As of 13 August 2026, AI can only partly calculate gross-to-net pay for your UK employees.
This still needs a person who signs their name to it.
Can you do it?
15 minutesto a draft.
1 hourto something you’d act on.
Cost, all in£0
Skill neededpower-user
Who has to check ita professional
What the alternative costsA payroll professional or dedicated payroll system is the alternative for checking and processing the calculation.
If this goes wrong, employees can be underpaid or overpaid and your PAYE records, deductions and payments can be wrong.
What to actually do
Hand it to a person
The route this page recommends
Someone with a licence or accountable authority has to sign this before it counts.
Use a tool built for this
Second choiceDo it yourself
The distant thirdA chat interface, power-user skill, and roughly 1 hour until you can act on the result.
How to actually do it
- Open the relevant GOV.UK PAYE and National Insurance guidance and your payroll records for the employee and pay period.
- Gather the gross pay, pay frequency, tax code, National Insurance category, pension contribution, student loan status, benefits, salary sacrifice and other deductions.
- Remove unnecessary names, addresses, National Insurance numbers and bank details before pasting the figures into the prompt.
- Paste the prompt and the employee's figures into a chatbot, then ask it to stop and list missing inputs if the information is incomplete.
- Compare every stated rate, threshold and rule with the current GOV.UK guidance and correct the calculation where the chatbot used an unsupported assumption.
- Enter the confirmed figures into your payroll software or send the calculation and source checks to your payroll professional before paying the employee or submitting PAYE information.
Prompt
Calculate an illustrative UK gross-to-net payslip for the employee details below. Use only the information I provide and clearly list anything missing before calculating. Do not invent tax rates, National Insurance rates, thresholds, allowances or payroll rules. If a current rule is needed, tell me exactly what must be checked against GOV.UK or current payroll software instead of guessing. Show each step separately: gross pay, taxable pay, income tax, employee National Insurance, pension, student loan, other deductions and net pay. State the assumptions, pay frequency, tax year, tax code, National Insurance category and pension treatment used. Produce a table with the calculation and a separate list of checks an employer must make before using it in payroll. This is not a payroll submission and not professional advice. Employee details: [gross pay and pay frequency] [tax code] [National Insurance category] [pension contribution and scheme basis] [student loan or postgraduate loan status] [benefits or salary sacrifice] [other deductions] [tax year] [any relevant payroll notes].
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
What it gets wrong
- AI cannot know whether your payroll records, tax codes and employee changes are current.
- AI cannot reliably apply every current HMRC rule to unusual benefits, salary sacrifice, irregular pay or corrections without authoritative inputs.
- AI cannot take responsibility for PAYE deductions, pension compliance, employee pay or payroll submissions.
- AI cannot replace the audit trail and controls in dedicated payroll software or a payroll professional's review.
What caps this at PARTLY: legal accountability, real time truth 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 | 0 |
| Effort delta | 1 |
| Total | 5 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can ChatGPT calculate gross-to-net pay?
- Yes, it can produce an illustrative calculation when you provide complete employee and payroll inputs. Do not use the result as the payroll record without checking current GOV.UK rules and having your payroll software or a payroll professional confirm it.
- What information do I need to calculate net pay in the UK?
- You need gross pay and pay frequency, tax code, National Insurance category, pension details, student or postgraduate loan status, benefits, salary sacrifice and other deductions. You also need the applicable tax year and current payroll rules.
- Is AI accurate for UK payroll?
- It can get the arithmetic right but still apply a wrong or outdated payroll rule. Compare the workings with GOV.UK and have a payroll professional check unusual cases, current settings and the final payroll.
- Can I use AI instead of payroll software?
- No. AI can help prepare or explain a draft, but it does not provide the payroll controls, records, submissions and accountability your business needs. This is not professional advice, and a serious or unusual case needs a payroll professional or accountant.
Nearby answers
- Can AI add a new employee to my UK payroll?PARTLY
- Can AI apply the correct tax code to an employee?NO
- Can AI audit my UK payroll for errors?PARTLY
- Can AI automate my UK payroll?NO
- Can AI calculate employee National Insurance deductions?YES
- Can AI calculate employer National Insurance contributions?PARTLY
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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