AI is changing how tax expertise is discovered. Build your position before the new professional layer is already established. Review a Guide →
Built in the open, by accountants, country by country
The trust layer for people using AI for tax and accounting.
It guesses. Accountants around the world are making sure it stops, by reviewing the Guides your AI reads and signing the ones they stand behind.
Start now — pick your jurisdiction
Michael
Founder
James
🇬🇧 United Kingdom
Miguel
🇩🇴 Dominican Republic
Mayur
🇮🇳 India
Edgar
🇨🇦 Canada
Spain
Needs review →
Lal
🇱🇰 Sri Lanka
Mehran
🇸🇦 Saudi Arabia
Ariane
🇧🇷 Brazil
Ibrar
🇵🇰 Pakistan
Australia
Needs review →
Mário
🇵🇹 Portugal
Rilia
🇮🇩 Indonesia
Ashish
🇳🇵 Nepal
Baraka
🇹🇿 Tanzania
France
Needs review →
Christos
🇨🇾 Cyprus
Jose
🇻🇪 Venezuela
Rob
🇺🇸 Florida
James
🇺🇸 US Federal
Maria
🇵🇪 Peru
Werner
🇿🇦 South Africa
Gvantsa
🇬🇪 Georgia
Omolola
🇳🇬 Nigeria
Yeong
🇰🇷 South Korea
What you get for reviewing
One Guide review builds your position. Here's what it earns you.
Your name on the record
Every Guide you review carries your name and credentials, visible to everyone (and every AI) that relies on it.
A founding professional record
An attributable AI-era history, started before the category gets crowded.
Discoverability
Your profile is linked from every Guide and review record connected to you.
Paid opportunities
Selected Guide reviews and maintenance assignments can carry paid bounties or separate commercial terms.
Future participation: active Partners may become eligible for future professional, commercial and economic programmes as Open Accountants grows.
What we built
A connector that puts reviewed Tax Guides inside the AI you already use.
Open Accountants is a free connector for 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 reviewed what.
Nothing to download, no account needed. Paste one address into your AI's connector settings, ask it a tax question, and see the difference for yourself — before you review a single Guide.
Wire it into your AI in about two minutes
Pick your AI, paste the address, done — about two minutes.
- 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/mcpTry it — your first prompt
Start by naming the connector, so your AI knows exactly what to use. Paste this: “Using the Open Accountants connector, please tell me how you can help me with my taxes.”
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.
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
- 2,328
- AI tax lookups this month
- 27
- Open Accountants Partners
- 182
- Accountant-reviewed Guides
- 1,752
- Open Tax Guides
- 241
- Jurisdictions covered
Partners hold credentials from ACCA, CPA, ICAEW, AICPA and other recognised professional bodies.
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 current Partner review coverage.
Coverage
The world's Tax Guides still need professional review.
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 review status, and the Partners already contributing.
The interactive map works best on a larger screen — see coverage by country.
Use Open Accountants
You do not need to become a Partner to use it.
Use it in your practice
Research unfamiliar matters, inspect authoritative sources and prepare structured drafts for professional review.
For 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.
Review one complete 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.