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The Symmetry Tax Engine Model Context Protocol (MCP) server gives you direct access to STE’s payroll tax calculation engine through plain English, inside the AI tools you already use. No code. No developer ticket. No payload to assemble. Supported clients: Claude Desktop, Claude Code, Cursor, ChatGPT (paid plans only), or other AI-enabled IDEs
ChatGPT is supported on paid plans only, alongside MCP clients like Claude Desktop, Claude Code, and Cursor.

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Who is this for?

  • Tax and compliance analysts: validating jurisdiction rules and rate changes before they go to production
  • Customer support reps: answering “why did my paycheck calculate this way?” without waiting on engineering
  • Implementation and onboarding teams: running parallel-payroll sanity checks during cutover
  • Payroll operations leads: verifying that an address maps to the correct locals
  • Product managers: prototyping a new wage-type, benefit, or election before writing a ticket

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Get started

Install & connect

Add and connect the STE MCP server in Claude Desktop, Claude Code, or Cursor.

Claude Desktop walkthrough

Watch a short demo of connecting Claude Desktop and verifying the connection.

Troubleshooting

Fix connection failures, redirect errors, missing tools, expired tokens, and 403s.

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What you can ask

Twenty-four tools sit behind the server, covering payroll tax calculation and gross-up, rate history, wage bases, bracket schedules, benefit taxability, and jurisdiction lookup. You never need to call them by name. Describe what you need in plain English and your assistant picks the right one.
Calculate semi-monthly payroll taxes for a $3,000 regular wage in Pittsburgh, PA. Single, no dependents.
How has the federal Social Security rate moved over time?
PSD code 450106 came in on a client file. What place is that, and which taxes sit behind it?

Tools

The full catalogue of what the STE MCP server can reach.

Sample prompts

Prompts by role, ready to copy into your AI assistant.