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Nylon for Claude
Cited federal tax research, inside Claude
Nylon for Claude connects Claude to Nylon’s library of US federal tax law: the Internal Revenue Code, Treasury Regulations, IRS guidance and U.S. Tax Court opinions. Claude searches and reads the sources, then cites each one with a link you can check. Set it up in about two minutes with a Nylon Adviser or Elite seat.
Read-only access
Your own Nylon sign-in
SOC 2 Type 2
ISO 27001
Claude
Nylon connected
Using Nylon, what is the estimated tax safe harbor for an individual?
Searched Nylon’s library
Read 2 documents
An individual generally avoids the underpayment penalty if withholding and timely estimated payments cover the lesser of 90% of the current year’s tax or 100% of the prior year’s tax, provided the prior year was a full 12-month year and a return was filed for it [1]. The prior-year figure rises to 110% if that year’s adjusted gross income exceeded $150,000, or $75,000 if married filing separately [2].
1
IRC §6654(d)(1)(B)
Nylon
2
IRC §6654(d)(1)(C)
Nylon
Illustrative example
Nylon for Claude at a glance
What it is
A read-only connector that adds Nylon’s search and documents to Claude, built on the Model Context Protocol (MCP).
What Claude can read
The Internal Revenue Code, Treasury Regulations, IRS guidance such as Revenue Rulings, Revenue Procedures and Notices, and U.S. Tax Court opinions. State tax isn’t covered.
Who can use it
Anyone with a Nylon Adviser or Elite seat, on any Claude plan: Free, Pro, Max, Team or Enterprise.
Where it works
Claude on the web, Claude Desktop, Cowork, the Claude mobile apps and Claude Code.
What you can ask Claude with Nylon
Start your question with “Using Nylon” and Claude will search Nylon’s library before it answers.
Federal · Depreciation
“Using Nylon, what is the Section 179 expensing limit for property placed in service in 2026, and how does the phase-out work? Cite the Code and the revenue procedure.”
Federal · Home office
“Using Nylon, when can a self-employed client deduct a home office under IRC §280A, and how does the simplified method in Rev. Proc. 2013-13 work?”
Federal · S corporations
“Using Nylon, how do the IRS and the Tax Court decide whether an S corporation shareholder-employee’s salary is reasonable compensation? Cite the cases.”
Federal · Like-kind exchanges
“Using Nylon, how do the 45-day identification and 180-day exchange periods work in a deferred §1031 exchange? Cite §1031(a)(3) and Treas. Reg. §1.1031(k)-1.”
Federal · Estimated tax
“Using Nylon, when does the 110% prior-year safe harbor apply to an individual’s estimated tax payments under §6654?”
Federal · Tax procedure
“Using Nylon, how long does the IRS have to assess additional tax, and when does the six-year period in §6501(e) apply?”
How Nylon works inside Claude
01
You ask in Claude
Switch Nylon on under + → Connectors, or start your question with “Using Nylon”.
02
Claude searches Nylon
Claude runs keyword and meaning-based searches across the Internal Revenue Code, Treasury Regulations, IRS guidance and Tax Court opinions.
03
Claude reads and cites
Claude opens the documents it needs, answers from their text and links every citation to the source in Nylon.
How to add Nylon to Claude
You need a Nylon Adviser or Elite seat and any Claude plan. The Free plan allows one custom connector.
Free, Pro and Max
In Claude, open Customize → Connectors.
Choose + Add, then Add custom connector.
Name it Nylon, paste the URL below and choose Continue.
Under OAuth client, choose Register automatically, then Add.
Sign in to Nylon and choose Allow access.
Connector URL
https://mcp.usenylon.com/mcp
In a chat, choose + → Connectors and make sure Nylon is switched on.
Claude on its own vs Claude with Nylon
Where answers come from
Its training data and, if you turn it on, web search
Nylon’s library of the Internal Revenue Code, Treasury Regulations, IRS guidance and Tax Court opinions
Citations
Can be missing, general or hard to check
Each citation links to the document in Nylon
What Claude reads
Snippets of web pages
The text of the Code section, regulation, IRS ruling or opinion itself
Who controls access
Your Claude account
Your Nylon sign-in, and your admin can switch connections off
What’s in Nylon’s library
Nylon covers US federal tax law. State tax isn’t covered.
Code and regulations
The Internal Revenue Code and Treasury Regulations.
IRS guidance
IRS guidance, including Revenue Rulings, Revenue Procedures and Notices.
Tax Court opinions
Opinions of the U.S. Tax Court.
Read-only, and under your firm’s control
Nylon for Claude gives Claude access to Nylon’s library, and nothing else in your account.
Read-only
Claude can search Nylon’s library and read documents. It can’t upload, edit or delete anything.
Your own sign-in
Each person connects with their own Nylon account. Claude never sees your Nylon password.
Private by design
Claude can’t see your Nylon chat history, folders or saved work, or change account, billing or team settings.
Admin control
Admins can turn off Allow AI tool connections for the whole organization at any time.
“There isn’t a day when we don’t use Nylon. The research is so specific, complete, and trustworthy.”
Baqir Hussein, FCCA · Founder & Director, Finex Chartered Certified Accountants
Nylon for Claude: frequently asked questions
More detail is in the Claude setup guide, or email support@usenylon.com.
Which Claude plans work with Nylon?
All of them: Free, Pro, Max, Team and Enterprise. The Free plan allows one custom connector.
Which Nylon plan do I need?
An Adviser or Elite seat, billed monthly per user with no minimum term. Starter seats don’t include the AI connector.
What can Claude search in Nylon?
US federal tax law: the Internal Revenue Code, Treasury Regulations, IRS guidance such as Revenue Rulings, Revenue Procedures and Notices, and U.S. Tax Court opinions. State tax isn’t covered.
How is this different from asking Claude directly?
On its own, Claude answers from its training data and, if you turn it on, the web. With Nylon, it searches a curated library of primary federal tax sources, reads the documents and links each citation to the source so you can check it.
Can Claude change anything in Nylon?
No. The connector is read-only. Claude can search and read documents, but it can’t upload, edit or delete anything, or see your chat history, folders or saved work.
Does it work in Claude Desktop, mobile and Claude Code?
Yes. Add Nylon once and it’s available in Claude on the web, Claude Desktop and Cowork, and in the Claude mobile apps the next time you sign in. In Claude Code, run: claude mcp add --transport http nylon https://mcp.usenylon.com/mcp
How do I set it up for my whole firm?
On Claude Team or Enterprise, an Owner adds Nylon once in Organization settings → Connectors. Each person then connects with their own Nylon sign-in. Nylon admins control access with Allow AI tool connections.
How do I disconnect Nylon from Claude?
Remove Nylon in Customize → Connectors. A Nylon admin can also turn off Allow AI tool connections for the whole organization.
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Developer docs ↗
Endpoint, sign-in, tools and errors.
Last updated October 31, 2026. Claude is a trademark of Anthropic. Nylon isn’t affiliated with or endorsed by Anthropic.