As of 13 August 2026, AI can only partly check which of your business expenses are tax deductible.

What to actually do

1. 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.

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 the relevant GOV.UK and HMRC guidance on allowable business expenses, and note whether you are checking income tax, corporation tax, VAT or more than one.
   2. Gather the expense list, receipts, invoices, dates, amounts, VAT details, business purpose and any private-use information, then redact bank details and other unnecessary personal data.
   3. Record your business structure and accounting period, and paste those details together with the expense list into the prompt.
   4. Ask the chatbot to produce the table and source links, then answer its missing-information questions from your records rather than allowing it to assume facts.
   5. Compare each straightforward classification and cited rule with the current GOV.UK or HMRC page, marking any item whose facts or treatment do not match.
   6. Send mixed-use, high-value, unusual or unclear items and the checked table to your accountant or tax adviser before including them in the accounts or tax return.

   Prompt

   You are helping me review business expenses under current UK tax rules. This is not professional advice. Do not make a final decision for me and do not invent rules, figures or facts.
   
   My business structure is: [sole trader, partnership or limited company]
   The tax treatment I need is: [income tax, corporation tax, VAT, or more than one]
   The relevant accounting period is: [dates]
   
   Review the expense list below. For each item, create a table with:
   1. expense description
   2. amount and currency
   3. date
   4. business purpose
   5. provisional result: likely allowable, likely not allowable, or needs accountant review
   6. which tax it relates to
   7. the rule or current GOV.UK or HMRC source supporting the result
   8. facts that could change the result
   9. records or evidence I should retain
   
   Separate the cost of the item from VAT where the information allows it. Do not guess whether I am VAT registered, whether an expense was used privately, or whether an item is wholly and exclusively for business. Mark missing information as a question instead. Flag mixed-use costs, travel, meals, clothing, home working, vehicles, finance costs, entertaining, capital items, gifts, subscriptions and anything unusual for an accountant or tax adviser. Use current UK guidance only, identify any point you cannot verify, and give me a short list of the items that should not be claimed without professional confirmation.
   
   Expense list:
   [paste the expense descriptions, dates, amounts, receipts or notes here]

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