CP523 Notice: A Free Survival Guide Before Your Installment Agreement Terminates

If the IRS sent you Notice CP523, CP523 (SP), or CP623, your installment agreement is in default and the IRS has told you it intends to terminate it and may levy. There is a window to respond, and what you do inside it depends on why the agreement defaulted.

What this free guide covers

• What a CP523 notice actually means, in plain English.
• The legal grounds the IRS uses to default or terminate an installment agreement (IRC sec. 6159 and 26 CFR 301.6159-1).
• A six-step response checklist: read the notice, reconcile your payment history, check for a new unpaid balance, decide whether to cure, revise, or appeal, build a short response packet, and keep a contact log.
• A worked example of a missed-payment CP523 and how the response changes when a new tax balance is also involved.
• The levy restriction after termination and the Collection Appeals Program option (Form 9423).

Who it is for

Taxpayers who received CP523, CP523 (SP), or CP623 after missing an IRS installment agreement requirement, and who want to understand their options before the termination date.

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Where are you in the process?Select one (optional)I just received CP523The termination date is closeThe agreement was already terminatedI am helping a family member

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This guide is for information only. It is not legal or tax advice, it does not create a client relationship, and no specific outcome is guaranteed.

Want a second set of eyes on your CP523?

Noah Green, CPA, CFE, handles IRS collection and tax-resolution matters with a no-guarantee posture: document the facts, apply the governing rules, and pursue the available procedure. Use the Sheepdog Tax Resolution contact form to reach out.

Prepared by Noah Green, CPA, CFE