Connect taxmcp.io to ChatGPT once, then ask any tax question in any chat. Answers come back grounded in the IRC, Treasury Regs, IRS Publications, and Revenue Rulings, with section numbers you can verify.
The Difference
QBI deduction rules for SSTBs?
SSTBs are phased out above the threshold amounts under §199A(d)(4)(C)...
§199A(d)(4)(C) doesn't exist. §199A(d) only has paragraphs (1)–(3). Plausible-sounding subsection, fabricated.
QBI deduction rules for SSTBs?
A specified service trade or business is defined in §199A(d)(2). For SSTBs above the threshold, the phase-in and full disallowance mechanics live in §199A(d)(3), with the threshold amount itself defined in §199A(e)(2).
Setup
Create a free taxmcp.io account. You'll get a personal MCP connection URL.
In ChatGPT, add the connection URL as an MCP server. Save and reload.
Tax questions in any future chat come back with real, cited sources.
FAQ
No. ChatGPT decides per question. Tax-flavored prompts route through taxmcp.io's tools; unrelated chats ignore the connector entirely. There's no slowdown or token cost on the conversations that don't need it.
It's an MCP server, which is the current standard for giving ChatGPT structured access to outside tools and data. Unlike a custom GPT, you don't have to start a new conversation in a particular workspace. taxmcp.io is available in any chat once it's connected.
For tax questions routed through taxmcp.io, no. The section numbers, regulation text, and ruling references come back from the indexed primary sources, not the model's memory. ChatGPT still writes the prose, but the citations are real and verifiable.
MCP / connector support is rolling out by plan and region. If you don't see it in your ChatGPT settings yet, the same taxmcp.io server works in Claude (Desktop and Web), Cursor, and any other MCP-compatible client today.
Free to start. Connect once. Every future tax question comes back grounded.
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