For accounting professionals, individuals and businesses
Add OpenAccountants to the AI you already use.
No account needed. Pick the AI you use, paste one URL, and ask your tax questions with source-cited Tax Guides in context. Every Guide shows its jurisdiction, tax year, sources and review status.
Install
Wire it into your AI in about two minutes
Pick the AI you use and add OpenAccountants below. No account needed. Most people are 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.”
No account needed to add it. Create a free account to save your setup, keep track of the Guides you use, and get an email when accountants review new jurisdictions.
On a phone, or not ready to install? Email me the setup guide
A desktop AI app is needed to add OpenAccountants. It can't be set up from a phone browser. Leave your email and we'll send the setup guide, plus the occasional update as accountants review new jurisdictions. No spam.
Who it's for
I work in accounting
Research an unfamiliar jurisdiction in seconds, draft a cited working paper from a client's facts, and answer questions with the primary source attached. It does the grunt work; you keep the judgement and the sign-off.
I have a tax question
Understand the likely rules, see the sources, and organise the facts your accountant will need.
I am building an agent
Use the server's discovery, retrieval and tools programmatically.
“Prep the 2025 return for my client: freelance dev in California, $142k Stripe revenue, single-member LLC, home office.”
Your AI guesses Schedule C, SE tax, QBI, and state forms from training data. No current source retrieval, no citations, thresholds drift year to year.
“Prep the 2025 return for my client: freelance dev in California, $142k Stripe revenue, single-member LLC, home office.”
Loads the relevant California Tax Guides, shows its working with figures cited to source, flags edge cases, and delivers a draft review-ready working paper with statute citations — for a professional to review.
Watch it run
One prompt. Open Tax Guides. A source-cited answer out.
Describe the facts once. Your AI loads the relevant Tax Guides, shows its working with every figure cited to its source, and produces a draft working paper. Any output remains a draft unless a qualified professional separately reviews your specific facts.
Someone's AI session
- TaxpayerI rent out an apartment in Malta and made about €14,000 last year. How much tax do I owe, and how do I declare it?
- AI agentChecking the Malta rental income Tax Guide via OpenAccountants — accountant-reviewed. Two routes: a 15% final tax on gross rent, or normal progressive rates after allowable expenses. On €14,000 gross, the flat route is roughly €2,100, declared on Form TA24 by 30 April.
- TaxpayerWhich one is better for me?
- AI agentThat depends on your other income and your real expenses, so check those before you file. This Malta Guide was written by a named accountant and traces every figure to the Income Tax Act (Art. 31D) — want me to show the sources?
This answer draws on the Malta rental Guide, written by Cettina Vella · CPA (Malta)
Illustrative concept using real accountant-reviewed Malta Guides — not a customer record, not tax advice.
What stands behind this answer
Malta rental income · Tax Guide
MT · Rental- Source
- Income Tax Act, Art. 31D
- Form
- TA24 · due 30 Apr
- Applicable period
- TY 2025
- Guide version
- 4
- Status
- Accountant-reviewed
Every material figure traces back to the Guide and the primary source it came from.
Written by a named accountant
The Guide behind this answer was written by Cettina Vella, CPA (Malta), and shown with its sources. The AI cites people who stand behind the work — it never signs off itself.
General reference, not advice on your specific return — have a qualified professional review anything you plan to file.
Where it saves you time
Three moments in a busy practice
This is not a chatbot upgrade. It is source-cited Tax Guides, cited output — each showing its review status — wired into the AI you already use for client work.
Client intake
Describe messy facts once. Your AI agent loads the right jurisdiction Guides instead of you pasting statute excerpts into every session.
Unfamiliar jurisdictions
Cross-border or new-country questions without opening five government sites. Compare rules and plan positions in one session.
Review before you act
Every figure should trace to the Guide and source it used, with its review status. You review the draft working paper and determine what professional steps are required.
What the connector unlocks · Developer reference
Four tools your AI agent can call
Install once. Your AI agent pulls open, source-cited Tax Guides, runs workflows, and returns cited output with its review status — instead of improvising from training data.
Source-cited Tax Guides
Search and load published Tax Guides for any jurisdiction — income tax, VAT, payroll, corporate. Each Guide cites its source and shows whether it's a source-cited draft or accountant-reviewed.
list_skills · search_skills · get_skill
Guided workflows
Multi-step workflows for sole traders, freelancers, and corporate returns. The connector routes your prompt to the right sequence automatically.
start
Rates & thresholds
Current brackets, VAT thresholds, payroll rates, and filing deadlines — without leaving your AI session to hunt government sites.
get_rates
Cited working papers
Computation output structured for your review. Every line should trace to the Guide and source it came from, with its review status shown.
compare_jurisdictions · plan_cross_border
Why add it if the Guides are open?
Inspect everything. Add it when it helps.
The open files let you read, download and inspect individual Tax Guides. Added to your AI, OpenAccountants searches all the Tax Guides, selects the relevant material and retrieves the current published version during the conversation.
1,752
Open Tax Guides
241+
Jurisdictions covered