“You run the business. I’ll run the books.”
Hi, I’m Finn.Your AI accountant.
Snap a receipt or forward me an email and I’ll book it. Then I file your VAT to HMRC, run payroll, close month-end, and submit your annual accounts. The whole accounting job, done, for $24/month.
AccountsOS is AI accounting software for founders, sole traders and small businesses, live in 21 countries. Plain-English accounting that runs itself, from $24/month.
Free for 14 days, then $24/month · No card required
I’m on every channel. Talk to me however you like.
I don’t stop at bookkeeping. One receipt in, filed accounts out:
One Finn. However you talk to her.
- Built secure
- Two-factor authentication
- Bank-level encryption
- Read-only bank access
- Row-level data isolation
- AI never trains on your data
Built for you
Whatever you run, Finn runs the books.
Just starting out
Your first year, handled. We set the company up and file your first tax return.
Sole trader & freelancer
Snap receipts, track expenses, file Self Assessment. No spreadsheets.
Contractor
Inside or outside IR35. Your books, VAT and tax, sorted in seconds.
Limited company
Companies House, VAT, Corporation Tax and annual accounts, on autopilot.
Established business
Payroll, invoicing, month-end and reporting, all in one place.
Accountants & practices
Run your whole client book on Finn. Practice mode built in.
See it in action
Meet Finn, your AI accountant.
Ninety seconds: receipts captured, questions answered, invoices chased, month-end closed, and VAT filed straight to HMRC, all in the background.
The shift
AI-native, not AI-bolted-on.
Every other accounting tool is a 2010-era ledger with a chat box stapled to the side. AccountsOS was built the other way around: AI first, every screen second.
The old way
- £100-300/month accountant who responds in 2 days.
- £20-35/month software that needs a 6-hour onboarding call.
- You enter every transaction. You categorise every receipt.
- One country, one currency. One entity at a time.
- Tax advice arrives a month after you needed it.
With Finn
- An AI accountant that answers in 4 seconds, 24/7.
- One sign-up, no setup call, no training. Talk to it.
- Forward an email. Drop a CSV. Snap a receipt. Done.
- 21 countries today, multiple entities under one login.
- Tax savings flagged the moment they appear.
It runs for you
You feed it. Finn runs the books.
Not a dashboard you fill in. An accountant that works in the background. Send receipts and statements, and Finn reconciles, closes your month, and prepares your accounts on its own. It only asks when something is genuinely missing.
Send it, any way you like
Receipts, invoices, statements, Telegram, Slack, email forwarding. Whatever’s easiest.
Finn
takes it from here
Finn handles the rest, automatically
Capabilities
What Finn actually does for your business.
Bookkeeping
Your books just happen.
Forward a receipt, drop a bank statement, or snap a photo. Finn reads it, files it in the right category, matches it against your bank and open invoices, and keeps proper accountant-grade books underneath. The same vendor never needs explaining twice. You review the odd exception, not every line.
Tax & compliance
Tax, handled before it's due.
Finn tracks every deadline from Companies House, calculates your VAT and Corporation Tax as you go, and files VAT straight to HMRC. It flags savings while you can still act on them: claimable expenses, the right salary and dividend split, an overdrawn director's loan before it costs you.
Cash flow
Money in, money out.
Send branded invoices in any currency. Set them to recur with escalating auto-chasers that go out without you touching them. Issue credit notes, convert estimates to invoices, track what every client owes. Track bills and what you owe, run payroll with the right deductions, and handle expense claims with approvals and one batched payout.
Reporting
Know your numbers, without a spreadsheet.
Profit and loss, balance sheet, VAT summary and cash-flow forecast, live from your ledger. Each month Finn tells you what changed and why: which categories moved, which clients paid late, where costs crept up. No digging through transactions yourself.
AI-native
Finn works the way you do.
Chat, talk, or forward an email. Finn doesn't just answer — it acts. Ask it to create the invoice, file the VAT return, or split a transaction, and it does it (with your approval). Works in your browser, by voice in 100+ languages, on WhatsApp, Slack, Telegram, and inside Claude Desktop and ChatGPT over MCP. Finn remembers your business across every session.
Why Finn
Three things no other accounting tool can say.
Finn executes, not just narrates.
Most AI tools talk. Finn creates the invoice, files the VAT return, chases the late payer, spots the S455 trap before year-end, and tells you what changed this month before you ask. Every action needs your approval — then it actually happens. A colleague, not a chatbot.
Your books, inside Claude and ChatGPT.
Ask about your numbers from Claude Desktop or ChatGPT over MCP, not just our app. Almost no other accounting platform lets you do this.
21 countries. 21 real tax engines.
CT600 and VAT MTD to HMRC in the UK. 12.5% corporation tax and Revenue in Ireland. Free zones and FTA in the UAE. 10% flat rate in Bulgaria. Each country has its own deadlines, rules and registry connections — not a generic translation layer.
Real activity on AccountsOS today
One tool, not a stack
Finn runs your books — and everything that feeds them.
Your contacts, sales pipeline, quotes, contracts, invoicing and chasing live in the same place as your accounts. One tool, £20 a month, instead of £100+ of apps that don't talk to each other.
Multi-country
Your books, in every country you operate.
Live in 21 countries across 4 continents. Each one with its own tax engine, registry sync, and currency — not a generic translation.
Everything included
One platform. One price. The whole finance stack.
75+ features, no add-ons, no per-seat fees. A sample of what is in the box:
AI & assistant
- Finn on every page
- Voice that acts
- Document intelligence
- Long-term memory
- Proactive insights
- Month-end close
Bookkeeping & banking
- Any-bank CSV/PDF import
- Auto-categorisation
- Bank rules
- Reconciliation
- Double-entry ledger
Tax & filing
- VAT MTD to HMRC
- Corporation Tax + marginal relief
- Annual accounts wizard
- Deadline reminders
- Self assessment
Invoicing & money
- Multi-currency invoices
- Recurring + auto-chasers
- Bills & payments
- Estimates & quotes
- Dividends & vouchers
Payroll & expenses
- Payroll with RTI
- Expense claims
- Approval workflow
- Mileage & home office
- Batched reimbursement
Reports
- Profit & loss
- Balance sheet
- VAT summary
- Cash-flow forecast
- Trial balance
Integrations
- Claude Desktop & ChatGPT
- WhatsApp, Slack, Telegram
- Companies House
- Plaid, Stripe, Wise, Mercury
- Deel
Security
- Two-factor auth
- Bank-level encryption
- Row-level isolation
- Audit trail
- AI never trains on your data
A CFO for $24/month.
Founders typically spend hundreds a month on accountant + bookkeeping software + receipt scanning + payroll + invoicing. Finn replaces all of it.
| What you're replacing | Typical cost |
|---|---|
| Accountant | £100-300/month |
| Bookkeeping software | £20-35/month |
| Receipt scanning | £15-30/month |
| Payroll software | £10-20/month |
| Invoicing tool | £10-20/month |
| Traditional total | £155-405/month |
| AccountsOS | Free* |
*Free for 14 days — then just $24/month
Everything included. No credit card to start. Cancel anytime.