Can an ITIN Be Used on a W-2? Penalties and Employer Steps

No, an ITIN cannot be used on a W-2. The IRS General Instructions for Forms W-2 and W-3 tell employers not to accept an Individual Taxpayer Identification Number in place of a Social Security Number for employee identification or W-2 reporting.¹ The ITIN exists for federal tax filing only and does not authorize anyone to work in the United States.² Even so, if a W-2 has already been issued to someone with an ITIN, that income still has to be reported, and the IRS has a specific way to handle the mismatch.

Why the W-2 Requires an SSN

A W-2 does two jobs at once. It reports wages and withholding to the IRS, and it feeds the Social Security Administration’s earnings record. Federal law requires the W-2 to carry an identifying number for the employee whenever wages subject to Social Security tax have been paid.³ In practice, that number is the SSN, because the SSA uses it to credit lifetime earnings that later determine retirement and disability benefits.⁴

An ITIN has no connection to the Social Security system, so wages reported under one would never be credited to any benefits record. ITINs start with a “9” and have specific ranges in the fourth and fifth digits (50–65, 70–88, 90–92, and 94–99), so they are easy to spot on a document.¹ The W-2 instructions also tell employers not to auto-populate an ITIN into box “a,” the SSN field.

The rule ties into employment eligibility as well. Form I-9 instructions state directly: “Do not enter an Individual Taxpayer Identification Number (ITIN) as your Social Security number.”⁵ Employers using E-Verify hit the wall even sooner, because E-Verify requires an SSN to run its check against SSA and DHS records, and an ITIN fails immediately.⁶

What an Employer Should Do When a Worker Only Has an ITIN

The employer must reject the ITIN for W-2 purposes and ask the employee to provide a valid Social Security Number. If the employee doesn’t have a card, they should apply for one with Form SS-5 at the SSA.¹

If the SSN application is still pending at the W-2 filing deadline, the employer writes “Applied For” in the SSN field on a paper W-2, or enters all zeros when filing electronically. Once the SSN comes through, the employer files a corrected Form W-2c showing the correct number.⁷

Withholding does not pause while this gets resolved. The employer keeps withholding federal income tax based on the employee’s Form W-4, plus Social Security tax at 6.2% and Medicare tax at 1.45%, regardless of whether a valid SSN is on file yet.⁸

Penalties for Putting an ITIN on a W-2

Knowingly filing a W-2 with an ITIN in the SSN field exposes an employer to penalties from two directions.

IRS Information Return Penalties

Filing a W-2 with an incorrect taxpayer identification number triggers penalties under the Internal Revenue Code, tiered by how quickly the employer corrects the error:

Corrected within 30 days of the deadline: $60 per form.
Corrected after 30 days but before August 1: $130 per form.
Not corrected by August 1 or never filed: $340 per form.
Intentional disregard: $680 per form, with no annual cap.

That last tier is the one that applies when the IRS determines the employer deliberately ignored the SSN requirement, and there is no maximum on the total assessed across all affected forms.

Immigration Penalties

The Department of Homeland Security can impose separate civil fines for Form I-9 violations, including knowingly hiring or continuing to employ someone not authorized to work in the United States. These civil monetary penalties adjust for inflation and increase for repeat offenses, and a pattern or practice of violations can bring criminal penalties.⁹

How to File a Tax Return When You Have an ITIN and a W-2

If you have an ITIN and were issued a W-2 anyway, you still have a legal obligation to report the income. The IRS is not asking about immigration status on Form 1040; it is asking that income be reported and taxed.

On the return, put your ITIN at the top of Form 1040 as your taxpayer identification number. When you enter the W-2 information, use the SSN exactly as it appears on the W-2 the employer issued, even though it does not match your ITIN. The IRS calls this an “ITIN/SSN mismatch.” These returns used to be paper-only, but IRS programming changes now allow electronic filing of returns with this type of mismatch.¹⁰

The IRS generally credits the income tax withholding shown on the W-2 to the ITIN filer, though a mismatch can prompt additional review. Keep pay stubs and employment records to substantiate wages and withholding if asked.

One limit to know: ITIN holders are not eligible for the Earned Income Tax Credit, even if their dependents have valid SSNs.¹⁰

What Happens With the Social Security and Medicare Taxes

Federal law defines “employment” for FICA purposes to cover services performed by an employee within the United States “irrespective of the citizenship or residence of either” the worker or the employer.¹¹ Wages paid to an unauthorized worker are still subject to Social Security and Medicare taxes, and the withholding is legally correct.

The result is uncomfortable but consistent: FICA is properly withheld, yet without a valid SSN the SSA will not credit those earnings to any benefits record. Because the taxes were not withheld in error, an unauthorized worker generally cannot use Form 843 to claim a refund of them.¹²

When FICA Refunds Actually Apply

Form 843 is for situations where FICA was genuinely withheld by mistake. The most common cases involve certain visa holders:

F-1, J-1, M-1, and Q visa holders present in the U.S. fewer than five calendar years are generally exempt from Social Security and Medicare taxes on wages earned to carry out the purpose of the visa.¹³
H-2A agricultural workers admitted as nonresident aliens are exempt from FICA on compensation connected to their H-2A work.¹⁴
Workers from countries with a totalization agreement may pay Social Security taxes to their home country instead of the U.S.¹⁴
Students who work for the school, college, or university where they are enrolled at least half-time are exempt on that on-campus work, incidental to their studies. The exemption does not extend to off-campus employers.¹³

If you fall into one of these categories and your employer withheld FICA anyway, ask the employer to correct the overcollection first. If the employer refuses, file Form 843 with the IRS to claim a refund of the employee’s share.¹² Publication 519 has the detailed procedure for nonresident aliens.¹⁴

ITINs Are Fine on a 1099-NEC

The prohibition applies to W-2s, not to every tax form. An ITIN can be used on Form 1099-NEC for independent contractor payments. When someone performs services as an independent contractor, the hiring party does not complete Form I-9 and does not withhold FICA, so the ITIN functions as a valid taxpayer identification number in the same field where an SSN would normally appear. If a contractor provides no valid TIN at all, the payer must apply backup withholding at 24% on reportable payments.⁷

If You Get an SSN After Using an ITIN

Once you receive an SSN, stop using the ITIN immediately and use only the SSN for all tax purposes. You cannot keep both active.²

Notify the IRS so it can combine your tax records. Skipping this step can cost you credit for wages and taxes withheld under the ITIN, which may reduce a refund you’re owed.¹⁵ Write a letter to the IRS with your full name, mailing address, ITIN, a copy of your Social Security card, and a copy of the CP 565 Notice of ITIN Assignment if you still have it. Mail it to:

Internal Revenue Service
Austin, TX 73301-0057

You can also visit a local IRS office in person. Once processed, the IRS voids the ITIN and associates prior tax information filed under it with your new SSN.¹⁵

Fixing Prior-Year W-2s

If a past W-2 carries the wrong SSN and the employer is willing to fix it, the employer files Form W-2c (Corrected Wage and Tax Statement) with the SSA. The W-2c shows your correct SSN in box “d” and the previously reported incorrect number in box “f.”¹⁶ Getting that correction filed is the only way the SSA can credit those prior-year earnings to your benefits record under your new SSN.

1
Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026) – Section: Taxpayer Identification Numbers (TINs)
2
Internal Revenue Service. Individual Taxpayer Identification Number (ITIN)
3
Office of the Law Revision Counsel. 26 USC 6051 Receipts for Employees
4
Social Security Administration. How to Correct Your Social Security Earnings Record
5
U.S. Citizenship and Immigration Services. Form I-9 Instructions
6
E-Verify. E-Verify and Form I-9
7
Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide
8
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
9
U.S. Citizenship and Immigration Services. Penalties
10
Internal Revenue Service. Individual Taxpayer Identification Number (ITIN) Reminders for Tax Professionals
11
Office of the Law Revision Counsel. 26 US Code 3121 – Definitions
12
Internal Revenue Service. Instructions for Form 843 (12/2024)
13
Internal Revenue Service. Foreign Student Liability for Social Security and Medicare Taxes
14
Internal Revenue Service. U.S. Tax Guide for Aliens
15
Internal Revenue Service. Additional ITIN Information
16
Internal Revenue Service. Form W-2c Corrected Wage and Tax Statement (Rev. January 2026)