AI is changing how tax expertise is discovered. Build your position before the new professional layer is already established. Build a Guide →

Built in the open, by accountants, country by country

The trust layer for people using AI for tax and accounting.

Name: OpenAccountants MCP Server
Author: OpenAccountants

It guesses. Accountants around the world are making sure it stops, by writing the Guides your AI reads and putting their name on the ones they stand behind.

Add to your AI Build a Guide

Browse all Tax Guides →

What you build

Turn one job you know into a Guide with your name on it.

Describe an accounting job you do every week. Your AI drafts it into a source-cited Guide, you steer it, and it publishes under your name — then other accountants attest to it and AI puts it to work.

Rwanda Payroll

RW · Payroll

A Guide for calculating employee payroll, PAYE and social contributions in Rwanda.

Authored by Cettina Vella, CPA

1,240 uses through AI

2 accountants attest

2025 · v4 · Rwanda Income Tax Act, Art. 47

Inspect a real Guide

Illustrative example.

One Guide, and your name starts working for you.

Distribution you can’t buy
Every answer an AI builds from your Guide puts your name in front of someone who’d never have found you. Reach no ad spend buys.
A founding legacy
A permanent place in the professional layer AI now runs on, staked before the category fills up. The knowledge carries your name for good.
Standing you can prove
Named colleagues attest to your work. A public, verifiable record of expertise you can put in front of any client.
Upside as it grows
The accountants behind the Guides people rely on are first in line for what comes next: paid work, commercial terms, a stake in what they helped build.

The numbers behind the names

The Guides AI reaches for most

Every name is a real, credentialed professional. Meet the Open Accountants →

How you build one

Describe a job. The AI drafts it. You publish it.

1
Describe the job
One sentence: “Prepare a Malta VAT return for a small business.”
2
Build it with your AI
It drafts a source-cited Guide from your method; you steer and correct it.
3
Publish under your name
It goes live credited to you. Then invite accountants to attest to it.

Build a GuideNo account needed to start.

What we built

Accountant-written Tax Guides, inside the AI you already use.

Open Accountants is free to add to ChatGPT, Claude, Cursor and other AI tools. Add it once, and your AI draws its tax answers from the open Tax Library: source-cited, versioned, and showing exactly which accountant wrote each one.

Nothing to download. Add one address to the AI you already use, sign in once when it asks (free), ask it a tax question, and see the difference for yourself, before you write a single Guide.

Full install guide How it works →

Wire it into your AI in about two minutes

Pick your AI, paste the address, done in about two minutes.

Open Claude.ai Connectors

1Open Claude.ai Connectors (button above) — or Settings → Customize → Connectors.
2Click + → Add custom connector. Name it OpenAccountants and paste the URL below.
3Click Add → Allow tools when prompted. On first use, sign in with your OpenAccountants account.

https://www.openaccountants.com/api/mcp

Try it — your first prompt

Start by naming the connector, so your AI knows exactly what to use. Paste this: “Using Open Accountants, please tell me how you can help me, considering what you know about me.”

See what stands behind an answer

Your AI can give an answer. Open Accountants shows what stands behind it.

Every answer can trace back to the Tax Guide used, its authoritative sources, applicable period, current version and professional review record.

Inspect a real Tax Guide →How professional review works →

Question

“What is the UK VAT registration threshold?”

Answer using Open Accountants

£90,000

Source: HMRC
Applicable period: 2025/26
Guide version: 4
Status: Accountant-reviewed
Reviewed by: James Power

2,799: AI tax lookups this month
28: Open Accountants
182: Accountant-reviewed Guides
1,754: Open Tax Guides
241: Jurisdictions covered

Accountants hold credentials from ACCA, CPA, ICAEW, AICPA and other recognised professional bodies.

Our accountants hold credentials from

ACCA

Association of Chartered Certified Accountants

CPA

Certified Public Accountant

ICAEW

Institute of Chartered Accountants in England and Wales

AICPA

American Institute of CPAs

The network is growing now. Many jurisdictions and professional areas still have no Guide with a named accountant behind them.

Find Guides in your jurisdiction →

Coverage

The world's Tax Guides still need accountants behind them.

Do not let anonymous AI answers become the new tax authority — every Guide here shows its sources, version, and the named professional behind it.

Choose a country, state or province to see its Guides, their status, and the accountants already writing them.

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The interactive map works best on a larger screen. see coverage by country.

Explore Guides by jurisdiction →

Use Open Accountants

You do not need to join as an accountant to use it.

Ask with it

Add source-cited Tax Guides to the AI workspace you already use.

Add to your AI→

Use it in your practice

Research unfamiliar matters, inspect authoritative sources and prepare structured drafts you can publish under your name.

The Open Accountants→

Build with it

Add tax knowledge to an agent, accounting platform or financial application.

For developers→

AI is changing accounting with or without you.

You can wait until the profession's new reputation layer is already established.

Or you can begin building your position inside it now.

Write one Tax Guide in an area you already know.

Create a public record of your expertise.

Help ensure the tax knowledge AI systems rely on still has accountants behind it.

Build a Guide Browse the Tax Library →