The IRS needs to be notified of the change from ITIN to SSN.
Once you qualify and obtain a SSN, you are required to notify the IRS of the change and discontinue using the ITIN. Once notified, the IRS will combine your tax records and begin using your SSN. Because the IRS automatically combines all of your tax records, you do not have to file an amended return to change the ITIN to a SSN. The IRS will automatically make the change to your tax return once it receives your request.
Yes. You can go to an IRS office to submit the necessary documentation for your SSN. To check the status of your ITIN to the SSN, you can call the IRS toll-free at 800-829-1040 if you are in the United States or 267-941-1000 (not a toll-free number) if you are outside the United States.
The following links will help to find the office nearest you.
Or you can mail the information. Make a copy of your Social Security card.
Make a copy of your CP565 notice, which is the Notice of ITIN Assignment you received from the IRS when assigned your ITIN.
Attach the copies of your Social Security card and the CP565 form to the back of the letter.
Sign and date the letter. Mail all three documents to: Internal Revenue Service Austin, TX 73301-0057
As Opus 17 mentioned before:
If the taxpayer already filed their tax return using the ITIN, they need to file an amended return by the April 18 deadline in order to claim the larger child tax credit, EIC, or any other benefits that require a valid SSN.
[Edited 02/15/23|1:06 PM PST]
@tapo-1981
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