Demo (edited test demonstration, pauses shortened): https://terminaltax.github.io/terminal-tax-mcp-server/demo/
Let ChatGPT or Claude file your taxes directly with the IRS. Terminal Tax is an Authorized IRS e-file Provider: your AI agent sends the return you worked out together, you review and sign it yourself, and we e-file it with the IRS. Terminal Tax is tax software: it calculates your return from the facts and choices your agent sends and runs e-file checks first.
I built Terminal Tax (terminal.tax) to be that last step. It's a hosted MCP server at https://mcp.terminal.tax/v1/hosted-mcp. No API key or install, so any agent that can make a web request can call it.
The agent sends the person's tax numbers. We calculate and check the return and send back one private link. The person opens it, reviews the return, and signs it themselves, and then we e-file it. Their SSN and signing PIN go on that page, never in the chat.
The exact requests are at https://terminal.tax/llms.txt.
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