CP501 Notice — Reminder That Your IRS Balance Is Still Due

Direct answer

CP501 is a reminder notice that your IRS balance is still unpaid. It restates what you owe and warns that collection can escalate if you do not pay, respond, or set up a payment arrangement.

CP501 usually arrives after CP14 when the balance was not paid or resolved. It is not a levy notice yet — but it is later in the reminder chain and time-sensitive.

Reviewed August 2026 · Joseph Lancaster, Founder · About the author

Time-sensitive notice · Back to notices index

What CP501 means

The IRS sent an earlier balance-due notice (often CP14) and the account still shows an unpaid balance. CP501 reminds you of the amount due — tax, penalties, and interest to the notice date — and asks you to pay or contact the IRS.

CP501 vs CP503

  • CP501 is typically the first reminder after CP14.
  • CP503 is a later reminder if the balance remains unpaid — stronger language, same underlying balance.
  • Both are balance-due notices, not levy threats. See our CP503 guide for the second reminder.

Verify on your account transcript

  • Confirm the balance matches what posted — payments or credits may have landed after an earlier notice.
  • Look for transaction codes showing penalties and interest (for example TC 276, TC 196).
  • Check whether an installment agreement or other collection status is already on the account.
  • See our account transcript guide and transcript codes guide for how to read the posting sequence.

What to do next

  • If you can pay in full, pay by the due date on the notice and keep proof of payment.
  • If you cannot pay in full, contact the IRS or apply for an installment agreement before reminders escalate.
  • If you disagree, respond with documentation — do not ignore the notice hoping it goes away.

What happens if you ignore CP501

Unpaid balances typically receive additional reminders (CP503) and may eventually move to intent-to-levy notices if still unresolved. Addressing CP501 is cheaper than waiting for collection enforcement.

Related IRS notices

Verify on your IRS transcripts

Notices describe what the IRS intends to do — your account transcript shows what actually posted. Start here:

Common questions

Is CP501 the same as CP14?

No. CP14 is usually the first balance-due notice after your return is processed. CP501 is a later reminder when that balance remains unpaid.

Can the IRS levy after CP501?

Not immediately from CP501 alone. Levy threats generally follow later notices in the collection sequence (for example CP504 or LT11) if the balance stays unpaid.

Should I pay the exact amount on CP501?

Usually yes, but verify on your account transcript first. Interest accrues daily, so the live balance may differ slightly from the notice date.

How do I read my account transcript for CP501?

Start with our account transcript explained guide, then use the transcript codes guide to decode balance and penalty lines.

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