Yes, you need to complete Form 14039 to let the IRS know there's a potential problem. Get started here.
The very first thing to do is to make sure that your name and Social Security number is correct on the return. Assuming that it is, you will need to print and mail in your return this year.
Complete Form 14039 and follow any other instructions you get form the IRS in a letter. The IRS won't call you, text you, or send you an email as the first contact.
Taxpayers can go to Get an Identity Protection PIN to get more information on protecting their tax account. An authentication check will need to be completed to create an online account, but once this is done an IP PIN will be provided online immediately.
You can complete the Identity Theft Affidavit to begin the process to find out if a fraudulent return was filed using your name and credentials.