Open tax infrastructure for builders
Add inspectable tax intelligence to your agent or application.
Inspect our source-cited skills and their review records, fetch a public bundle, or connect a compatible AI to the hosted tools. Check the licence before incorporating skill content into a product or service.
Quickstart
Browse and download skills without an account. The hosted AI connection allows limited guest use, then asks you to sign in with a free account. Some AI apps ask you to connect your account during setup.
Point an agent at the live server
Add this server URL to a compatible AI client. The tool catalogue is public; tool calls allow limited guest use, then require free sign-in.
https://www.openaccountants.com/api/mcpFetch a jurisdiction bundle (no auth)
curl https://www.openaccountants.com/api/bundle/maltaInstall rules locally with the CLI
npx openaccountants listWhat are you building?
An AI agent
Retrieve relevant tax rules and workflows during an agent task.
A bookkeeping application
Turn extracted transaction data into tax treatment, classifications and review flags.
A fintech product
Identify taxable events, obligations and questions triggered by financial activity.
An accounting workflow
Apply maintained rules inside an existing automation or practice process.
A local research tool
Install and pin open files without relying on the hosted service.
Choose how to integrate
Live server
Give compatible agents access to skills and tax tools. Limited guest use is followed by free sign-in.
Inspect before you connect.
Our software is open source under AGPL-3.0-only. The skills and their exports use the OpenAccountants Guide License: free to read and use personally, with written permission required for redistribution or inclusion in a product or service.
For platforms & enterprise
Your product already understands the transaction. We help it understand the tax treatment.
Add jurisdiction-specific rules, classifications, reporting flags and citations to bookkeeping, fintech and accounting products. Start with the data layer and route appropriate cases for professional review. Open, source-cited rules across 274+ jurisdictions — every rule shows its review status.
Bookkeeping platforms
Turn extracted invoice and bank data into proposed VAT treatment, deductibility, reporting categories and review flags.
Fintech applications
Identify potentially taxable events, likely obligations and questions triggered by payments, investments or asset movements.
Payroll products
Apply current rates, thresholds and employment-tax checks inside existing payroll processes.
AI agents
Retrieve relevant rules, workflows, citations and review metadata during an agent task.
Rule bundle
A no-auth markdown fetch of every published rule for a jurisdiction — GET /api/bundle/[jurisdiction]. Cache-friendly; inspect before you integrate.
Live server
A live server any AI agent can call for discovery, versioned retrieval, workflows and review metadata.
Structured API
A keyed REST API that returns classifications, citations and review flags for structured facts. Scoped per integration.
Professional-review handoff
Route a selected case to a suitably qualified professional. Offered where available, on agreed terms.
Show us one real workflow.
Tell us what enters your system, what tax decision is currently manual and what output your product needs. We will map the smallest useful integration before proposing a wider rollout. An integration does not itself include professional advice or filing for your users. Those services require a separate written engagement.