As of 13 August 2026, AI can only partly work out your taxable income.

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

   How to actually do it

   1. Open your HMRC records and gather the figures for the relevant tax year from payslips, P60 or P45 documents, pension statements, bank interest records, dividend statements, invoices, property records and benefit statements.
   2. Put every figure into a spreadsheet with columns for source, date or period, amount, income type, expense type and whether the amount is personal, business or unclear.
   3. Remove account numbers, National Insurance numbers and other unnecessary personal information before pasting the spreadsheet or a labelled extract into an AI tool.
   4. Paste the prompt and data into the AI tool, asking it to calculate provisional taxable income rather than the tax bill and to list missing information separately.
   5. Check every extracted figure against the original document and compare employment, pension and other reported income with your HMRC records.
   6. For every disputed expense, allowance or income category, open the linked GOV.UK or HMRC guidance and ask an accountant or tax adviser to confirm the treatment before using the result in a return.

   Prompt

   Work out my provisional UK taxable income for [tax year] from the information below. Do not guess, fill gaps, or apply a relief or allowance unless the supplied information and a current GOV.UK or HMRC source clearly support it. First separate employment income, self-employment income, property income, savings income, dividends, pensions and any other income. Then separate allowable expenses from personal or non-allowable costs, showing the reason for each classification. Show every calculation in a table, state which figures are missing, distinguish taxable income from tax due, and give a low and high result only where an unresolved classification creates a genuine range. Link to the relevant GOV.UK or HMRC page for each important tax treatment. Flag anything that needs an accountant or tax adviser to decide. Use pounds and preserve the figures exactly as supplied.
   
   My information:
   [Paste your income, expense and tax documents or a clearly labelled list of figures here]
   
   My questions or uncertainties:
   [Paste them here]

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