent that conversion, and the result still needs checking against the contract and payroll process.
Is it safe to use AI for payroll calculations?: It is suitable for a draft calculation, not for transferring responsibility for payroll accuracy. This is not professional advice, and a serious, repeated or disputed case needs a payroll professional or accountant.

Nearby answers

All Payroll rulings

Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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