Balance due & the collection ladder
The monthly reminder for your installment agreement: how much you owe, how much to pay this month, and where to send it.
Routine
The monthly reminder for your installment agreement: how much you owe, how much to pay this month, and where to send it.
Why you got it: You're on a payment plan; the IRS sends this every month the plan runs.
Not a default notice and not a warning — unless the amount or the balance looks wrong, in which case it's your early signal.
Your first move: Pay the monthly amount by its due date. If the balance shown doesn't match your records, call before the next cycle — small errors are cheap here and expensive at CP523.
The clock on this letter: Pay each month by the due date printed on the reminder.
The reminder's own due date controls your monthly payment. Miss one and the next notice in this family is CP523 — intent to terminate.
Direct debit avoids the missed-payment failure mode entirely.
Shortens the plan and the interest bill.
Balances that creep instead of shrink usually mean a payment wasn't credited — catch it here.
Pay online or with the voucher in the reminder.
The IRS does not text payment links for CP521. Pay only through IRS.gov or the voucher.
A missed payment defaults the agreement: CP523 follows, then termination, then the levy ladder resumes.
Where this sits on the ladder: CP523 →
One payment. No subscription. Yours to keep — every notice, every letter, every script.