As of 13 August 2026, AI can only partly calculate PAYE tax for your employees.

What to actually do

1. Hand it to a person

   The route this page recommends

   Someone with a licence or accountable authority has to sign this before it counts.

2. Use a tool built for this

   Second choice

3. Do it yourself

   The distant third

   A chat interface, power-user skill, and roughly 1 hour until you can act on the result.

   How to actually do it

   1. Open the current GOV.UK PAYE and payroll guidance and the relevant HMRC payroll calculator, then note the tax year, pay frequency and pay date for this payroll run.
   2. Export or gather the payroll register, employee tax codes, National Insurance categories, year-to-date totals, pension records, student loan details, statutory payments and taxable benefits.
   3. Remove unnecessary personal identifiers and paste the remaining figures into the prompt using one clearly labelled block per employee.
   4. Paste the prompt into a chatbot and require it to stop rather than guess when a tax code, year-to-date figure, payroll basis or deduction is missing.
   5. Enter each employee's figures into the HMRC calculator or your payroll software and compare PAYE tax, National Insurance, deductions and net pay with the AI table.
   6. Give differences, unusual tax codes, starters, leavers, statutory payments and benefits to a payroll professional or accountant before using the figures for payment or RTI reporting.

   Prompt

   Calculate a draft UK PAYE payroll for the pay period below. This is not professional advice and must not be treated as the final payroll calculation.
   
   Employer and payroll details:
   - Pay period: [weekly, fortnightly, four-weekly or monthly]
   - Pay date: [date]
   - Tax year: [tax year]
   - Payroll basis: [cumulative or week 1/month 1 where applicable]
   
   For each employee, use only the information supplied and do not invent missing figures:
   - Employee identifier: [name or code]
   - Gross taxable pay for this period: [amount in pounds]
   - Tax code and suffix: [code]
   - Tax basis or indicator: [details shown in the payroll record]
   - Taxable pay and PAYE tax year to date: [amounts]
   - Employee National Insurance category: [letter]
   - Employee National Insurance year to date: [amount]
   - Pension contribution and salary-sacrifice details: [details]
   - Student or postgraduate loan plan: [plan or none]
   - Benefits, statutory payments, attachment orders or other deductions: [details or none]
   - Previous employment or starter information relevant to this pay period: [details or none]
   
   For each employee, show the inputs used, taxable pay, estimated PAYE income tax, employee National Insurance, student or postgraduate loan deduction where relevant, pension deduction, net pay, and the employer-side figures separately. Show the calculation steps and state every assumption. If any input is missing, ambiguous or outside a normal case, stop that employee's calculation and list the exact information needed instead of guessing. Distinguish clearly between a draft calculation and figures ready for an RTI submission. Flag anything that must be checked against current GOV.UK or HMRC payroll guidance and state that a payroll professional or accountant should approve the final result.

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