Skip to content
Open-source books. Two markets.

Bookkeeping that stays clear. For your business or your clients.

A focused path for small businesses keeping their own books, and another for accounting bureaus managing many client books.

Get startedView the source

Open source · UK and Estonia · Your books, your control

Choose the way you keep the books.

FastAccounts serves two distinct working models. Start with the one that matches your day-to-day responsibility.

I run an accounting bureau

Manage payroll, payables and bookkeeping across separate client organisations, with a clear review trail for each book.

See bureau workflows

I run my own business books

Issue invoices, record bills, reconcile bank activity and prepare VAT workpapers for one organisation.

See small-business features

The wider FastSME suite

Each product has one job, with the same straightforward hosting choices.

FastHR

Employee records, leave and people operations.

Explore FastHR

For small businesses running their own books

Keep the everyday path focused: sell, record costs, reconcile cash and hand over reviewed records when you need professional help.

INVOICING

Sell and get paid

Country-aware invoices, credit notes, payments, reminders, and a complete receivables trail.

BANKING

Know where cash went

Import statements, match with evidence and documents, and review ambiguity before anything posts.

REPORTING

Hand over clean books

VAT workpapers, ledgers, reports, evidence, audit history, and explicit filing-agent plans.

From bank statement to reviewed returns.

A repeatable workflow for each client’s books. Explore it with synthetic data in the bureau demo.

  1. Connect the bank

    Start with statement imports. Planned: read-only open banking; no provider is connected by default.

  2. Book the documents

    Keep invoices, bills and evidence together in each client’s books.

  3. Reconcile

    Review suggested matches and supporting evidence before confirming a posting.

  4. Prepare the returns

    Available: VAT workpapers and export. Planned: direct tax submission.

Less spreadsheet work. More clarity.

The old way

  • Invoices and evidence scattered across files.
  • Payment matches explained in a separate spreadsheet.
  • Client books spread across disconnected folders.
  • VAT figures copied into another workbook.

The FastAccounts way

  • Invoices, bills and evidence in one workspace.
  • Review payment matches alongside their evidence.
  • Separate client books with a shared overview.
  • VAT workpapers to review before export.

For accounting bureaus

Give every client your full attention. Keep their books and payroll together in one organised workspace.

Open your workspace
All your client books

Switch between client companies in one workspace, with separate books and a clear overview for each.

Monthly payroll for review

Create a payroll draft for each client organisation in one click, then review and approve payslips and ledger postings.

Matches you can explain

See why a bank transaction matches a document, review the evidence, and confirm before posting.

Review before export

Available: Estonian VAT (KMD) and UK VAT workpapers and export. Review the figures before export. Planned: direct filing.

Pricing

Simple pricing for every FastSME product.

Every Fast* product uses the same two options: bring your own cloud for free, or host with us for €1 per month.

BYOC

Bring Your Own Cloud

Free

Self-host on your own infrastructure or cloud. Full control of data and upgrades. No per-seat platform fee.

Hosted

Host with us

€1 / month

We run the product for you on FastSME-managed infrastructure. €1 per product per month.

Interface languages
4
Bookkeeping markets
UK + Estonia
BYOC
Free
Hosted
€1 / month
Good to know

Your questions, answered.

What is FastAccounts?

FastAccounts is open-source bookkeeping software for UK and Estonian small businesses and accounting bureaus. It brings invoices, bills, banking, ledgers and VAT workpapers into one workspace.

What is the difference between BYOC and hosted?

Bring Your Own Cloud (BYOC) is free: you run FastAccounts on your own infrastructure and manage updates. Hosting with us costs €1 per product per month on FastSME-managed infrastructure.

Which countries are supported?

Available: UK and Estonian bookkeeping plus VAT workpapers and export. Review required: Estonian payroll for accounting bureaus awaits production UAT. Planned: direct tax submission.

Can I inspect the code and self-host?

Yes. FastAccounts is available on GitHub under the MIT license. You can use, modify and self-host it under that license, retaining its copyright and permission notice.

Which integrations are available?

Available: employee file import and FastHR. Review required: QuickBooks Online, Xero, Merit Aktiva, BambooHR and Personio. Pilot: HMRC workpapers and Estonian KMD/VD export. Planned: direct tax filing, open banking and the remaining catalogue. No provider is connected by default.

Give every client's books a clear home.

Start with your workspace, or explore the source and host FastAccounts yourself.

Get startedView the source