No you do not have to re-submit the Tax Returns that you submitted with the ITIN as your Tax Payer Identification Number. Instead you must report the cancellation of your ITIN to the IRS and let them know that you now have an Social Security Number. This process is called "Rescinding your ITIN". This is helpful in the long run to keep your Tax History and Credits intact with the IRS.
For instructions on Rescinding your ITIN please read below:
"Once a
SSN has been issued, you must use this 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 they 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
