Early in the collection sequence
IRS Notice CP501: What It Means and What to Do
A reminder that you still have an unpaid balance on one of your tax accounts.
What this notice is
CP501 is a reminder that a balance is still outstanding on one of your tax accounts. It follows the CP14 and precedes the harder notices.
The deadline
The date shown on the notice.
What happens if nothing is done
Continued non-payment leads to CP503, then to CP504 — the Notice of Intent to Levy — and eventually to a final notice carrying appeal rights.
Your options
- Pay the balance in full to stop interest and penalties accruing.
- Apply for a payment plan online — the fastest route to an approved installment agreement.
- Contact the IRS if you believe the balance is wrong.
The part people get wrong
This is the cheapest point in the sequence to act. Nothing has been filed publicly against you yet, and no lien or levy right has attached.
Where this notice sits
The IRS collection sequence runs roughly in this order. Notices can arrive out of order or be skipped, so treat this as the shape of the process, not a timetable.
- 1CP14The first bill. The IRS says you owe money on unpaid taxes.
- 2CP501 — you are hereA reminder that you still have an unpaid balance on one of your tax accounts.
- 3CP503The second reminder. The IRS has still not heard from you.
- 4CP504Notice of Intent to Levy. The tone of the sequence changes here.
- 5CP523Your installment agreement is about to be terminated.
- 6LT11 / Letter 1058The final notice before seizure — and the one with a 30-day clock on your appeal right.
- 7CP90Final notice of intent to levy, with notice of your right to a hearing.
- 8CP508CYour tax debt has been certified as seriously delinquent — and the State Department has been told.
Two notices sit outside this sequence: CP2000 proposes a change and is not a bill, and CP49 reports that a refund was already applied to a debt.
Every statement on this page comes from the IRS's own page for this notice, read on 2026-09-01. Where the IRS does not state something — a fixed number of days, for instance — this page does not state it either.
If you owe the money
Interest runs at 7% a year, compounded daily, and the failure-to-pay penalty adds 0.5% of the unpaid tax for each month or part of a month. An approved payment plan halves that penalty to 0.25%. On a $10,000 balance carried for a year the difference is $300 — for a step that costs nothing today.
IRS Fresh Start
Payment plans and what they change
Penalty Abatement
When the IRS removes penalties
Tax Debt Forgiveness
What is real and what is marketing
Currently Not Collectible
When you genuinely cannot pay
When Collection Rights Expire
The ten-year clock
Wage Garnishment Calculator
What a levy leaves you
Other IRS notices
CP14
The first bill. The IRS says you owe money on unpaid taxes.
CP503
The second reminder. The IRS has still not heard from you.
CP504
Notice of Intent to Levy. The tone of the sequence changes here.
LT11 / Letter 1058
The final notice before seizure — and the one with a 30-day clock on your appeal right.
CP90
Final notice of intent to levy, with notice of your right to a hearing.
CP523
Your installment agreement is about to be terminated.
CP508C
Your tax debt has been certified as seriously delinquent — and the State Department has been told.
CP49
Your refund was used to pay a tax debt.
CP2000
Not a bill. The income reported to the IRS does not match your return.
This page is for general information only and is not tax or legal advice. Settlement Insight is not a law firm, is not a tax representative and does not represent any party. Consult a licensed tax professional or attorney about your specific notice.