A CP501 is the IRS’s first reminder that a balance from a prior notice remains unpaid. Nothing new has been assessed and no enforcement has started — it is the second rung of the collection ladder, after the CP14 bill you already received.
By Sam Brotman, JD, LLM, MBA · Last updated August 2026
Your deadline
The notice shows a pay-by date, typically 21 days out. There is no new legal event here — interest and the failure-to-pay penalty simply keep running while the balance ages.
What happens if you ignore it
A CP503 reminder follows, then a CP504 Notice of Intent to Levy. The IRS is a patient creditor with a ten-year collection statute (IRC § 6502) — ignoring the reminders does not make the file go away; it moves it toward enforcement.
Your options
Every resolution path is still open at this stage: full payment, an installment agreement, currently-not-collectible status, or an Offer in Compromise if the numbers support one. The reminder stage is also when penalty abatement is worth evaluating — first-time abatement can remove the failure-to-pay penalty entirely if your prior three years are clean.
What we do
We verify the balance against your transcripts, evaluate abatement, and set the resolution path before the file escalates. A case resolved at the CP501 stage costs a fraction of one resolved after a levy.
Holding this notice now? Book a free 15-minute call or call (619) 378-3138. We will tell you exactly where you are in the collection process and what your options are before you spend anything. Our IRS collections attorney team handles these matters statewide.