AI tax research for Claude & ChatGPT
TaxMCP connects Claude and ChatGPT to the tax code, regulations, IRS guidance, and Tax Court, with links you can verify.
What are the requirements for the home office deduction?
Under §280A, a home office deduction requires the space to be used:
What about the simplified method?
Works inside the AI tools you already use
Accuracy Benchmark
We asked the same AI the same federal tax questions twice: once alone, once connected to TaxMCP. Each answer was graded against the controlling sources.1
on recent-law questions1
a failing 4.8 without TaxMCP
free of critical errors1
1 in 3 carried one without TaxMCP
exact figures & dates correct1
vs 89.6% without TaxMCP
overall accuracy grade1
up from 7.4 without TaxMCP
Right or tied on 93% of questions1.
Three real benchmark questions, graded 0–10. Average lift across the full set: +2.43.
EBIT or EBITDA basis for the interest limitation after OBBBA?
“EBIT basis. The EBITDA add-back only applied before 2022.”
“EBITDA basis, permanent. OBBBA §70303(a) struck the 2022 cutoff.”
What is the 2026 Form 1099 reporting threshold?
“$1,000 for 2026,” then “corrected” itself to the same wrong number.
“$2,000, raised by OBBBA §70433(a).”
What bonus depreciation rate applies to equipment acquired in mid-2025?
“40% bonus for 2025. Pending legislation could restore 100%.”
“100%, permanent. OBBBA §70301; Notice 2026-11.”
1 TaxMCP-run benchmark across a stratified set of U.S. federal tax questions (single run), each answered by the same model with and without TaxMCP and graded against primary authority. Mean grader score 0–10; ranges are standard error across questions. Read the methodology, definitions, and scope.
How It Works
Add TaxMCP to your AI assistant, then ask tax questions the way you normally would.
Add TaxMCP from the ChatGPT or Claude plugin directory. Other MCP clients connect through the hosted server URL.
Ask tax questions in plain English. “What are the QBI deduction requirements?” “Show me §199A.” TaxMCP searches the relevant IRC, regs, and rulings.
Open the section, ruling, or guidance behind the response. Follow related provisions and bring the source into your review.
Core Capabilities
Find the relevant law, understand how it connects, and carry the supporting material into your workpapers or client response.
Ask questions the way you think about them. “Can my client deduct home office expenses?” returns the exact IRC sections, regs, and rulings that answer it.
Every result names the relevant section or guidance and links directly to the underlying material.
See how sections connect. When you look up §199A, instantly find every regulation, ruling, and related code section that references it, and everything it references.
Search the Code, Treasury Regulations, IRS Publications and Notices, and Revenue Rulings and Procedures in one place.
Coverage is checked against official government sources regularly, and the index is updated as published law and guidance change.
Pricing
No demo required. Begin with 20 searches a day, move to unlimited federal research for $9 a month, or add Tax Court and state coverage with Pro+.
Free
For individual CPAs, EAs, and tax professionals getting started with AI research.
Pro
Unlimited access to every federal tax source. For practitioners who need comprehensive research.
Pro+
For practices that need case law and multi-state coverage. Adds Tax Court opinions and state tax codes on top of everything in Pro.
Pro+ Coverage
Pro+ extends the federal library with case law and multi-state research for practices that need to move beyond the Code and IRS guidance.
Retrieve opinions by citation or case name back to 1942, then use a graph built from 500,000+ links between opinions to see how cases connect.
Iowa, Kentucky, Louisiana, Missouri, and Utah are the newest additions, with more coverage rolling out through 2026.
+ 16 more jurisdictions on the roadmap
Need a state that’s not listed? Let us know →Built for Review
The research is designed to support an accountant’s analysis, not replace it.
Apply the law to your client’s facts, resolve uncertainty, and make the final recommendation. TaxMCP supplies research for that process.
Results identify the section, ruling, opinion, or guidance behind the response, with a direct link for reviewer follow-through.
No client return or supporting documents are required. MCP tool arguments are not persisted by TaxMCP.
Read the data-handling details →Start on the free plan, compare the response with your own research, and decide when TaxMCP belongs in your workflow.
FAQ
TaxMCP is a tax research connector for Claude, ChatGPT, and other MCP-compatible AI clients. It retrieves federal and state tax law with direct links to the underlying material.
TaxMCP is built for CPAs, enrolled agents, tax attorneys, tax preparers, and accounting firms that want source-linked tax research in Claude, ChatGPT, or another MCP client.
Open the source link in the result, review the cited section or authority, and confirm the effective date and version for your facts.
TaxMCP covers the Internal Revenue Code, Treasury Regulations, 29 IRS Publications, IRS Notices from 2003–present, and Revenue Rulings and Revenue Procedures from 2019–present. Pro+ adds 49,000+ U.S. Tax Court opinions dating to 1942 and state tax codes across supported jurisdictions.
TaxMCP retrieves public tax authority and does not require a client return or supporting documents. MCP tool arguments are not persisted by TaxMCP.
TaxMCP helps you find and inspect the relevant law. Apply your professional judgment to the facts and review the linked material before relying on the response.
TaxMCP works with Claude Desktop and ChatGPT, plus other MCP-compatible clients.
Current Tax Answers
Concise tax answers with effective dates, limits, and links to the controlling government sources.
72.5¢ through June; 76¢ beginning July 1.
Up to a $25,000 deduction for qualified tips.
Up to $12,500, or $25,000 on a joint return.
Up to $10,000 for a qualifying new vehicle loan.
California does not conform to federal §168(k) bonus depreciation.
A 61-day window can defer losses on substantially identical securities.
From the Blog
A practical test for solo CPAs comparing AI tax research tools by source quality, coverage, review time, and cost.
See how TaxMCP powers source-linked agentic AI tax research, what a safe research agent should do, and where CPA review and firm controls still matter.
Use TaxMCP with ChatGPT or Claude for source-linked AI tax research. A 2026 CPA workflow with prompts, verification steps, and primary-source citations.
A TaxMCP guide to AI tax research tools, with a source-first recommendation and a comparison of search, citations, coverage, and workflow fit.
A practical 15-minute workflow for turning a client message into a clear answer, a primary-source citation, and a reviewable file note.
An AI tax research assistant combines a conversational model with tax authority it can retrieve. Here is what it should show you before you rely on an answer.
Free Resource
A free SKILL.md for structured tax research across the IRC, Treasury Regulations, IRS rulings, and Tax Court. Use it in Claude Code or the Claude apps.