0s and 1s CIS MCP

An official MCP server providing UK Construction Industry Scheme (CIS) calculation tools, including deduction calculators, penalty estimators, and gross payment status checks, allowing AI assistants to perform compliant tax computations without storing data or requiring authentication.

Endpoint and access

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

No sign-inEndpoint checked 2026-10-18Operated by 0s and 1s

MCP endpoint (Streamable HTTP)

https://0sand1s.co.uk/mcp

Vendor documentation

What you can do with it

Calculate CIS deductions from gross payment amounts
Estimate late filing penalties for CIS returns
Check subcontractor gross payment status turnover tests
Verify if a nil return is due for a tax period

Tools advertised by the last live check:

cis_deduction
cis_gross_up
cis_tax_month
cis_late_penalties
cis_gross_payment_turnover_test
cis_needs_verification
cis_nil_return_check

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 0s-and-1s-cis-mcp https://0sand1s.co.uk/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 0s-and-1s-cis-mcp --url https://0sand1s.co.uk/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable 0s-and-1s-cis-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "0s-and-1s-cis-mcp": {
      "url": "https://0sand1s.co.uk/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": {
    "0s-and-1s-cis-mcp": {
      "type": "streamableHttp",
      "url": "https://0sand1s.co.uk/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start 0s-and-1s-cis-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "0s-and-1s-cis-mcp": {
      "type": "http",
      "url": "https://0sand1s.co.uk/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 0s-and-1s-cis-mcp https://0sand1s.co.uk/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": {
    "0s-and-1s-cis-mcp": {
      "url": "https://0sand1s.co.uk/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": {
    "0s-and-1s-cis-mcp": {
      "serverUrl": "https://0sand1s.co.uk/mcp"
    }
  }
}

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