File your taxes from your chat.
Add the ac-co MCP server to ChatGPT, Claude or Codex and ask in plain English — "prepare my Self Assessment", "file our Q4 VAT return" — and it prepares the filing through the same HMRC channels the ac-co app uses: Self Assessment, VAT, MTD Income Tax and Corporation Tax. Nothing reaches HMRC until you review the numbers and tap file yourself.
From connected to filed, in four moves.
Everything this plan files, keeps and tells you.
Files for you
Nothing without your go-ahead — the assistant prepares, you file.
- Your returns, on your tapSelf Assessment, VAT, MTD Income Tax and CT600 — each filed only after you confirm the exact figures.
Keeps for you
A scoped connection, and a log of every call made through it.
- A scoped, revocable connectionRead-only until you grant a separate, time-boxed filing scope per action.
- A log of every callWhat the assistant asked for, and what ac-co returned.
Tells you
An answer read off your ledger, not guessed.
- An answer grounded in your ledgerNot a guess — the same computations behind the rest of ac-co, surfaced over MCP.
Prepare first. Filing costs what it costs in the app.
Connect and prepare in ChatGPT, Claude or Codex for nothing. When you file, you pay the standard ac-co price for that filing — no extra charge for doing it from a chat.
On a monthly plan, the filings your plan includes stay included — filing them from a chat changes nothing. Work that is metered in the app, such as reading a document, is billed the same way here. See all plans →
Ready when you are.
Can it change my data?
Not without you. Every tool is read-only until you grant a separate, time-boxed scope for a specific filing action, and nothing reaches HMRC or your bank without an explicit tap in the rendered app.
Who sees my figures?
Only the assistant client you've connected, and only what a tool call returns for the question asked — your bank and HMRC credentials never leave ac-co's own servers.
Which hosts work?
ChatGPT, Claude and Codex today, plus any other MCP-capable client such as Cursor — support grows as more assistants adopt the open protocol.
What does it cost?
Connecting and preparing aren't charged. When you file, you pay the standard ac-co price for that filing — exactly what it costs in the app, with nothing added for using ChatGPT, Claude or Codex. Metered work, such as reading a document, is billed as it is in the app.
Can I revoke it?
Yes, at any time, from your ac-co account settings — revoking ends that client's access immediately, and nothing it already filed is undone by revoking the connection.
Bring filing into your chat.
Connect and prepare first. Filing at standard ac-co prices — no extra charge for the chat.