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ChatGPT explains the rules.
Finn keeps your books.

ChatGPT is a great general assistant. AccountsOS is an AI accountant for your company: Finn works on your real books, shows where each answer came from, and files MTD VAT once you sign it off.

Try Finn free for 14 days See the difference

£20/month for a limited company. No card for the trial.

Side by side

	ChatGPT on its own	AccountsOS with Finn
Your books	Only what you paste or upload into a chat.	A double-entry ledger of your company, kept up to date from your statements, receipts and invoices.
Tax answers	General answers. It may not say where a figure came from, or which tax year it is for.	Rates and rules come from a checked library and GOV.UK guidance, with the source linked under the answer.
Remembers your company	Within a chat, and in memory if you turn it on.	Your company's year end, VAT scheme, directors and past decisions, every time.
Figures you can check	A number in a reply.	Each account in your profit and loss opens the entries behind it, for the same dates.
Record of changes	Your chat history.	An audit log of who changed what and when, including every change Finn made.
VAT returns	Can explain how VAT works.	Prepares the return from your books and submits it to HMRC through Making Tax Digital once you approve it.
Deadlines	Only if you ask.	Tracks your Companies House and HMRC dates and tells you before they are due.
Explains things in plain English	Yes, very well.	Yes, and the answer is about your own numbers.

AccountsOS is on HMRC's list of MTD VAT software (opens gov.uk in a new tab). ChatGPT is a product of OpenAI and is described here as a general assistant used on its own.

Or use both

If you already live in ChatGPT or Claude, connect them to AccountsOS. Ask a question there and the answer comes from your own ledger, not a file you pasted in.

See Finn in ChatGPT or the AccountsOS connector for Claude and other AI apps.

Questions people ask

Can I use ChatGPT to do my company accounts?

You can use it to understand the rules, and it is good at that. It does not keep a ledger of your company, so it cannot produce accounts that add up across a year, and it cannot submit a VAT return to HMRC. Use it to learn, and use accounting software to keep the books.

Is Finn just ChatGPT with a different name?

No. Finn is the AI accountant inside AccountsOS. It works on your real ledger with accounting tools: it reads your bank lines, matches receipts, posts journals and prepares returns. The money maths is done by the ledger, not guessed by a language model.

Can I use both?

Yes. Finn is a ChatGPT app, so you can ask ChatGPT about your books and the answer comes from your AccountsOS ledger. The app only reads; changes happen in AccountsOS, where you can see them.

Does Finn file things without asking?

No. Finn prepares the work and you review and sign. Nothing is filed or paid without your yes.

Where do Finn's tax answers come from?

From a library of UK rules and rates checked against HMRC and GOV.UK, and from GOV.UK guidance itself. The source shows under the answer so you can read it yourself.

Try Finn on your own books

Free for 14 days, no card. Upload a bank statement and a few receipts and see the ledger Finn builds.

Meet Finn, free

ChatGPT explains the rules.Finn keeps your books.