As of 13 August 2026, AI can only partly appeal an HMRC decision for your business.

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 1 hour until you can act on the result.

   How to actually do it

   1. Open the HMRC decision notice and save a copy, then redact irrelevant personal data and account details before pasting it into a chatbot.
   2. Gather the business records that relate to the decision, including correspondence, invoices, returns, calculations and evidence of any disputed facts, and label each document with its date.
   3. Open GOV.UK and the HMRC pages linked from the decision notice to check the current appeal route and any deadline, then paste the relevant instructions and links into the prompt.
   4. Paste the notice, correspondence, confirmed instructions and your factual account into the prompt and ask for the issue table, evidence gaps, draft appeal and checklist.
   5. Compare every date, amount, reference number, tax period and factual statement in the draft against the original HMRC notice and business records, removing anything you cannot prove.
   6. Send the checked draft and supporting documents to a UK accountant, tax adviser or solicitor for a merits and deadline review before submitting it through the channel stated in the HMRC notice.
   7. Submit the final appeal using the address or online route in the notice, keep a copy of everything sent and retain proof of submission.

   Prompt

   Help me prepare a factual draft appeal to HMRC about the business decision described below. This is not professional advice. Do not decide that the appeal will succeed, invent facts, invent evidence, cite legislation or HMRC guidance unless you can identify the exact source, or assume a deadline that is not stated in the decision notice or confirmed on GOV.UK.
   
   First, make a table with: the HMRC decision, the date of the decision, the stated appeal deadline, the tax or accounting period, the amount involved, the reasons HMRC gives, and the action HMRC says I should take. Mark anything missing or ambiguous as "needs confirmation".
   
   Second, list each point I may need to challenge. For each point, separate: what HMRC says, the evidence I have, the evidence still needed, the factual response I can safely make, and the issue that needs a UK tax adviser or solicitor. Do not suggest a position that conflicts with the documents.
   
   Third, draft a concise appeal letter in plain British English. Address it to the correct HMRC office shown on the notice, include the reference numbers, state that I appeal the decision, set out the grounds in numbered sections, list the attachments, and request confirmation of receipt. Use bracketed prompts only where information is missing. Do not claim that an attachment exists unless I provide it.
   
   Fourth, provide a submission checklist. Include the deadline shown in the notice, the required channel and address shown in the notice, documents to attach, facts I must verify, and questions to ask a UK accountant, tax adviser or solicitor before sending. Tell me which statements in the draft must be checked against the original records.
   
   Source documents and facts:
   [PASTE THE HMRC DECISION NOTICE, WITH UNNECESSARY PERSONAL INFORMATION REDACTED]
   [PASTE RELEVANT HMRC CORRESPONDENCE]
   [PASTE THE BUSINESS'S FACTS AND EVIDENCE]
   [PASTE ANY DEADLINE OR SUBMISSION INSTRUCTIONS YOU HAVE CONFIRMED ON GOV.UK]

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