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Nylon for ChatGPT
Cited federal tax research in ChatGPT
Nylon for ChatGPT brings Nylon’s US federal tax library into ChatGPT: the Internal Revenue Code, Treasury Regulations, IRS guidance and U.S. Tax Court opinions. ChatGPT searches the sources, reads the documents and links every citation, so you can check the answer. Install it from ChatGPT’s plugin directory with a Nylon Adviser or Elite seat.
Read-only access
Your own Nylon sign-in
SOC 2 Type 2
ISO 27001
ChatGPT
Nylon connected
Using Nylon, how much estimated tax does an individual need to pay to avoid the underpayment penalty?
Searched Nylon’s library
Read 2 documents
An individual generally avoids the penalty if withholding and timely estimated payments cover the smaller of 90% of this year’s tax or 100% of last year’s tax [1]. If last year’s adjusted gross income was more than $150,000 ($75,000 if married filing separately), the prior-year figure rises to 110% [2].
1
IRC §6654(d)(1)(B)
Nylon
2
IRC §6654(d)(1)(C)
Nylon
Illustrative example
Nylon for ChatGPT at a glance
What it is
A read-only plugin that adds Nylon’s search and documents to ChatGPT, built on the Model Context Protocol (MCP).
What ChatGPT can read
The Internal Revenue Code, Treasury Regulations, IRS guidance (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 whose ChatGPT plan and workspace allow plugins.
Where it works
ChatGPT on the web. Install it from chatgpt.com/plugins, then type @ and choose Nylon in a chat.
What you can ask ChatGPT with Nylon
Type @, choose Nylon and start your question with “Using Nylon”. ChatGPT searches Nylon’s library before it answers.
Estimated tax · Safe harbor
“Using Nylon, when does an individual avoid the estimated tax penalty, and when does the 110% prior-year rule apply?”
Section 179 · Expensing
“Using Nylon, what is the Section 179 expensing limit for 2026, and where does the phase-out start?”
IRC §280A · Home office
“Using Nylon, when can a self-employed client deduct a home office, and how does the simplified method work?”
S corporations · Reasonable compensation
“Using Nylon, how does the IRS decide whether an S corporation shareholder-employee’s salary is reasonable compensation?”
IRC §1031 · Like-kind exchanges
“Using Nylon, what are the 45-day identification and 180-day exchange deadlines in a deferred like-kind exchange?”
IRC §469 · Passive losses
“Using Nylon, when can a real estate professional treat rental losses as nonpassive?”
How Nylon works inside ChatGPT
01
You ask in ChatGPT
Type @ and choose Nylon, then start your question with “Using Nylon”.
02
ChatGPT searches Nylon
ChatGPT runs up to five keyword and meaning-based searches at once across the Internal Revenue Code, Treasury Regulations, IRS guidance and Tax Court opinions in Nylon.
03
ChatGPT reads and cites
ChatGPT reads the Code section, regulation, ruling or opinion itself, answers from its text and links each citation to the source in Nylon.
How to add Nylon to ChatGPT
You need a Nylon Adviser or Elite seat. Your ChatGPT plan and workspace settings decide whether you can add plugins.
From the plugin directory
Open chatgpt.com/plugins and search for Nylon.
Open the Nylon listing and choose Install Plugin.
Sign in to Nylon and choose Allow access.
Start a new chat, type @ and choose Nylon.
Server URL, if you add Nylon by URL
https://mcp.usenylon.com/mcp
Start each question with “Using Nylon” so ChatGPT searches Nylon before it answers.
Business, Enterprise and Edu
Workspace admins decide which plugins members can install and who can add custom MCP servers. If you can’t find Nylon, ask your ChatGPT admin.
Add by URL
In chatgpt.com/plugins, choose + → Add custom MCP server. Under Connection, choose Public endpoint and paste the server URL, choose OAuth, then Create as a plugin and install it.
ChatGPT on its own vs ChatGPT with Nylon
Where answers come from
Its training data and, when it searches, the open web
Nylon’s library of the Internal Revenue Code, Treasury Regulations, IRS guidance and Tax Court opinions
Citations
Web links, if any, that can be general or hard to check
Each citation links to the document in Nylon
What ChatGPT reads
Snippets of web pages
The full text of the Code section, regulation, ruling or opinion
Who controls access
Your ChatGPT account and workspace
Your Nylon sign-in, and your Nylon admin can switch connections off
What’s in Nylon’s library
Nylon covers US federal tax. It doesn’t cover state tax.
Code and regulations
The Internal Revenue Code (Title 26 of the U.S. Code) and Treasury Regulations.
IRS guidance
Revenue Rulings, Revenue Procedures, Notices and other IRS guidance.
Tax Court opinions
Opinions of the U.S. Tax Court.
Read-only, and under your firm’s control
Nylon for ChatGPT gives ChatGPT access to Nylon’s library, and nothing else in your account.
Read-only
ChatGPT 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. ChatGPT never sees your Nylon password.
Private by design
ChatGPT 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.
Baqir Hussein, FCCA · Founder & Director, Finex Chartered Certified Accountants, one of 2,000+ firms in Australia, New Zealand and the UK using Nylon
Nylon for ChatGPT: frequently asked questions
More detail is in the ChatGPT setup guide, or email support@usenylon.com.
Which ChatGPT plans can use Nylon?
Your ChatGPT plan and workspace settings decide whether you can add plugins. On Business, Enterprise and Edu workspaces, an admin or owner controls which plugins are available.
Which Nylon plan do I need?
An Adviser or Elite seat. Starter seats don’t include the AI connector.
What can ChatGPT search in Nylon?
The Internal Revenue Code, Treasury Regulations, IRS guidance (Revenue Rulings, Revenue Procedures and Notices) and U.S. Tax Court opinions. State tax isn’t covered.
How is this different from asking ChatGPT directly?
On its own, ChatGPT answers from its training data and, when it searches, the web. With Nylon, it searches a curated library of federal tax sources, reads the documents and links each citation to the source so you can check it.
Can ChatGPT change anything in Nylon?
No. The plugin is read-only. ChatGPT can search and read documents, but it can’t upload, edit or delete anything, or see your chat history, folders or saved work.
Should I install from the directory or add Nylon by URL?
Use the plugin directory if you can: search chatgpt.com/plugins for Nylon and choose Install Plugin. If your workspace allows custom MCP servers, you can add https://mcp.usenylon.com/mcp by URL instead.
How do I make Nylon available to my whole firm?
On ChatGPT Business, Enterprise and Edu, workspace admins control which plugins members can install. Each person then connects with their own Nylon sign-in, and Nylon admins control access with Allow AI tool connections.
How do I disconnect Nylon from ChatGPT?
Remove Nylon from your ChatGPT plugins. A Nylon admin can also turn off Allow AI tool connections for the whole organization.
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Last updated October 31, 2026. ChatGPT is a trademark of OpenAI. Nylon isn’t affiliated with or endorsed by OpenAI.