Open tax infrastructure for builders
Add inspectable tax intelligence to your agent or application.
Use open tax rules and source metadata without researching and maintaining every jurisdiction yourself. Reads are public — inspect the files, fetch a bundle or point an agent at the live server without signing up.
Quickstart
Pick the path that fits and you have working tax data in a minute. The bundle, GitHub and CLI need no account; the live server asks for a free sign-in on first use.
Point an agent at the live server
Add this server URL to any compatible AI client. Discovery and retrieval are public; only contribution tools require 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 search "VAT registration"What 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 live access to discovery, retrieval and workflow tools — reads need no auth.
Inspect before you connect.
Every public rule is readable on OpenAccountants and linked to its exact source file on GitHub. No developer should need to connect a server merely to see what knowledge it contains.
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 242+ 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. OpenAccountants does not sign or file on your users' behalf; professional engagements are agreed separately.