A CP523 in the mail means your installment agreement is in default — it does not mean it is terminated. The notice starts a 30-day clock, and inside that window most defaults can be cured, often cheaply and sometimes as of right. This page works the procedure in the order you need it: what triggered the default, what the notice actually sets in motion, the reinstatement lanes the Internal Revenue Manual gives you, what it costs, and what happens if you let the clock run out. (The cheapest default is the one that never happens — the payment floor that keeps a plan viable is derived on the minimum payment page.)
General information, not tax or legal advice. Deadlines on a CP523 run from the date printed on the notice, not the date you read it — if your notice is already weeks old, call the IRS first and read second.
An agreement defaults when you:
Termination itself is a separate, later step that requires managerial approval inside the IRS — a missed payment starts the CP523 process; it does not end the agreement on its own.
CP523 is a Notice of Intent to Terminate Your Installment Agreement (variants include CP523(SP), CP623 and CP523F), issued under IRC §6159(b). It proposes termination and warns that levy action can follow. While you are inside the 30-day window — and while a timely appeal is pending — the collection protections of §6331(k) hold: no levy while a plan is in effect, for 30 days after a termination, or during a timely appeal of it. If the default was a new liability, curing may require paying the new balance in full, plus a reinstatement fee.
Here is the rule no notice-explainer prints: an agreement that is in default but not yet terminated must be reinstated once you remedy the default, unless a separate default reason remains. The IRS doesn’t get to refuse a cured, not-yet-terminated agreement. How easily that happens depends on which lane you are in:
| Lane | Conditions | What it takes |
|---|---|---|
| No-analysis reinstatement | Default caused by a new assessed liability whose inclusion adds no more than two monthly payments and doesn’t push the agreement past the collection statute date | No managerial approval, no new financial statement (a lien determination is required) |
| No-analysis reinstatement | The agreement meets Simple Payment Plan criteria and you have not defaulted in the previous 12 months | No managerial approval, no new financial statement |
| Full re-vetting | Everything else — a second default within 12 months, or a large new liability | Financial-statement analysis before reinstatement; the outcome can be a restructured agreement or a partial payment agreement |
Read the second lane carefully: your first default in a 12-month period, on a Simple-plan agreement, reinstates on the simple track. A second one re-opens your finances to full ability-to-pay examination.
| Channel | Fee |
|---|---|
| Reinstate or restructure online (OPA) | $6 |
| Reinstate or restructure — phone, mail, in person | $89 |
| Low-income | $6 online / $43 manual — reimbursable on completion |
| Changes to an existing direct-debit agreement | $0 |
Two stale figures circulate here: the $10 online rate was superseded on July 5, 2026, and the $89 printed on sample CP523 notices is only the manual-channel rate. The full current schedule is on the fees and interest page. You can reinstate through the same online tool you applied with — the menu is covered on the online application page.
A proposed termination can be appealed through the Collection Appeals Program (CAP) to the IRS Independent Office of Appeals. A timely appeal keeps the levy bar in place and suspends the collection statute clock while it is considered. Appeal is also the route when you have already taken corrective action and the notice crossed your fix in the mail — the IRS’s own FAQ contemplates exactly that situation, which is why the call-to-confirm step above matters either way.
One preventive note: the IRS mails an annual statement (CP89) for most agreements precisely so you can catch drift — a growing balance, a payment that no longer covers accruals — before it becomes a CP523. What the annual statement is telling you is covered on the installment agreement page.
This is a different event from a CNC status being reactivated (2.10’s subject): a defaulted agreement is an agreement in trouble; a reactivated CNC account was never an agreement at all.
What do I have to do? / How much time do I have to respond? You have 30 days from the date of the CP523 notice to make arrangements to pay and/or appeal the proposed termination. Within the window, pay the past-due amount or call 800-913-9358 to cure the default. Paying the amount on one notice reinstates all tax periods in the agreement.
What if I don’t agree with your action or have already taken corrective action? Call the number on the notice anyway. The IRS instructs taxpayers who have already fixed the problem to confirm the reinstatement is recorded — the system does not guarantee it registers automatically. If you dispute the default itself, you can appeal the proposed termination through the Collection Appeals Program while the levy bar remains in place.
How do I reinstate my IRS installment agreement after default? Cure the cause (catch up the payment, file the missing return, or address the new balance), then request reinstatement — online through the OPA tool for $6, or by phone/manual channels for $89; low-income fees are reimbursable. Under IRM 5.14.11.5, an agreement in default but not yet terminated must be reinstated once the default is remedied; a first default on a Simple Payment Plan, or one adding no more than two payments, reinstates without a new financial statement.
General tax information, not tax or legal advice. Sources: IRS CP523 notice page (30-day window; 800-913-9358; cure and appeal); IRM 5.14.11.5 and 5.14.11.5.1(3) (must-reinstate rule, no-analysis lanes, per-period notices); IRM 5.14.1.2 (fees; prospective 0.5% restoration); IRC §§6159(b), 6331(k). Currency verified 2026-10-23.