Understanding Your CP561A Notice


What this notice is about

We have 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, fax your information to the fax number in the notice using either a fax machine  or an online fax service. Protect yourself when sending digital data by  understanding the fax service’s privacy and security policies.

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Frequently asked 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.

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