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If you had issues with your kids being fraudulently claimed, probably an IRS identity protection pin is the issue.

There are several kinds of pins. 

Choose which PIN and see the article related:

• If you mean the filing pin from last year, you can use your AGI instead. How do I find last year’s AGI?
• If you mean the IP PIN for identity protection:
  • If you just need to get back to it in the program, see How I add my IP pin
  • If you lost or never got your CP01A letter, you can Retrieve Your IP PIN 
• If you live in IL, you can look it up on Illinois’ website, IL-PIN Inquiry - Illinois.gov