- ChatGPT can help you understand concepts and draft records, but it cannot file to HMRC or Companies House and you stay legally liable for anything it produces.
- An LLM has no live link to your bank, no professional indemnity, and no memory of your prior-year figures, so it can state a superseded rate or threshold with total confidence.
- AI is genuinely useful for learning terminology, sense-checking a figure you have already worked out, and drafting a question for your accountant, as long as a qualified person signs off the numbers.
Wondering if ChatGPT can do your bookkeeping? It can help you understand your accounts and draft records, but it can’t file anything to HMRC or Companies House, and you stay legally liable for every figure it produces.
An AI chatbot has no live connection to your bank, no HMRC agent status, and no professional indemnity behind its answers. It’s a capable assistant for some tasks and completely unsuitable for others.
So the honest answer isn’t “never touch it.” It’s knowing which jobs AI can help with, which it gets wrong, and where the legal line sits. Sleek’s whole approach is built on that split: AI does the heavy lifting, and a real, qualified accountant checks the numbers and stands behind them.
What AI handles well, task by task
When people try ChatGPT for accounting in the UK, they find it’s strong at the parts of bookkeeping that involve explaining, drafting, and reformatting, rather than the parts that touch real money or official records.
Think of it as a knowledgeable colleague who can talk you through a concept but can’t sign anything on your behalf. Here’s where it genuinely helps:
- Explaining concepts: Ask it what a VAT reverse charge is or how a director’s loan works, and it’ll give you a clear plain-English summary to check against official guidance.
- Drafting letters and policies: It can produce a first draft of an expenses policy or a query to send your accountant, ready for you to refine.
- Reformatting messy data: Paste an untidy CSV export and it’ll tidy the columns or restructure a table for a spreadsheet import.
- Pulling detail from documents: Upload a receipt or invoice and it can extract the vendor, date, and total for you to review.
Notice the pattern. Every task on that list ends with you checking the output. That’s the safe zone: AI drafts, a human verifies.
Where it falls over: the things AI can’t do reliably
ChatGPT starts to fail the moment a task needs your actual live data, your specific chart of accounts, or a guaranteed-correct figure. This is where the real AI bookkeeping risks sit, in the jobs where its confident tone is a genuine hazard rather than a help.
Categorising transactions without your context
AI can guess at transaction categories, but it doesn’t know your chart of accounts, so its guesses drift.
A payment to a supplier might be cost of sales for one business and an overhead for another. Without your bookkeeping setup in front of it, the model applies generic logic that quietly misclassifies entries. Small errors here compound into a distorted profit figure by year end.
Reconciling a bank feed
This one is a flat no. Reconciliation means matching every line on your bank statement to a record in your books, and an LLM has no live link to your bank account.
It can’t see your transactions, can’t pull your feed, and can’t flag the ones that don’t match. That job belongs to dedicated software connected to your bank, ideally reviewed by someone using our bookkeeping service.
Computing a VAT return
AI is unreliable on VAT scheme rules. The flat rate scheme, cash accounting, and the standard method all calculate differently, and the correct treatment depends on your registration and turnover.
A model may apply the wrong scheme or a stale rate without warning you it’s done so. Getting VAT wrong isn’t a minor slip either, given the penalties for getting filings wrong.
Preparing statutory accounts
Statutory accounts filed to Companies House use a tagged format called iXBRL. An LLM can’t produce a valid iXBRL file, so it simply can’t prepare accounts in the form the registrar accepts.
Why AI can’t file to HMRC or Companies House
Filing is the hard boundary, and it’s worth understanding why it’s a boundary rather than a limitation someone will patch next year.
To submit to HMRC you need one of three things: your own Government Gateway credentials, HMRC-recognised commercial software, or an authorised agent acting for you. An AI chatbot is none of these. It has no HMRC login, it isn’t recognised filing software, and it can’t become your agent.
Authorising an agent is a formal HMRC process. If you want someone to file on your behalf, you complete an authorisation so HMRC knows they’re acting for you. That’s how authorising an agent with HMRC works, and a chatbot has no way to sit inside that framework.
The same logic applies to Companies House. Confirmation statements, annual accounts, and incorporations all go through recognised channels tied to a verified identity. ChatGPT can tell you what a confirmation statement is. It cannot lodge one.
The confident-wrong-number problem
Here’s the risk that catches people out most. An LLM is trained on a snapshot of information, so it can state a rate, threshold, or fee that changed after that snapshot, and it’ll say it with total confidence and no warning.
UK tax figures move every single year. Personal allowances, VAT thresholds, corporation tax rates, and filing fees all shift, often at the Budget or the start of a tax year. A model that learned an old figure will happily repeat it.
Whenever AI gives you a specific number, treat it as a starting point and confirm it against GOV.UK before you rely on it. A figure with no source is a figure you can't trust.
A real example: the Companies House fee that doubled
This isn’t hypothetical. On 1 February 2026, Companies House increased its online incorporation fee from £50 to £100, and that change is now in effect. Same-day digital incorporation now costs £156 using approved software.
Ask an older AI model what it costs to register a company online and there’s a real chance it tells you £50. That answer was correct once. It’s wrong now, and nothing in the reply flags that the fee has changed.
|
Companies House fee (from 1 Feb 2026) |
Amount |
|
Online incorporation |
£100 |
|
Same-day digital incorporation (software only) |
£156 |
|
Paper incorporation |
£124 |
If you’d budgeted on the old £50 figure because a chatbot quoted it, you’d have started your company accounts on a wrong number. You can see current Companies House fees laid out in full, and it’s a useful habit to check the source rather than the summary.
What Making Tax Digital means for AI-assisted records
Making Tax Digital changes the picture further, because it dictates how your records must be kept and submitted, not just what they contain.
Making Tax Digital for VAT already applies to all VAT-registered businesses. Making Tax Digital for Income Tax is now live too: from 6 April 2026 it applies to sole traders and landlords with qualifying income over £50,000, extending to over £30,000 from April 2027 and over £20,000 from April 2028.
The catch for AI users is the software requirement. Making Tax Digital demands digital records kept in compatible software that connects directly to HMRC, and HMRC doesn’t provide that software itself. A chatbot isn’t Making Tax Digital compatible, so it can’t be the tool you keep your records in or file through.
You can read what Making Tax Digital requires in full, and if you already keep records in a tool like Xero, our guide to using Xero for your records shows how compliant record-keeping works in practice.
Who’s liable when an AI-prepared return is wrong?
You are. This is the part that matters most, so it’s worth being blunt about it.
When you submit a tax return, you’re the person legally responsible for its accuracy. That’s true whether you typed it yourself or were using AI for your tax return, and in the UK that responsibility can’t be shifted onto a tool. HMRC penalties for errors and late or incorrect filings land on you, not on the software or the chatbot.
An LLM carries no professional indemnity insurance. If a qualified accountant makes a mistake, they’re insured and accountable for it. If ChatGPT produces a wrong figure, there’s no one to hold responsible and no cover to fall back on. It also has no relationship with your prior-year figures, so it can’t spot the kind of year-on-year inconsistency a real accountant would question.
That’s the genuine reason to be careful here. It’s not that AI is useless. It’s that using it as your final authority puts a liability on your shoulders that you can’t pass anywhere else.
Sensible ways to use AI alongside an accountant
None of this means you should close the tab. Used well, AI is a real time-saver, as long as you treat any ChatGPT tax advice in a UK context as a prompt to verify, not a ruling. The trick is keeping it in the assistant role and never letting it be the final word on a number.
- Learn the terminology. Ask it to explain a term you keep seeing, then check the definition against official guidance.
- Draft a question for your accountant. Turn a vague worry into a clear, specific question before your next call.
- Sense-check a calculation you’ve already done. Use it as a second opinion on your own working, not as the source of the answer.
- Summarise dense HMRC guidance. Get the gist of a long page, then verify the detail on GOV.UK before acting.
The common thread is simple. AI helps you understand and prepare. A qualified person confirms and files. If you’d like a clearer sense of where a bookkeeper ends and an accountant begins, our comparison of the two roles is a good place to start.
How Sleek helps with AI and your bookkeeping
Sleek doesn’t reject technology, and we don’t hide behind it either. We use AI to do the heavy lifting on the repetitive work, exactly the tasks it’s good at.
The difference is who’s accountable for the result. On top of the automation sits accounting handled by qualified in-house accountants, our own team, never outsourced. AI does the work, a real accountant checks it, and that person is on the hook for your numbers.
That’s the one thing an AI tool on its own can’t offer, because it’s the review and the accountability that count, not the technology.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
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FAQs on AI bookkeeping and tax returns
Can AI file my tax return with HMRC?
No. AI tools like ChatGPT can’t file anything with HMRC, because submissions must go through your own Government Gateway account, HMRC-recognised software, or an authorised agent. A chatbot is none of those. It can help you understand what a return needs, but the actual filing has to happen through a recognised channel tied to a verified identity.
Is it safe to use ChatGPT for bookkeeping?
Only for the supporting tasks. It’s reasonably safe for explaining concepts, drafting queries, and tidying data you then review. It’s not safe as the source of your final figures, because it can’t see your live accounts and can state wrong numbers confidently. Keep it in an assistant role and have a qualified person confirm anything that hits your books.
Can AI categorise my business transactions accurately?
Not reliably. AI doesn’t know your chart of accounts, so it applies generic logic that can misclassify entries. The same supplier payment might be a cost of sales for one business and an overhead for another. It’s fine for a rough first pass, but every category needs checking against how your own books are actually structured before you trust it.
Will HMRC accept accounts prepared using AI?
Not in the form AI produces them. Statutory accounts must be filed in a tagged iXBRL format that an LLM can’t generate, and submissions go through recognised software. You can use AI to help understand your figures, but the accounts themselves have to be prepared and filed through compliant tools, ideally with a qualified accountant signing them off.
Who’s responsible if an AI tool gets my tax return wrong?
You are. The person submitting a return is legally responsible for its accuracy, and HMRC penalties land on you, not on the software. An AI tool carries no professional indemnity insurance, so there’s no cover and no one accountable if it produces a wrong figure. A qualified accountant, by contrast, is both insured and responsible for the work they sign off.
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Can I use ChatGPT to check my accountant’s work?
You can use it as a rough sense-check, but not as a verdict. It can help you understand a figure or flag something you want to ask about, which is useful. It can’t reliably audit a return, because it can’t see your full records or your prior-year position. If something looks off, raise it with your accountant rather than trusting the chatbot over them.
Does Sleek use AI in its accounting?
Yes. Sleek uses AI to handle the repetitive heavy lifting, then a qualified in-house accountant reviews the numbers and signs them off. That’s the whole point of the approach: the speed of automation with a real person accountable for the result. The technology does the work, and a human makes sure it’s right before anything is filed.
