Once your Social Security card arrives, transferring your earnings and tax history from your ITIN to your SSN takes three coordinated moves: write to the IRS to void the ITIN and combine its records under your new SSN, give your employer the new card so payroll and any prior W-2s get corrected, and ask the Social Security Administration to reinstate the wages sitting in its Earnings Suspense File to your record. The order matters, and one rule about the Earned Income Tax Credit catches almost everyone off guard.
Notify the IRS to Merge Your ITIN Into Your SSN
This is the step people miss most often, and it causes the most trouble later. You cannot hold both an ITIN and an SSN at the same time. Once your SSN is issued, stop using the ITIN for tax purposes immediately and tell the IRS to merge your old ITIN records into the new number.1Internal Revenue Service. Additional ITIN Information If you skip this, the IRS has no way to know that the person who filed under the ITIN and the person now filing under the SSN are the same taxpayer, and you can lose credit for taxes you already paid.
You can handle it at a local IRS office or by mail. The mailing address is:
Internal Revenue Service
Austin, TX 73301-0057
Include a letter with your full name, mailing address, ITIN, and a copy of your new Social Security card. If you still have the CP 565 notice the IRS sent when your ITIN was first assigned, include a copy of that too.1Internal Revenue Service. Additional ITIN Information Once the IRS processes the request, it voids the ITIN and associates the prior filings with your SSN.
Update Your Employer and Get W-2s Corrected
Payroll still has your old ITIN or a mismatched number on file. Bring your Social Security card to HR or payroll as soon as you have it so future wages report to the right number. If your employer already filed a W-2 for the current or a prior year under the old number, they are required to submit Form W-2c (Corrected Wage and Tax Statement) to fix it.2Social Security Administration. Employer W-2 Filing Instructions and Information
Don’t assume payroll will spot the mismatch on its own. Confirm the update in writing and ask whether a W-2c will go out for any prior years. A corrected W-2 is what lets both the IRS and the SSA line your wages up under the SSN. If your employer won’t cooperate, you can go to the SSA directly with other proof of wages such as pay stubs or copies of prior tax returns.
Move Your Past Wages Out of the Earnings Suspense File
When an employer reports wages to the SSA and the name and Social Security Number don’t match SSA records, those wages get parked in the Earnings Suspense File. This is exactly what happens to workers paid under an ITIN or a mismatched number. As of 2021, the file held more than 381 million uncredited wage items.3Social Security Administration. Earnings Reported Without a Social Security Number or With an Incorrect Employee Name or Social Security Number Your prior earnings may be sitting there right now, credited to no one.
Once you provide the SSA with the corrected identifying information tied to your new SSN, those suspended wages can be reinstated to your earnings record.4Social Security Administration. Earnings Record Correction Process The SSA uses a mix of automated matching and manual review to process reinstatements. Gather whatever you have from the ITIN years to support the request: W-2s, pay stubs, tax returns filed under the ITIN, and employer statements.
This is not paperwork for its own sake. You need 40 Social Security credits to qualify for retirement benefits, and in 2026 you earn one credit for every $1,890 in covered earnings, up to four per year.5Social Security Administration. Benefits Planner – Social Security Credits and Benefit Eligibility Any year of wages left in the suspense file is a year that doesn’t count toward those 40.
Amend Prior Returns Where It Helps
After the IRS combines the ITIN and SSN records, review your past filings for errors or credits you couldn’t take before. Corrections go on Form 1040-X (Amended U.S. Individual Income Tax Return), one for each year you’re changing.6Internal Revenue Service. About Form 1040-X, Amended U.S. Individual Income Tax Return Common reasons include correcting the taxpayer identification number, fixing income figures, and claiming credits that weren’t available under an ITIN.
The deadline to amend for a refund is three years from the original filing date or two years from the date you paid the tax, whichever is later.7Office of the Law Revision Counsel. 26 USC 6511 – Limitations on Credit or Refund Miss that window and the refund is gone, so act quickly once your SSN is in hand. The IRS currently processes amended returns in 8 to 12 weeks, and some take up to 16.8Internal Revenue Service. Where’s My Amended Return?
What Changes and What Doesn’t for Prior-Year Tax Credits
Two credits come up constantly in this transition, and they behave differently on amended returns.
Earned Income Tax Credit
The EITC requires a valid SSN for the taxpayer, the spouse on a joint return, and any qualifying child. If any of those people had only an ITIN, the credit is off the table for that year.9Internal Revenue Service. Who Qualifies for the Earned Income Tax Credit (EITC)
Here is the part that catches people. You cannot go back and retroactively claim the EITC for years when you didn’t yet have an SSN. The PATH Act of 2015 blocks it. Your SSN must have been issued on or before the due date of the return, including extensions, for that tax year.10Internal Revenue Service. Basic Qualifications If your SSN arrives in 2026, you can claim the EITC on your 2026 return, but you cannot amend 2024 or 2025 to pick it up.
Child Tax Credit
The Child Tax Credit requires the child to have an SSN, though the filing parent can use either an SSN or an ITIN. If a child who previously had only an ITIN has since been issued an SSN, you may be able to amend prior returns to claim the credit, provided you’re still inside the three-year amendment window.11Internal Revenue Service. Child Tax Credit The PATH Act restriction that blocks retroactive EITC claims does not apply here in the same way.
Verify the Transfer Went Through
Don’t assume everything landed correctly because you mailed the letters. Give it a few months, then check both agencies.
On the SSA side, open a my Social Security account at ssa.gov/myaccount and review your full earnings history. The statement lists posted earnings by year, and gaps from the ITIN period will be obvious.12Social Security Administration. How to Correct Your Social Security Earnings Record If wages are missing, pull the W-2s, pay stubs, and returns for those years and start a correction with the SSA.
On the IRS side, request a tax account transcript for the ITIN years to confirm those filings now sit under your SSN. If they don’t, the merge hasn’t been processed yet, and it’s worth a follow-up call before you file anything new.
When Mismatches or Penalties Come Up
Small data mismatches are common during this transition. Names get transliterated differently on immigration documents and tax forms, and employers sometimes report wages under a slightly different spelling or the wrong number outright. These mismatches slow down the wage transfer and can trigger IRS notices.
Line your returns, W-2s, and SSA earnings statement up side by side and look for inconsistencies. Take tax-record issues to the IRS and earnings-record issues to the SSA. If your legal name isn’t the same across your Social Security card, tax filings, and employer records, fix that first, because most name-based mismatches won’t clear until it matches everywhere.
Unresolved issues from the ITIN years can still generate penalties, most commonly the failure-to-file or failure-to-pay penalty and the accuracy-related penalty on substantial underpayments.13Office of the Law Revision Counsel. 26 USC 6651 – Failure to File Tax Return or to Pay Tax14Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments If a penalty stems from confusion caused by the ITIN-to-SSN switch rather than intentional noncompliance, you can request abatement for reasonable cause; the IRS decides these case by case, and documentation of the transition strengthens the request.15Internal Revenue Service. Penalty Relief for Reasonable Cause