Understanding Your CP310 Notice

What this notice is about

We assigned you a Personal Identification Number (PIN) to associate your existing Centralized Authorization File (CAF) number through Tax Pro Account for identity assurance.

You don't need to call or respond to this notice.

What you need to do with the PIN

Use the PIN number to verify your identity and complete your request:

  • Sign in to Tax Pro Account.
  • Associate your CAF number to your personal information by entering your PIN.

You may want to

  • Keep your PIN in a safe place for your records.
  • Call the IRS number at the top of your notice if you didn't request a PIN or if you have questions.

Important things to remember about your PIN

  • It can only be used to verify ownership of your CAF number in Tax Pro Account and will expire in 30 days.
  • It is unique to your CAF number.
  • It is for your use only. Keep it secure and don't share it with anyone.

Helpful information

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