IRS TIN Matching: Check a Sub’s Name and TIN Before You File
A W-9 tells you what the sub says its name and taxpayer identification number are. TIN matching is the IRS service that tells you whether its records agree, before you file the 1099 rather than months after. Here’s who can use it, how to sign up, when to run it, and what to do with a mismatch.
IRS TIN matching is an e-service that lets a payer that files information returns check name and TIN combinations against IRS records before filing. You need an IRS online account, your business must be in the IRS's Payer Account File (it has filed Forms 1099 in the last two years), and you apply as a payer of income subject to backup withholding. Checking before you file means fewer CP2100 and penalty notices, and a verified match can generally be relied on as reasonable cause. Results are confidential.
In this guide
What TIN matching does
When you file a 1099, the IRS compares the payee’s name and TIN with its own records. A mismatch comes back months later as a CP2100 notice, and with it the duty to send a B notice and, if the sub doesn’t answer, to start backup withholding. A penalty notice for the incorrect return can follow.
TIN matching moves that comparison to before you file. You give the IRS a name and a TIN; it tells you whether that combination matches its records. The IRS’s own words for the benefit: payers who validate before filing should receive fewer CP2100 and penalty notices, and a verified match can generally be relied on as reasonable cause, the standard that decides whether a penalty is waived.
It answers one question only: does this name go with this number? It doesn’t tell you the right number, look up an EIN from a business name, or say anything about the sub’s license or insurance.
Who can use it, and how to sign up
- Payers that file information returns, and their authorized agents. It isn’t a public lookup: it exists for checking payees you report on.
- Your business must be in the IRS’s Payer Account File. Payers are added after filing Forms 1099 in the last two years, so a business filing its very first 1099s can’t use it yet.
- You need an IRS online account, and then you complete an application to take part as an authorized payer of income subject to backup withholding. Nonemployee compensation on a 1099-NEC is that kind of income.
- Interactive or bulk. Check a handful of names on screen, or upload a file and collect the results from your secure mailbox.
Start at the IRS’s TIN Matching page. Allow time for the application in December, not on January 30.
Keep the results to yourself. Anything you learn through TIN matching has to be kept confidential under the IRS regulations. Use it to fix your own records and ask the sub for a corrected W-9; don’t pass the result on.
When to run it
- When a W-9 arrives, if you’re already registered. A mismatch found at onboarding is a two-minute email; the same mismatch found in a CP2100 is a B notice and a withholding deadline.
- In early January, before you file, for every sub getting a 1099-NEC. Names change during the year: an LLC is formed, a business is sold.
- After a sub sends a corrected W-9, to confirm the fix before it goes on a return.
You’ll need each sub’s exact name and TIN from their W-9 in one list. That list is the part you can prepare all year.
What causes a mismatch, and what to do
Most mismatches aren’t fraud. They’re the right number filed under the wrong name, and the W-9 instructions say which name belongs with which number:
| What happened | The fix |
|---|---|
| A sole proprietor's business name was filed with their SSN | File under the individual's name from line 1 of the W-9; the business name goes on line 2 |
| A single-member LLC's name was filed with the owner's SSN | A disregarded LLC is filed under the owner's name (line 1) with the owner's number |
| The sub's name changed (marriage, a new entity, a sale) | Ask for a new W-9 that matches the TIN the IRS has |
| A digit was mistyped when the W-9 was keyed in | Correct your records from the W-9 itself |
| The sub gave a number that isn't theirs | Ask for a corrected W-9 in writing; without a correct TIN, backup withholding applies |
Ask for the correction in writing and keep the request. How to request a W-9 has an email you can adapt, and W-9 for an LLC covers the LLC cases that cause most of these.
How TrackMyVendor automates this
- Each W-9 is read for you: the name on line 1, the business name, the classification and the full TIN, so nobody retypes a number.
- The 1099 sheet puts every sub’s name and TIN from their newest W-9 in one spreadsheet, ready to check, and flags anyone without a W-9. Account owners download it.
- A corrected W-9 goes through the same secure link, and the newest one is the one the sheet uses.
TrackMyVendor doesn’t run TIN matching or check numbers with the IRS: only a registered payer can. It gives you a clean list to check.
Start collecting W-9s freeEvery sub's name and TIN in one list?
Everything above is a check you can run by hand. This is what it looks like when it runs itself.
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- Your first 25 subs, no credit card
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- Each W-9 read for you, and a 1099 sheet that flags anyone without one
Per-deadline alerts at 90, 60, 30 and 7 days, sent to your team and to the sub, start on Starter. Compare plans
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Frequently Asked Questions
What is IRS TIN matching?
Who can use IRS TIN matching?
Can I look up a contractor's EIN with TIN matching?
Why would a sub's name and TIN not match?
Does TIN matching protect me from penalties?
This guide summarizes the IRS’s TIN Matching page and its Form W-9 instructions as of November 2026. It isn’t tax advice; the IRS page has the current requirements for registering.