IRS Notice CP523
Intent to Default Installment Agreement
The IRS is about to terminate your installment agreement because you missed payments or didn't file required returns.
Tax Attorney · Villanova University School of Law · Admitted in Delaware, New Jersey, United States Tax Court
Notice CP523 in Plain English
CP523 is a warning that your existing installment agreement is about to be terminated. Once terminated, the full remaining balance becomes due and the collection sequence — up to and including levies — restarts.
Why the IRS sent you a CP523
One or more monthly payments were missed or bounced.
A currently required return wasn't filed on time.
A new tax year balance was assessed and not added to the existing agreement.
The IRS received third-party income data (a 1099 or W-2) that pushed you into a new balance.
What Happens If You Ignore Notice CP523
Your agreement will be terminated and the full balance becomes due immediately. Collection actions may resume.
Every day you wait, penalties compound, interest accrues, and your options shrink. The IRS does not negotiate well with silence — they escalate.
What To Do About Notice CP523
Contact us immediately to reinstate your agreement or negotiate new terms before it's terminated.
- 1
Call within the 30-day window — reinstatement inside the window is roughly 3x more likely than after termination.
- 2
Cure the missed payment first if possible; then request reinstatement in writing referencing the CP523 date.
- 3
If a new year's balance triggered the notice, request an add-on that folds the new year into the existing agreement.
- 4
If the missed payment reflects a real change in financial condition, restructure the agreement at a lower monthly amount with Form 433-F documentation.
A Senior Tax Attorney's Take on CP523
CP523 is one of the few notices where a phone call actually beats a letter. Reinstatement decisions live with a specific ACS unit, and a same-day call with the missed payment already made resolves most CP523s inside 15 minutes.
Call (877) 829-5267Costly Mistakes People Make With Notice CP523
Making the missed payment but not calling the IRS to confirm reinstatement — payments alone do not reinstate an agreement.
Ignoring CP523 because 'the payments will resume next month' — the agreement can terminate before that next payment posts.
Setting up a new agreement online after termination at terms worse than the original — the original often can be reinstated.
IRS Notices Related to CP523
These are the notices the IRS most often sends before, after, or alongside a CP523. Read the related ones to understand where you are in the collection sequence.
Tax Resolution Services That Resolve a CP523
Senior tax attorneys at McCauley Law Offices use these strategies to stop, settle, or unwind a CP523 notice.
Set up manageable monthly payment plans to pay off your tax debt over time.
Settle your tax debt for less than what you owe through IRS settlement programs.
Prove financial hardship to temporarily halt IRS collection activity.
IRS Forms You May Need to File for CP523
Primary Sources & Authority
We cite the underlying IRS publications and statutes so you can verify everything on this page.