You must use the social security number. Once you receive a SSN, you must use that number for tax purposes and
discontinue using your ITIN. It is improper to use both the ITIN and
the SSN assigned to the same person to file tax returns. It is your
responsibility to notify the IRS so we can combine all of your tax
records under one identification number. If you do not notify the IRS
when you are assigned a SSN, you may not receive credit for all wages
paid and taxes withheld which could reduce the amount of any refund
due. You can visit a local IRS office or write a letter explaining that
you have now been assigned a SSN and want your tax records combined.
Include your complete name, mailing address, and ITIN along with a copy
of your social security card and a copy of the CP 565, Notice of ITIN
Assignment, if available. The IRS will void the ITIN and associate all
prior tax information filed under the ITIN with the SSN. Send your
letter to:
Internal Revenue Service
Austin, TX 73301-0057
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