What the notice means
The IRS notice page describes the CP501 as a reminder: “You received this notice because we haven't received your payment or a response to the previous notice requesting you pay this balance.” The previous notice is usually the CP14. The balance is assessed; the CP501 adds accrued interest and penalties to the amount due and repeats the demand.
It does not satisfy the levy notice requirements in IRC 6331(d) or IRC 6330. Those come with the CP504 and the LT11 or Letter 1058. A CP501 is a warning that the account is moving, not a levy threat in itself.
Why the client got it
The taxpayer did not pay the first bill, did not set up a payment arrangement, and did not contact the IRS. In the notice sequence IRM 5.2.4 lists for individual accounts, a first notice (Status 21) is followed by a second notice (Status 20, IMF only), a third (Status 56) and a fourth (Status 58). Publication 594 describes the same idea from the taxpayer's side: if the first bill is not paid, “we will send you at least one more bill.”
Common causes when the client says they did respond: a payment applied to the wrong year or SSN, an installment agreement request that was never processed, or correspondence still in the IRS backlog. The transcript usually shows which.
Deadlines and what happens if they pass
The CP501 gives a due date for payment. Missing it does not by itself authorize a levy. The IRS page lists what can happen: the IRS “can file a notice of federal tax lien,” interest accrues and additional penalties may apply. The statutory lien already exists once the first bill went unpaid (IRM 5.11.1.3.2); a filed Notice of Federal Tax Lien makes it public and comes with its own Letter 3172 CDP notice. See federal tax liens.
| Charge | How it runs | Where to read more |
|---|---|---|
| Interest | Charged on underpayments until paid in full (IRS CP501 page) | Penalty and interest calculator |
| Failure to pay penalty | Continues on unpaid tax; the IRS page says it may be removed in some situations if the taxpayer contacts the IRS by the due date | Failure to pay penalty |
How to respond
- Pull the account transcript to confirm the balance and see whether payments or a pending agreement posted. See reading an account transcript.
- If the client disagrees with the balance, the IRS page says to “call us immediately at the toll-free number shown on your notice” with supporting paperwork such as cancelled checks or an amended return.
- If the client can pay, pay with the notice stub or online. Include the bottom part of the notice with a mailed payment so it is credited correctly (IRS page).
- If the client cannot pay in full, apply for a payment plan online or mail Form 9465, as the IRS page describes. See installment agreements.
- If the client needs penalty relief, raise it now. The IRS page says that contacting the IRS by the due date may allow removal of the failure to pay penalty depending on the situation. See first time abate.
- If you represent the client, make sure a Form 2848 is on file so you receive copies and can call. See CAF numbers.
What the IRS does next
If nothing happens, the next notice is the CP503, then the CP504. The IRS page for the CP501 also mentions the right to “Request an appeal under the Collection Appeals Program (CAP) before collection action takes place by following the instructions on your notice.” Publication 1660 lists CAP as available before or after a lien filing or levy and for installment agreement rejections, terminations and modifications, with the limitation that the taxpayer cannot go to court after a CAP decision. See the Collection Appeals Program.
Related notices
- CP14: the first bill.
- CP503: the second reminder.
- CP504: the notice of intent to levy under IRC 6331(d).
Questions practitioners ask
Can the IRS levy after a CP501?
Not on the strength of the CP501 alone. A levy generally requires the IRC 6331(d) notice of intent to levy and the IRC 6330 notice of the right to a CDP hearing, given at least 30 days before the levy (IRM 5.11.1.3.2). Those come later in the stream.
Will a lien be filed?
The IRS page says the IRS can file a Notice of Federal Tax Lien if the balance is not paid or arranged. Filing decisions follow the lien procedures in IRM 5.12; see federal tax liens.
The client already set up a payment plan. Why the CP501?
Pending or recent arrangements can cross with notices. Check the transcript; the CP71 page notes payments can take up to 21 days to post. Call to confirm the account reflects the arrangement.
Is CAP available at this stage?
The IRS CP501 page says CAP can be requested before collection action takes place by following the notice instructions. Publication 1660 describes the program.
Does the CP501 change the penalty rate?
No. Under IRC 6651(d) the failure to pay rate rises from 0.5 percent to 1 percent per month only after the day 10 days after the IRC 6331(d) notice of intent to levy (the CP504) or a notice and demand for immediate payment. Reminder notices do not trigger it.
What should we send if the client disagrees?
The IRS page says to call the toll-free number on the notice immediately and have supporting paperwork, such as cancelled checks or an amended return, ready for the call.