As of 13 August 2026, AI cannot complete your UK 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 neededpower-user
Who has to check ita professional
What the alternative costsThe supplied tool data gives no price for a UK corporation tax filing alternative.
If this goes wrong, your company can submit an incorrect return and remain responsible for the resulting HMRC consequences.
What to actually do
Hand it to a person
The route this page recommends
Someone with a licence or accountable authority has to sign this before it counts.
Use a tool built for this
Second choiceDo it yourself
The distant thirdA chat interface gets you a draft, but you cannot verify it yourself. That is the catch.
How to actually do it
- Open the current HMRC corporation tax return guidance and your company accounting records for the relevant accounting period.
- Gather the signed or draft accounts, trial balance, general ledger export, fixed asset schedule, loan records, dividend records, loss schedules, group-company details and previous HMRC correspondence.
- Remove unnecessary personal data, label each file with its source and period, and paste or upload the documents to an approved AI tool in separate, clearly named batches.
- Paste the prompt and ask the model to create a source-linked list of missing information, proposed figures, assumptions and items needing professional judgement.
- Compare every proposed figure with the trial balance, accounts and supporting schedules, and mark any mismatch or unsupported tax treatment rather than accepting the model's answer.
- Send the source documents, the AI's flagged questions and your comparison to a UK accountant or tax adviser for review and completion.
- Use the professional's approved figures and filing method to submit the return to HMRC, then retain the submitted return, computations and supporting records.
Prompt
Help me prepare, but do not complete or approve, a UK corporation tax return for [company name], covering the accounting period [start date] to [end date]. I will provide the company accounts, trial balance, corporation tax computations if available, fixed asset schedule, loan details, dividend records, loss information, group-company information and relevant HMRC correspondence. First list any missing documents and ambiguous facts. Then map each proposed figure to its source document and identify the relevant corporation tax return section or computation. Show calculations separately, state every assumption, and flag any item requiring a UK accountant or tax adviser. Do not invent figures, deadlines, reliefs or tax treatments, and do not guess where the records are incomplete. Do not submit anything to HMRC and do not present the result as filing-ready. End with a question-by-question checking list for a qualified professional. This is not professional advice.
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
What it gets wrong
- AI cannot take responsibility for the corporation tax treatment chosen for an unusual transaction, loss or group arrangement.
- AI cannot reliably tell whether your records support every figure or whether an omitted fact changes the return.
- AI cannot replace the professional review needed when the tax computation depends on judgement rather than arithmetic.
- The submission remains your company's responsibility, so an AI-generated return does not transfer liability to the tool.
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.
| Axis | Score (0–2) |
|---|---|
| Output | 1 |
| Inputs | 1 |
| Verification | 0 |
| Liability | 0 |
| Effort delta | 1 |
| Total | 3 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can ChatGPT complete my corporation tax return?
- No. It can organise records and draft a working paper, but it cannot take responsibility for the tax treatment or make the return safe to submit. A UK accountant or tax adviser should review and complete a serious case.
- Can AI calculate corporation tax for a small company?
- It can perform or explain calculations from figures you provide, but it may miss an adjustment, relief condition or unusual transaction. You still need a qualified person to verify the computation before filing with HMRC.
- Can I use AI to file my company tax return with HMRC?
- Not as a substitute for an accountable filing process. AI can help prepare documents and identify missing information, but your company remains responsible for the return and should use appropriate filing software or a professional.
- Is it safe to use AI for my corporation tax return?
- It is safer for document sorting and questions than for deciding tax treatments or producing the final return. This is not professional advice, and a UK accountant or tax adviser should handle a return involving uncertain figures, reliefs, losses or group companies.
Nearby answers
- Can AI complete my food business registration?PARTLY
- Can AI prepare my premises licence application?PARTLY
- Can AI apply to strike off my company?NO
- Can AI change my Companies House registered office?PARTLY
- Can AI change my company's registered office address?PARTLY
- Can AI complete a UK customs import declaration?NO
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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