Understanding Your CP561A Notice

What this notice is about

Important Information about your child's Adoption Taxpayer Identification Number (ATIN) - Your child's ATIN expires in 3 months. 


What you need to do

  • Complete Form 15100, Adoption Taxpayer Identification Number (ATIN) (PDF) Extension Request, included with your notice if you received a Social Security number (SSN) for your child, or;

  • Apply for a one-year extension of this ATIN by completing Form 15100, if you don't have an SSN.

  • Detach notice stub, mail it with Form 15100 in the envelope provided. If you prefer, you can fax it using the information provided on the form.


You may want to


Answers to common questions

What can I do if I don't have a Social Security number (SSN) for my adoptive child?

You can request an extension before your assigned ATIN expires by completing Form 15100 included with your notice. The extension is only valid for 1 additional year.

Printable samples of this notice (PDF)

Need Help?

  • You can authorize someone to contact the IRS on your behalf.
  • See if you qualify for help from a Low Income Taxpayer Clinic.
  • If you can’t find what you need online, you can call the IRS at the 800, 866, or 888 number listed on the notice.