Understanding your CP161 notice

What this notice is about

You received this notice because you have an unpaid balance due.

What you need to do

  • Read your notice carefully ― it explains how we calculated the amount due.
  • Compare the figures on the notice with your tax return.
  • Check the list of payments we applied to your account to see if we applied all the payments you made.
  • Contact us within 10 days of the date of your notice if you think we made a mistake.
  • Pay the amount due by the date on the notice.
  • Contact us to make payment arrangements if you can't pay the full amount you owe. You can also read more about payment options.

You may want to

Frequently asked questions

Will you charge me additional interest on the amount I owe?

We don’t charge additional interest if you pay the full amount you owe by the payment due date. However, interest will continue to increase on the unpaid balance after the payment due date.

Will I receive a penalty if I can't pay the full amount?

Yes. You will receive a late payment or failure to deposit penalty, depending on what you owe. Notice 746, Information About Your Notice, Penalty and InterestPDF, has more information about penalties and interest.

What happens if I can't pay the full amount I owe?

You can request a payment plan if you can't pay the full amount you owe. Call us at the toll-free number on your notice to discuss payment options or learn more about them.

What should I do if I disagree with the notice?

Contact us at the toll-free number on your notice. Please have your documentation (such as cancelled checks, amended return, etc.) ready when you call.

Helpful information

Need help?