Your Installment Agreement Is Being Terminated.
Default Restores Full IRS Levy Authority.

The CP523 is a termination notice for your installment agreement. It's issued when you've missed a required payment, filed a new balance that wasn't added to the agreement, or otherwise violated the terms. The IRS is giving you a short window — typically 30 days — to cure the default before they cancel the agreement.

Here's what makes this notice uniquely dangerous: your installment agreement was functioning as a levy shield. As long as it was active and current, the IRS could not garnish your wages or levy your bank accounts. The moment it terminates, that protection disappears — and the IRS does not have to restart the notice sequence. They can move directly to enforcement because you've already received all required prior notices.

This is recoverable. Defaulted installment agreements can often be reinstated — especially if it was a first default — through IRS Form 9465 or direct contact with ACS. But the window to cure the default is short, and it closes the moment the termination executes.

The CP523 is issued when you have defaulted on an existing installment agreement. The immediate financial consequence is that your installment agreement is terminated — meaning the reduced 0.25% monthly Failure-to-Pay penalty rate that applied while the agreement was active reverts to the standard 0.5% rate. This penalty increase is automatic and retroactive to the date of default.

More significantly, the CP523 starts a 30-day clock after which the IRS can issue a levy without further warning. This is because you previously waived your right to a Collection Due Process hearing as a condition of the installment agreement — a standard clause most taxpayers don't realize they agreed to. The remaining protections are limited: you can request reinstatement, or you can appeal the termination through the IRS Collection Appeals Program (CAP), but the window is short.

The balance on the CP523 reflects the full remaining liability — all taxes, penalties, and interest — not just the missed payments. That full balance is now due immediately unless the agreement is reinstated or a new resolution arrangement is established within the 30-day window.

Installment agreements can default for several reasons beyond missing a payment: failing to file a return on time while the agreement is active, incurring a new balance from a subsequent year, or providing false financial information when the agreement was established. Each of these is a separate default trigger. The IRS monitors compliance through its systems and issues the CP523 automatically when any trigger is detected.

The reinstatement process is real but not guaranteed. The IRS can reinstate a defaulted installment agreement, particularly if the default was a one-time event and the taxpayer has an otherwise clean compliance history. The request must be made quickly — before the 30-day window closes. The IRS will typically require that the missed payments be brought current and may require updated financial information.

If reinstatement is not granted or not sought, a new installment agreement can be established — but the terms may be different from the original. Large balances may require a formal Collection Information Statement (Form 433-A or 433-F) rather than the streamlined agreement process. This financial disclosure gives the IRS visibility into your income, assets, and expenses — and is the basis for any resolution arrangement going forward.