What is a CP523 notice? Intent to terminate your installment agreement

The short version

A CP523 is the notice the IRS sends when it intends to terminate your installment agreement (payment plan) because it believes you defaulted — and it states that if you do nothing, the IRS intends to end the agreement and pursue collection of the full balance, which can include levying your wages, bank accounts, and other assets.

The response window is 30 days from the date of the notice: the IRS's own CP523 guidance says you should contact them as soon as possible and no later than 30 days from the notice date. Your printed notice shows the exact termination date — that date is authoritative.

Why on-time payers get CP523s anyway

The most painful version of this notice arrives when you did pay. IRS payments post to your oldest outstanding tax year first (and within a year: tax, then penalty, then interest). If your agreement covers multiple years, a full payment can feed the oldest year while newer years show missed payments — and the system issues a CP523 for those years even though you paid on time and in the agreed amount.

Married couples are hit disproportionately: with several tax years between spouses, household payments concentrate on the oldest year (often one spouse's), leaving the other spouse's years technically unpaid. People report receiving more than a dozen CP523 notices at once — one per defaulted year.

What to do in the next 30 days

• Make the missing payment(s) before the termination date printed on the notice — this prevents termination.
• Call the number printed at the top right corner of your notice (800-829-0922 is the number printed on most balance-due/CP523 notices — confirm yours) and ask: which years are in default, how were payments applied, the exact cure amount and date, and any reinstatement fee.
• Send a written reinstatement request to preserve the record — phone lines are frequently unavailable.
• If payments were misapplied, request a review of payment application in writing.
• If you disagree with the termination itself, you can appeal to the IRS Independent Office of Appeals (the CAP path, Form 9423).

Passport and other warnings on the notice

CP523 notices include the FAST Act warning: seriously delinquent tax debt can be reported to the State Department, which can deny or revoke your passport. This is one more reason to act inside the window — curing the default (or getting the agreement reinstated) addresses the delinquency.

Sources & confidence

Rule as of 2026-09. The 30-day window and notice content are verified against the IRS CP523 page (reviewed 2026-04-04): https://www.irs.gov/individuals/understanding-your-cp523-notice. Payment-application order is widely documented practice (confidence: medium) — verify against your own account transcripts. Nothing here is tax advice; CP523 Rescue does not guarantee any outcome.