Notice CP523 is the IRS notice that an installment agreement is in default and will be terminated, usually for a missed payment, a new unpaid balance, or an unfiled return, with about 30 days to fix the problem before collection resumes.
Reinstatement is usually possible with a fee if the cause is corrected. A terminated agreement means the full balance is due and levies can follow.
Why it matters: a new tax year’s unpaid balance is the most common cause, so the plan has to include current-year estimates. See installment agreement.
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Definitions are general information, not legal advice, and may not reflect the most recent changes in law.
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