The Internal Revenue Service (IRS) sends a variety of notices to taxpayers regarding their tax obligations. One of these notices is the CP 521, also known as the Installment Agreement Reminder. This document serves as a monthly reminder from the IRS that you have an ongoing installment agreement. It is crucial to not overlook this notice. Understanding why you receive the CP 521 notice and what are your responsibilities upon receiving it can save you from unnecessary penalties and ensure a smooth compliance with your tax requirements. This article explores the important aspects of the CP 521 Notice.

Understanding the CP 521 Notice

The CP 521 Notice primarily serves as a monthly reminder of your installment agreement with the IRS. This agreement allows taxpayers who cannot pay their tax liability in full to pay it over time. Each notice includes the total balance you owe, any penalties or interest you have incurred since your last installment, your minimum monthly payment, and your payment due date. It also provides details of the terms of the installment agreement.

Your Responsibilities Upon Receiving the CP 521 Notice

Upon receipt of the CP 521 Notice, you should firstly verify the information in the notice. Confirm that your payments have been properly credited, and the remaining balance aligns with your records. After verifying, it’s important to make your next installment payment by the due date to avoid any penalties.

Possible Issues With the CP 521 Notice

There are various issues that might arise with your CP 521 Notice. The most common issue is that your payments may not have been correctly credited, resulting in an incorrect balance displayed in the notice. Another common issue is missing or incorrect information on the notice.

Frequently Asked Questions about the CP 521 Notice

What Happens If I Miss a Payment?

If you miss a payment on your installment agreement, it could end up in termination of the agreement, after which the IRS can enforce severe collection actions against you. Therefore, it’s important to make sure you meet the payment deadline.

What Should I Do If I Cannot Afford the Monthly Installment?

If financial circumstances prevent you from being able to make your scheduled monthly payment, it’s crucial to immediately contact the IRS. They may be willing to reevaluate the terms of your agreement based on your current means.

What Should I Do If I Disagree with the Information on the CP 521 Notice?

If you disagree with the information on your CP 521 Notice, you should contact the IRS immediately to resolve any discrepancies. Keep your records and calculations ready to dispute the information.


The CP 521 Notice serves as a critical reminder for maintaining your installment agreement with the IRS. It is essential to carefully observe this notice, verify the included information, and make your scheduled payments on time. If any discrepancies or financial issues arise, reaching out to the IRS as soon as possible can help clarify matters and potentially modify your agreement terms, enabling you to stay compliant with your tax obligations and avoid any penalties.