Duck Tax MCP MCP server

An MCP server that allows AI agents to validate micro-entity company accounts, derive balance sheets, look up company records on public registers, calculate late filing penalties, and categorize bank statements. It provides checked figures for directors and accountants without filing anything directly.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Duck Tax

MCP endpoint (Streamable HTTP)

https://ducktax.com/api/mcp

Vendor documentation

What you can do with it

Validate seven figures and get the balance sheet back
Pull the register record, officers and the real deadline
Lift last year's comparatives off the last filing
Sort a year of transactions into the seven figures

Tools advertised by the last live check:

check_accounts
dormant_figures
totals_to_figures
late_filing_penalty
list_jurisdictions
sample_accounts
lookup_company
search_companies
get_prior_year_figures
explain_accounts
categorise_transactions
check_filing_extension
draft_extension_reason
list_saved_filings
save_filing
delete_filing
track_company_deadlines
list_tracked_companies
untrack_company_deadlines
server_status

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http duck-tax-mcp https://ducktax.com/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add duck-tax-mcp --url https://ducktax.com/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable duck-tax-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "duck-tax-mcp": {
      "url": "https://ducktax.com/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "duck-tax-mcp": {
      "type": "streamableHttp",
      "url": "https://ducktax.com/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start duck-tax-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "duck-tax-mcp": {
      "type": "http",
      "url": "https://ducktax.com/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http duck-tax-mcp https://ducktax.com/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "duck-tax-mcp": {
      "url": "https://ducktax.com/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "duck-tax-mcp": {
      "serverUrl": "https://ducktax.com/api/mcp"
    }
  }
}

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