Understanding your CP171 notice


What this notice is about

This notice reminds you about the amount you owe in tax, penalty, and interest.

What you need to do

Read your notice carefully. It explains how much money you owe on your taxes.

You may want to

  • Make payment arrangements if you cannot pay the full amount you owe.
  • Learn more about your payment options.

Frequently asked questions

Yes, interest accrues on your unpaid balance until you pay it in full.

Yes, you receive a late payment penalty.

You can arrange to make a payment plan with us if you cannot pay the full amount you owe.

Call the toll-free number listed on the top right corner of your notice to discuss payment options or learn more about payment arrangements.

Tips for next year

Consider filing your taxes electronically. Filing online can help you avoid mistakes and find credits and deductions for which you may qualify. In many cases, you can file for free. Learn more about how to file electronically.

Helpful information

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