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You can't have both an ITIN and a Social Security number (SSN).  

Once you get an SSN you should stop using your ITIN and use your SSN for tax purposes.

There are certain credits that you can only take if the SSN was issued prior to the due date of your tax return. For example, the Child Tax Credit and/or Additional Child Tax Credit).

You should also notify the IRS when you get your SSN. The IRS will combine all your tax records under your new  SSN. If you don't notify the IRS, you may not receive credit for all wages paid and taxes withheld. This could reduce the amount of any refund you are due.

You can notify the IRS by mail or by visiting a local IRS office.

To notify the IRS by mail, you can write a letter stating you were assigned an SSN and want your tax records combined.

You must include the following information::

• Full name
• Mailing address
• ITIN and a copy of the CP565 Notice of ITIN Assignment, if available
• Copy of your Social Security card

You will mail the letter to :

Internal Revenue Service
Austin, TX 73301-0057

We'll void your ITIN and associate all prior tax information filed under the ITIN with the SSN.

Click here for "Individual taxpayer identification number (ITIN)"