Understanding Your CP40 Notice

What this notice is about

We are notifying you that we’ve assigned your tax account to a private collection agency for collection.


What you need to do

  • Read the notice carefully. It contains important information about what happens next.
  • File any unfiled tax returns that you’re required to file.
  • Keep the CP40 notice for your records. You’ll need information from it to complete the two-party verification with the collection agency, explained below.


You may want to


Additional Information

  • The private collection agency will verify your personal information to protect the security and privacy of your tax information. They’ll also perform two-party verification by asking you for the first five numbers of your taxpayer authentication number shown at the top of your notice. The private collection agency will then supply the next five numbers.
  • You can find Publications 1 and 4518 referenced above by visiting www.irs.gov/forms or by calling 800-TAX-FORM (800-829-3676).

Frequently asked questions

Why was my account transferred to a Private Collection Agency?

IRS is required by law to contract with private collection agencies to assist in the collection of certain unpaid tax accounts.

How can I be sure the private collection agency contacting me is under contract with the IRS?

Your CP40 notice contains the name and contact information of the private collection agency assigned your account. The names of all the private collection agencies under contract with the IRS can be found on IRS.gov, keyword search “Private Debt Collection.” The private collection agency will also send you a letter confirming assignment of your tax account.

Can I make arrangements to pay my taxes over time with the private collection agency?

Yes, the private collection agency will work with you to set up a payment arrangement if you can’t full pay when contacted.

Need Help?

  • See if you qualify for help from a Low Income Taxpayer Clinic.
  • If you can’t find what you need online, call the IRS number at the top of your notice or letter.