Everything Finn Does for Your Business

Issue, send, track and get paid — without lifting a finger after the first invoice.

Subscriptions, retainers, monthly billings — set once, forget forever.

Quote in 60 seconds. Convert to an invoice in one click.

Snap, forward, drop, dictate — receipts reach your books from 9 different channels.

Drop a CSV or PDF from any UK bank — we read it. No template setup.

Out-of-pocket spend captured, approved, paid back. HMRC mileage and home office calculated for you.

Wherever you message, you can do accounting.

Your bank feed teaches itself. The same payee never gets manually categorised twice.

Every document. Searchable. Linked. Stored for 6 years.

HMRC mileage at the right rate, automatically.

The £10/week HMRC flat-rate, calculated and posted automatically.

Forward to documents@accounts-os.com — receipts, invoices, statements all flow in.

Talk to your books. Ask anything. The AI does the work.

Hands-free accounting. Drive, walk, cook — talk to your books.

Your books inside the AI assistant you already use.

Every transaction labelled with the right UK GAAP category, automatically.

The AI remembers every conversation, decision, and pattern across sessions.

P&L, Balance Sheet, Trial Balance, Cash Flow Forecast — instant, accurate, exportable.

Project cash 12 weeks and 12 months ahead — from your real recurring patterns.

Real accounting under the hood — not a single-entry shortcut.

Every GL account, debits and credits, period-by-period.

Send your accountant exactly what they need — in Excel.

VAT 9-box always live. File when you're ready.

See your CT bill in real time. Generate the workpaper for filing.

Never miss a filing again — even ones you didn't know about.

Take the most home, legally. We do the maths every payroll cycle.

The AI spots savings you'd miss. You get nudged in time to act.

Enter your company number once. We sync everything daily.

Digital records, digital links, digital submissions — by default.

One place for every HMRC interaction.

Director self-assessment ready, with dividends and salary already tallied.

Run payroll, send payslips, file RTI. No payroll bureau needed.

Declare, document, pay — compliantly.

Stay out of the S455 trap. The DLA stays in the green or you hear about it.

Every supplier, customer, contractor — in one searchable list, linked to every transaction.

Track work from pitch to paid.

Set targets. Watch them in real time. Get nudged when off-track.

Know what you owe, when, to whom. Pay without a spreadsheet.

Find anything. Transactions, contacts, invoices, documents — one keystroke.

160+ UK-relevant templates, AI-clause review and drafting, e-signature.

UK-deep. International-aware. Run a Ltd, an LLC and a free-zone company side-by-side.

Trade in 40+ currencies. Books stay in your base currency. FX locked at date.

Run multiple businesses without paying for multiple accounting subscriptions.

Built so accounting practices can run client books too.

Every change. Every actor. Every time.

Enterprise-grade security for a startup-grade subscription.