IRS Notice Guide
CP523
CP523 — Installment Agreement Default Notice
HIGH PRIORITY — Respond within 30 days
What This Notice Means
Your installment agreement is in default — either you missed a payment, failed to file a return, or incurred a new balance. The IRS may terminate your agreement.
⏰ Response Deadline: 30 days
Act before this deadline to avoid escalation to levies or liens.
What to Do
- 1
Make the missed payment immediately
- 2
Call the IRS to request reinstatement of your agreement
- 3
File any missing returns that caused the default
- 4
If your agreement is terminated, act fast to get a new one before enforcement begins
Guides That Can Help
IRS Installment Agreement Kit
Set up a monthly IRS payment plan yourself — no attorney needed.
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CDP Collection Due Process Hearing Guide
Use your legal right to halt IRS collection and negotiate.
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IRS Notice Response Bundle (CP2000, CP90, CP2501)
Decode and respond to the IRS's most threatening notices.
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