ac-co.ai
HMRC-recognisedSign inStart a return
PRICING

One flat fee — only when you file.

Launch offer — 50% off your first return. No subscription, no per-page charge — and filing from your chat costs nothing extra. Draft the whole thing for free; pay when you're ready to submit.

Simple
PAYE + one extra income
£29£59/ return
50% off until 14 January 2027

For one supplementary page — a side hustle, some dividends, or a single rental.

Start a return
  • ✓SA100 + one supplementary page
  • ✓HMRC pre-pop reconciled
  • ✓Full tax computation
  • ✓File from the app or your chat
  • ✓Receipt stored 6 years
Complete
Most self-employed & landlords
Most picked
£65£129/ return
50% off until 14 January 2027

Every income type, every supplementary page, capital gains and reliefs — drafted and filed.

Start a return
  • ✓Everything in Simple, plus:
  • ✓Unlimited supplementary pages
  • ✓Capital gains (SA108) — shares & crypto
  • ✓Section 24 + pension optimiser
  • ✓Payments-on-account planning
  • ✓Priority human review add-on
Accountant
Firms & multi-client
Custom

For practices filing at volume. Bulk import, multi-client console, white-label and review queue.

Talk to us
  • ✓Multi-client console
  • ✓Bulk client import
  • ✓Review & approve queue
  • ✓Agent services account
  • ✓API + bordereau export
TRUST

We file in your name, so we hold ourselves to the highest bar.

ac-co is HMRC-recognised software submitting through the official API. Connections to your bank and books are read-only. Every figure traces to a source, and every receipt is stored for six years.

HMRC
recognised software
Companies House
joint filing
Open Banking
read-only access
UK GDPR
data resident in London
Human-in-loop
you approve every submission
Records kept
6 years, automatic
FAQ

Questions people actually ask.

An AI back office for UK business. It keeps your books clean automatically, then prepares and files every UK tax return — VAT, Self Assessment, Corporation Tax, MTD income tax and payroll — and adds grounded legal AI. One connection feeds all of it.

No. Start with clean books, or just the single filing you need. Each product works on its own and unlocks the next, because everything shares the same numbers.

Yes. ac-co files through the official HMRC and Companies House APIs as recognised software. You review every figure and tap submit — nothing is filed without you.

In the UK. Bank and accounting connections are read-only, every figure traces back to a source, and records are kept for six years.

Yes. The Advisor plan runs multiple clients from one dashboard, adds ac-co.legal, and lets you drive filing from ChatGPT, Claude or Codex.

ac-co.legal is grounded in your own documents — every answer cites the clause it came from, and edits land as real tracked changes, in the web app or inside Microsoft Word.

GET STARTED

Your whole back office, on autopilot.

Connect once and let ac-co keep the books, file the tax, run the payroll and ground your legal work — with you in control of every submission.

Free to start · no card · cancel anytime
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