Please read this link How to Get an Identity Pin from the IRS.
An IP PIN is a 6 digit code that is mailed to you through the Post Office or is given to you online after you have identified yourself fully. The presumption is that the person who stole your Social Security number would not have a way to get access to this number as well.
When you file, you will be asked if you have an IP PIN. If you have one, you MUST enter it in order to e-file successfully. Note that there is a new IP PIN each year.
The program has changed a little since I last dealt with it (I believe it is now open to all taxpayers, not just taxpayers who file Identity Theft claims), so read that link and related links carefully.
And was the entire SS number stolen or just the last four digits? A thief can't use the number to file unless they have all 9 digits.
Also, the first person to file with an SS number wins, so don't wait too long to file.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.