Home › Answers › UK law, tax and HMRC
Can ChatGPT do my tax return?
Short answer
No. ChatGPT can't file a Self Assessment return with HMRC, and you shouldn't rely on it for your figures. It can explain terms, help you sort expenses into categories and draft questions for your accountant. The return itself goes through HMRC's online service or HMRC-recognised software, and you're responsible for every number on it.
What AI can safely help with
- Explaining what a box or term means ("what are payments on account?")
- Turning a messy list of costs into categories you can check against GOV.UK's allowable expenses
- Drafting a checklist of documents to gather before the deadline
- Writing a clear email to your accountant or to HMRC
- Spotting gaps, such as a month with no fuel receipts
What it shouldn't do
- Calculate your tax bill. Rates, allowances and thresholds change, and AI can quote last year's figures confidently. Use HMRC's own calculation when you file online, or our self-employed tax calculator as an estimate.
- Decide what's allowable. If you're unsure, GOV.UK says to contact HMRC.
- Hold your UTR, National Insurance number or bank details. Keep those out of any AI chat.
Making Tax Digital
From 6 April 2026, sole traders and landlords with qualifying income over £50,000 in 2024 to 2025 must keep digital records and send quarterly updates using compatible software. The threshold falls to £30,000 from April 2027 and £20,000 from April 2028. Several of the HMRC-recognised packages include AI features for categorising transactions; that's the sensible place for AI in your tax admin. See our Making Tax Digital guide and can AI do my bookkeeping?
A prompt that helps without risk
I'm a UK sole trader [trade]. Here's a list of my costs for the year with no personal details: [list]. Group them into likely Self Assessment expense categories, flag anything that might be personal or capital rather than an allowable expense, and list questions I should ask my accountant. Don't calculate tax.
Related questions
Can I claim the cost of AI software against tax?
Usually, if it's for the business. See can I claim ChatGPT as a business expense?
When is the Self Assessment deadline?
For online returns, 31 January after the end of the tax year. Late filing brings penalties; our Self Assessment penalty calculator shows how they build up.
Sources
- GOV.UK: Expenses if you're self-employed
- GOV.UK: Self Assessment tax returns
- GOV.UK: Making Tax Digital for Income Tax
Checked 17 October 2026. Rules and prices change, so check the source before you rely on it. This is general information, not legal, tax or financial advice.
More on uk law, tax and hmrc
- Can AI images be illegal in the UK?
- Can ChatGPT write a contract?
- Do I have to tell customers I use AI?
- Does HMRC use AI?
- How can solicitors use AI in the UK?
- Is AI regulated in the UK?
All uk law, tax and hmrc answers · All answers · Guides · AI tools directory
Get one useful AI tool in your inbox each weekday
Free, plain English, five minutes to read. Unsubscribe any time.
See our privacy notice.