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OpenAI / ChatGPT + AccountsOS

UK accounting actions for ChatGPT and custom GPTs

Use AccountsOS as an OpenAI Actions plugin for ChatGPT and custom GPTs. Query your books, log expenses, and check deadlines — all from within ChatGPT conversations. Coming soon with full function calling support.

Actions

Scopes

Focused

Launch

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OpenAI Actions schema

// OpenAI function calling schema
{
  "name": "get_transactions",
  "description": "Query transactions",
  "parameters": {
    "type": "object",
    "properties": {
      "from_date": { "type": "string" },
      "to_date": { "type": "string" },
      "direction": {
        "type": "string",
        "enum": ["in", "out"]
      },
      "limit": { "type": "integer" }
    }
  }
}

Available Tools

Tool	Description	Scope
`get_transactions`	Query income and expenses with date and direction filters	read
`get_balance`	Check current account balances across all accounts	read
`get_vat_summary`	Get VAT position for any quarter	read
`get_deadlines`	List upcoming filing deadlines	read
`create_transaction`	Record income or expense entries	write
`update_transaction`	Modify transaction details or categories	write
`categorize_transaction`	Get AI category suggestion for a transaction	write
`list_categories`	Browse HMRC-aligned expense and income categories	read
`create_deadline`	Add custom filing deadlines and reminders	write
`search_documents`	Find receipts, invoices, and contracts	read
`upload_document`	Store receipts and invoices with metadata	write
`get_dla_balance`	Check Director's Loan Account with S455 warnings	read
`get_invoices`	List and filter invoices by status	read

Features

OpenAI Actions API with full function calling schema

Works with ChatGPT Plus and custom GPTs

Natural language accounting queries in ChatGPT

Create and categorise transactions from conversation

VAT summaries and deadline tracking

Secure OAuth-based authentication flow

How It Works

Install the AccountsOS GPT action

Add AccountsOS as an action in your custom GPT or use our pre-built GPT from the store.

# In GPT Builder → Actions → Import URL
https://accounts-os.com/.well-known/ai-plugin.json

Authenticate with your account

Connect your AccountsOS account via OAuth. Choose read, write, or admin scope.

# OAuth flow handles authentication
# No API keys in chat — secure by default

Ask ChatGPT about your books

ChatGPT can now query your transactions, log expenses, check VAT, and more.

"What did I spend on software this month?"
"Log £120 for the annual domain renewal"
"Show me my VAT position for Q4"

Benefits

Use ChatGPT as your UK accounting assistant

Build custom accounting GPTs for your workflow

OAuth authentication — no API keys in conversations

Works with ChatGPT Plus, Teams, and Enterprise

All 13 accounting tools via function calling

Frequently Asked Questions

When will the ChatGPT integration be available?

The OpenAI Actions integration is planned for Q2 2026. In the meantime, you can use Claude Desktop with our MCP server or the REST API to build custom integrations.

Will it work with custom GPTs?

Yes. You'll be able to add AccountsOS as an action in any custom GPT, giving it full UK accounting capabilities. We'll also publish a pre-built AccountsOS GPT to the GPT Store.

How does authentication work with ChatGPT?

Authentication uses OAuth 2.0, so you connect your AccountsOS account once and ChatGPT maintains the connection. No need to paste API keys into conversations.

Can I use this with the OpenAI API directly?

Yes. The function calling schemas will be published so you can integrate AccountsOS tools into any OpenAI API application, not just ChatGPT.

Related Connections

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AI-powered accounting for your UK limited company.

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