IRS CP501 / CP503 Notice: Balance Due Reminders
CP501 and CP503 are escalating reminder bills for an unpaid tax balance — CP501 is the first reminder after a CP14, and CP503 means the IRS still hasn't heard from you and the next step is the CP504 intent-to-levy notice.
Deadline calculator
The CP501 / CP503 clock runs from the date printed on the notice — not the day you opened it.
Estimate only, based on the standard 21-day CP501 / CP503 window. Your notice controls — always use the specific date printed on it.
What a CP501 / CP503 actually means
These are the middle letters of the collection sequence. Nothing dramatic happens on the day you get one, but each letter is a step closer to enforced collection, and penalties and interest compound the balance monthly.
The window where resolution is easy — online payment plans, penalty abatement, simple corrections — is exactly now, before the CP504 and LT11 raise the stakes.
What to do, step by step
- 1Confirm the balance is real and correct.
- 2Pay in full if you can, or open an installment agreement online.
- 3Ask about first-time penalty abatement if you have a clean prior history.
- 4If you genuinely can't pay anything, ask about hardship (Currently Not Collectible) status before the letters escalate.
Common questions
How many notices does the IRS send before a levy?+
Typically: CP14 (bill) → CP501 (reminder) → CP503 (second reminder) → CP504 (intent to levy state refund) → LT11/Letter 1058 (final notice with 30-day appeal right). Then levies can begin.
Received a CP501 / CP503? Get it handled.
Talk to a tax specialist about your notice — free, no pressure, no judgment.