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NO

As of 13 August 2026, AI cannot amend your corporation tax return.

This still needs a person who signs their name to it.

Can you do it?

15 minutesto a draft.

n/ait cannot be self-verified.

Cost, all in£0

Skill neededchat-fluent

Who has to check ita professional

What the alternative costsNo price for an accountant or tax agent amending a corporation tax return is provided in the available source data.

If this goes wrong, the company submits an incorrect amendment and may face additional tax, interest, penalties or an HMRC enquiry.

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 gets you a draft, but you cannot verify it yourself. That is the catch.

    How to actually do it

    1. Open the submitted company tax return, accounts, tax computation, corporation tax payment records and any HMRC correspondence that relates to the proposed amendment.
    2. Make a dated copy of the records and remove irrelevant personal data before pasting the relevant text and figures into the prompt.
    3. Paste the documents and figures into the prompt and ask the chatbot to produce the change table, evidence list and questions for a UK corporation tax professional.
    4. Compare every original and proposed figure in the chatbot's table with the submitted return, accounts and source records, and correct any transcription or arithmetic error.
    5. Ask a UK accountant or tax adviser to decide the tax treatment, confirm the amendment route and check whether the proposed change affects other returns, payments or disclosures.
    6. Give the professional the checked table and supporting records, then have the authorised person submit the amendment through the applicable HMRC process and retain the submission confirmation.

    Prompt

    I need help preparing to amend a UK company corporation tax return, but do not file anything or give a final tax treatment. Use only the documents and figures I provide. First, list the exact return entries and supporting records that appear to need changing. Then create a table with: original figure, proposed figure, difference, source document, reason for the change, and an uncertainty note. Flag missing evidence, inconsistent dates, arithmetic errors and any issue that needs a UK corporation tax professional. Do not invent figures, reliefs, deadlines or legal conclusions. Do not assume that an accounting treatment is tax treatment. End with a concise question list for my accountant or tax adviser and a separate checklist of information they should confirm before any amendment is submitted. Documents and figures: [paste them here]. HMRC correspondence or reason for amendment: [paste it here].

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

What it gets wrong

  • AI cannot accept responsibility for the amended return or act as the company’s accountable tax representative.
  • AI cannot reliably decide whether an accounting adjustment produces the correct UK corporation tax treatment.
  • AI cannot see undisclosed transactions, prior advice, linked-company circumstances or the full history behind the original return.
  • AI cannot replace a professional’s judgement about evidence, disclosure, penalties, interest or the appropriate amendment route.
  • AI cannot make an unverified draft safe merely by presenting it in a neat table.

What makes this a NO: legal accountability, regulated advice and verification cost.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

AxisScore (0–2)
Output1
Inputs1
Verification0
Liability0
Effort delta1
Total3 / 10

The methodology and its thresholds are published in full.

FAQ

Can ChatGPT amend my corporation tax return?
No. It can organise your records and draft a proposed change list, but it cannot take responsibility for the tax treatment or submit an accountable amendment. This is not professional advice, and a serious or uncertain case needs a UK accountant or tax adviser.
Can AI check my corporation tax return?
It can compare figures and identify missing documents or obvious inconsistencies in the material you provide. It cannot establish that the treatment complies with the current UK corporation tax rules, so a professional must check any proposed amendment.
How do I correct a mistake on my corporation tax return?
Gather the submitted return, accounts, tax computation, source records and HMRC correspondence, then identify the exact entries and evidence affected. Confirm the correction and the applicable HMRC amendment process with an accountant or tax adviser before submitting anything.
Do I need an accountant to amend my corporation tax return?
You may be able to handle a straightforward clerical correction yourself, but that does not make the tax treatment or the resulting liability safe to assess without expertise. Use a UK accountant or tax adviser where the change involves reliefs, losses, expenses, connected companies, uncertainty or possible penalties.

Nearby answers

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Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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