As of 13 August 2026, AI can only partly correct an error on your VAT return.

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 the submitted VAT return, VAT account and bookkeeping records for the affected period, then record the original net, VAT and gross figures.
   2. Gather the invoices, credit notes, purchase records, sales records and calculations that explain the error, and remove unnecessary personal data before sharing anything with a chatbot.
   3. Open the current VAT error-correction guidance on GOV.UK and copy its relevant text or link into the chatbot with the prompt.
   4. Paste the prompt and your factual records, asking the chatbot to reconcile the original and corrected figures without deciding facts you have not supplied.
   5. Compare every calculation with your VAT return and accounting records, and compare the proposed correction route with the current GOV.UK guidance rather than relying on the chatbot's summary.
   6. Give the reconciliation, source documents and unanswered questions to your accountant or tax adviser, then use the HMRC route they confirm and retain the correction evidence with your VAT records.

   Prompt

   I need help checking a possible error on a UK VAT return. Do not submit anything, make assumptions, or give me professional advice. Use current HMRC guidance on GOV.UK where possible and provide the relevant GOV.UK links.
   
   Facts:
   - VAT registration and scheme details: [insert relevant details]
   - VAT return period: [insert period]
   - Return already submitted: [yes/no]
   - Error discovered: [describe exactly what happened]
   - VAT treatment originally used: [standard-rated, zero-rated, exempt, outside scope, reverse charge, or unsure]
   - Correct treatment you believe applies: [insert if known]
   - Net, VAT and gross figures originally reported: [insert figures]
   - Correct net, VAT and gross figures: [insert figures]
   - Currency and rounding used: [insert details]
   - Supporting records available: [list invoices, credit notes, payment records and calculations]
   
   First, reconcile the original and corrected figures and show the arithmetic. Then explain which facts are still missing. Next, identify whether the issue appears to be an error in the submitted return, a transaction-classification issue, or something else. Set out the possible HMRC correction route without choosing one for me, and quote the current GOV.UK guidance supporting each step. Flag anything that needs an accountant or tax adviser, especially an unusual, disputed or material error. Finish with a short checklist of records to retain and questions to ask the professional reviewing it.

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