AI is changing how tax expertise is discovered. Build your position before the new professional layer is already established. Build a Guide →
A free tax plugin for ChatGPT, Claude, Gemini and Cursor
The AI you use does not know how tax is done. Accountants wrote it down.
Ask it to take you through a return step by step, or when something is due, or how a rule applies to you, and it answers with the same confidence either way. Open Accountants gives it 1,790 accountant-written Guides to follow first: the same steps a professional would take, in the order they take them, across 244 jurisdictions.
26% of taxpayers used AI on their return this year. Last year it was 11%. Adobe polling, via CBS News
Free · nothing to download · about two minutes
- 5,580
- Questions answered
- 36
- Countries with accountants building Guides
- 394
- People signed up
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The only question that matters
What do you trust more?
An AI working it out
It infers a method, in whatever order seems plausible, from training data of unknown vintage. No source, no date, nobody to ask.
An AI following an accountant's method
Written by a licensed professional in your country with years behind it, their name on it, each figure citing its source and the date it was last checked.
It makes no difference whether you run a business or run a practice. The principle is the same either way: a professional in your jurisdiction wrote down how this is done, and you can see who.
Where an accountant has reviewed a Guide, their name is on it. Everything else is labelled a source-cited draft and never dressed up as reviewed, so you always know which one you are reading.
The difference, row by row
An AI on its own
With Open Accountants
Does it know the steps, and the order?
It improvises a sequence, in whatever order seems plausible.
It follows the steps an accountant wrote down, in the order they take them.
Where did the number come from?
Training data. You cannot see when it was learned or from what.
A named source, cited on the Guide, with the date it was last checked.
Who stands behind it?
Nobody.
A licensed accountant who put their name on it, and can be looked up.
What happens when there is no good answer?
You still get one, delivered with exactly the same confidence.
It tells you nothing reliable was found, and we log the gap.
Can you check the answer yourself?
Not really. You can ask again and get a different answer.
Yes. Open the Guide, read the source, see who reviewed it and when.
What about outside the US?
Thinner the further you get from US federal rules.
244 jurisdictions, including states and provinces.
Free. Nothing to download. About two minutes.
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 the AI you use 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.
Wire it into your AI in about two minutes
Pick the AI you use, paste the address, done in 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 Open Accountants, please tell me how you can help me, considering what you know about me.”
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 · PayrollA Guide for calculating employee payroll, PAYE and social contributions in Rwanda.
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.
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.
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
Accountants 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 Guide with a named accountant behind them.
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.
The interactive map works best on a larger screen. see coverage by country.
Use Open Accountants
You do not need to join as an accountant to use it.
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.