Penalty for Filing a 1099 Without a Social Security Number

If you file a Form 1099 without a Social Security number or other taxpayer identification number for the contractor, the IRS charges a per-return penalty between $60 and $340 depending on how quickly you fix the error, and at least $680 per return if the agency decides you ignored the requirement on purpose.¹ A separate rule also kicks in: you’re required to withhold 24% of every future payment to that contractor until they give you a valid number.²

The Penalty Tiers for 2026

The IRS treats a missing or incorrect TIN as a filing error under its information return penalty system. The amount depends entirely on how fast you file a corrected version. For returns due in 2026:¹

Corrected within 30 days of the due date: $60 per return
Corrected after 30 days but by August 1: $130 per return
Corrected after August 1, or never corrected: $340 per return

Small businesses with average gross receipts of $5 million or less over the prior three tax years get lower annual caps on total exposure: $239,000 for corrections within 30 days, $683,000 for corrections by August 1, and $1,366,000 for later or uncorrected returns.³

The clock runs from the original filing deadline. A Form 1099-NEC is due January 31 whether filed on paper or electronically; a Form 1099-MISC is due February 28 on paper, or March 31 if filed electronically.⁴ A 1099-NEC filed January 31 with a missing TIN and corrected by early March falls in the $60 tier. Wait until September and you’re at $340.

Intentional Disregard: $680 and No Cap

If the IRS concludes you knowingly filed without a correct TIN rather than making an honest mistake, the penalty rises to at least $680 per return with no annual maximum.¹ The difference between a $340 oversight penalty and the $680 floor almost always comes down to documentation. A business that can show it requested the TIN multiple times and followed the proper solicitation steps is in a far stronger position than one that filed with a blank TIN field and hoped for the best.

How the IRS Actually Charges You: Notice 972CG

The IRS doesn’t just add the penalty to your bill. Before assessing anything, it sends Notice 972CG identifying the specific returns with errors and the proposed penalty amount. You have 45 days from the notice date to respond, or 60 days if you’re a foreign filer.¹

That window is your chance to make a reasonable cause argument. Ignore the notice and the IRS assesses the full proposed penalty without further review.⁵ Responding with solid documentation of your solicitation efforts can reduce the penalty or eliminate it entirely.

The 24% Withholding Rule You Can’t Skip

Separate from the filing penalties, a missing TIN triggers a legal obligation to withhold 24% of every payment you make to that contractor. This isn’t optional. It begins as soon as you know the TIN is missing or incorrect.² If you fail to withhold when required, you could owe the IRS the amounts you should have withheld, even though the money already went to the contractor.

Withheld amounts don’t sit in your account until year-end. They have to be deposited with the IRS on a monthly or semiweekly schedule depending on your total liability, and reported on Form 945, which is filed separately from your 1099s and your payroll tax returns.⁶

Keep withholding until the contractor gives you a valid TIN. Once you have it, stop withholding no later than 30 calendar days after it arrives. You don’t send the corrected TIN to the IRS separately; you just update your records and stop withholding on future payments.⁷

How To Avoid the Penalty Before You File

The best defense is a documented paper trail showing you tried to get the TIN before filing. The IRS expects a specific sequence, and each step matters later if you have to make a reasonable cause claim.

Get a Form W-9 Before the First Payment

Form W-9 is the standard tool for collecting a contractor’s TIN.⁸ Collect a completed W-9 before issuing the first payment, and make it a condition of doing business. Once you have it, keep it on file. The IRS can ask to see it.

Follow the Required Solicitation Timeline

If a contractor doesn’t provide a TIN up front, the IRS expects this sequence:⁷

Initial solicitation when the business relationship begins
First annual solicitation by December 31 of that year, in writing
Second annual solicitation by December 31 of the following year, in writing

Each solicitation letter must warn the contractor that failing to provide a TIN can result in a $50 penalty assessed directly against them by the IRS.³ Including that warning isn’t just good practice. It’s part of the required solicitation process.

Verify TINs With the IRS Matching Service

When a contractor does provide a TIN, you can check it before filing. The IRS offers a free TIN Matching tool through its e-Services portal that compares the name and TIN combination against IRS records. The interactive version handles up to 25 lookups with immediate results; the bulk version processes up to 100,000 combinations within 24 hours.⁹ Catching a mismatch before filing avoids the penalty entirely, and it takes minutes.

What To Put in the TIN Field If You Still Don’t Have It

If you’ve exhausted your solicitation attempts and still don’t have a number, the IRS instructions direct you to leave the TIN field blank and file the return anyway.¹⁰ Not filing at all creates a separate failure-to-file penalty on top of the missing-TIN penalty, so a blank TIN is the lesser problem.

Building a Reasonable Cause Defense

Reasonable cause is the IRS standard for waiving information return penalties. It takes more than saying the contractor wouldn’t cooperate. You need to show you acted responsibly both before and after the failure.¹¹

The documentation that actually works includes copies of every W-9 request you sent with the exact dates, records of any responses or non-responses from the contractor, evidence that you met each December 31 deadline, and proof you began backup withholding when required. Businesses that lose reasonable cause arguments almost always failed on one of these points: they sent the letters but kept no copies, or kept copies but missed the annual deadlines.

If you accept W-9 submissions electronically, the IRS adds requirements. Your system must log every submission event, produce a hard copy of the electronic W-9 on request, and capture an electronic signature from the payee.¹⁰

The Contractor’s Own Penalty

Every penalty above falls on the business filing the 1099. The contractor who refuses to provide a TIN isn’t off the hook, though. Under federal law, a person who fails to furnish a correct TIN when required faces a $50 penalty per failure, up to $100,000 per calendar year.¹²

Your solicitation letters are required to mention this penalty, and it’s real leverage when someone drags their feet. The IRS can bill them directly, and you’re legally required to tell them so.

1
Internal Revenue Service. Information Return Penalties
2
Internal Revenue Service. Backup Withholding
3
Internal Revenue Service. 20.1.7 Information Return Penalties
4
Internal Revenue Service. General Instructions for Certain Information Returns (For Use in Preparing 2026 Returns)
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Internal Revenue Service. 4.19.25 Information Return Penalty (IRP) Procedures
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Internal Revenue Service. Instructions for Form 945 (2025)
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Internal Revenue Service. Understanding Your CP2100 or CP2100A Notice
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Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
9
Internal Revenue Service. Taxpayer Identification Number (TIN) Matching Tools
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Internal Revenue Service. General Instructions for Certain Information Returns
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eCFR. 26 CFR 301.6724-1
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Office of the Law Revision Counsel. 26 USC 6723 – Failure To Comply With Other Information Reporting Requirements