As of 13 August 2026, AI can only partly appeal a UK VAT penalty.

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 VAT penalty notice and the relevant GOV.UK guidance, then save the notice, reference, stated reason, amount and appeal instructions in one working document.
   2. Gather the relevant VAT return submission record, payment record, HMRC messages and a dated chronology of what happened, removing unnecessary personal data before pasting anything into an AI tool.
   3. Paste the documents and chronology into the prompt, and ask the model to identify missing facts without filling gaps or assuming that the explanation is a reasonable excuse.
   4. Compare every extracted date, figure, reference and quotation in the draft against the original penalty notice and HMRC records, correcting the draft where they differ.
   5. Check the proposed appeal route and any deadline directly on GOV.UK and on the penalty notice, rather than relying on the model's summary.
   6. Ask a UK tax adviser or accountant to check the grounds and evidence where the amount is material, the facts are disputed or the case involves repeated penalties, insolvency, fraud allegations or an HMRC review.
   7. Send the final appeal through the route stated by HMRC, keeping a copy of the submission, attachments and proof of sending.

   Prompt

   Help me prepare an appeal against a UK VAT penalty. This is not professional advice, so do not present uncertain legal conclusions as facts and tell me when a UK tax adviser or accountant should review the case.
   
   Use only the information and documents I provide. Invent nothing. First extract:
   - the penalty type and amount
   - the VAT period involved
   - the date and reference on the penalty notice
   - the stated reason for the penalty
   - any appeal route or deadline shown on the notice
   - the relevant events in date order
   - evidence that supports my explanation
   
   Then produce:
   1. a short, neutral summary of the case;
   2. a list of factual points that need checking against the original records;
   3. possible appeal grounds, clearly separating established facts from questions and assumptions;
   4. a draft appeal to HMRC in plain British English;
   5. a document checklist showing which evidence supports each point;
   6. a submission checklist, including what must be checked on GOV.UK and on the penalty notice before sending.
   
   Do not claim that HMRC must cancel the penalty. Do not invent a reasonable excuse, deadline, VAT rule, case reference or legal authority. If the evidence is insufficient, say exactly what is missing. Flag any issue involving repeated penalties, large sums, fraud allegations, insolvency, an HMRC review or a dispute about the underlying VAT return for review by a UK tax adviser or accountant.
   
   My information and documents:
   [PASTE THE PENALTY NOTICE, RELEVANT HMRC LETTERS, A CHRONOLOGY, THE VAT PERIOD, AND SUPPORTING EVIDENCE HERE]

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