When the Failure-to-Pay Penalty Rises to 1% Per Month: IRC 6651(d)

The IRS has a built-in accelerator for unpaid balances. It is the notice of intent to levy. Most people think of that notice as a threat about bank accounts and wages. It is also a pricing change. Ten days after it is given, the failure-to-pay penalty starts running at double speed.

The statute

IRC 6651(d)(1) says that for each month (or fraction of a month) beginning after a described day, the failure-to-pay rates in IRC 6651(a)(2) and (a)(3) are applied by substituting 1 percent for 0.5 percent. IRC 6651(d)(2) defines that day as the earlier of:

• the day 10 days after the date notice is given under IRC 6331(d), the notice of intent to levy, or
• the day on which notice and demand for immediate payment is given under the last sentence of IRC 6331(a), which is the jeopardy situation.

The 25 percent aggregate cap does not change. The rate just gets you there twice as fast.

Which notices count

IRM 20.1.2.3.8.1.1 lists what the IRS treats as a notice of intent to levy for this purpose:

• CP 504, Final Notice, Notice of Intent to Levy Certain Assets (shown on the account as Master File status 58).
• A Collection Due Process notification (transaction code 971, action code 069).
• ACS letter LT11 or field collection Letter 1058 (transaction code 971, action code 035).
• Certain service center assessments that build in a notice of intent to levy.

Your account transcript shows these codes with dates. That date is the starting line for the 10-day count.

Finding the first 1% month

Here is the detail that trips people up. The higher rate does not apply to the month in progress when the notice goes out. It applies to penalty months that begin after the trigger day. Penalty months keep their original rhythm, which is set by the payment due date.

The IRM gives an example: a balance due April 15, a status 58 notice dated July 10, so the trigger day is July 20. Penalty months begin on the 16th. The month that began July 16 started before July 20, so it stays at 0.5 percent. The first month at 1 percent is the one beginning August 16.

Worked example: CP 504 in September

You filed your 2025 return on time and showed $10,000 due on April 15, 2026. You paid nothing. A CP 504 notice of intent to levy is dated September 8, 2026. The trigger day is September 18. The penalty month beginning September 16 started before that, so it stays at 0.5 percent. The month beginning October 16, 2026 is the first at 1 percent.

The penalty hits the $2,500 cap in month 28, the month beginning July 16, 2028. Without the levy notice, at 0.5 percent the whole way, the cap would not arrive until month 50, the month beginning May 16, 2030.

Partial payments still help, at the higher rate

The 1 percent rate is charged on the unpaid tax at the start of each month, just like the standard rate. A $4,000 payment that goes in before the month beginning January 16, 2027 cuts each later monthly charge from $100 to $60. At the higher rate, every dollar paid saves twice as much penalty per month as it would have before.

Interaction with installment agreements

The two special rates pull in opposite directions, so the IRM sets an order of operations. Under IRM 20.1.2.3.8.1.1, the 1 percent rate applies to every month after the trigger, except months where the taxpayer qualifies for the 0.25 percent installment agreement rate under IRC 6651(h). See the 0.25 percent guide.

It works the other way too. IRM 20.1.2.3.8.1.2 treats an installment agreement as terminated 10 days after a notice of intent to levy. If an agreement defaults and a levy notice follows, the reduced rate ends and the 1 percent rate takes over.

A clean slate for new balances

The higher rate does not follow you forever. IRM 20.1.2.3.8.1.1 says the 1 percent rate does not apply to new assessments after the module balance, including accruals, has been paid to zero, unless a new levy notice raises it again. Pay a year off and a later deficiency on that same year starts back at 0.5 percent.

Why the notice matters beyond the penalty

Under IRC 6331(d), the notice of intent to levy must be given at least 30 days before the IRS levies. If the notice is also your Collection Due Process notice, you have 30 days to request a hearing. That hearing suspends levy action and the collection statute while it is pending; see CDP hearings and the CSED. The 10-day penalty trigger and the 30-day hearing window run from the same notice, on different clocks.

For what the levy itself does to bank accounts, see IRS Bank Levy Release.

Checking your account

1. Find the earliest notice of intent to levy on the transcript (status 58 or TC 971 with AC 035 or 069) and its date.
2. Add 10 days to get the trigger day.
3. List penalty months from the payment due date. Mark every month that begins after the trigger day as 1 percent, unless a qualifying installment agreement was in effect that month.
4. Multiply each month's rate by the unpaid tax at the start of that month and stop at 25 percent of the tax.

Worked example: paying down after the notice

Take the $10,000 balance from the CP 504 example, where the 1 percent rate starts with the penalty month beginning October 16, 2026. Suppose the taxpayer pays $6,000 on November 10, 2026. That payment lands in the month that began October 16, so that month is still charged on $10,000, at $100. Starting with the month beginning November 16, the base is $4,000, and each month costs $40 instead of $100.

The higher rate makes every payment worth more. Before the notice, $6,000 paid down saved $30 a month in penalty. After it, the same $6,000 saves $60 a month. If the taxpayer cannot pay the rest, an installment agreement in effect would cut the rate on the remaining $4,000 to 0.25 percent for a timely filer, or $10 a month. The same balance, three different monthly charges: $40, $20, or $10, depending entirely on procedure.

Jeopardy demands

The second trigger in IRC 6651(d)(2) is rarer but more abrupt. When the IRS finds that collection is in jeopardy and makes notice and demand for immediate payment under the last sentence of IRC 6331(a), the 1 percent rate applies to penalty months beginning after the day of that demand, with no 10-day wait. Jeopardy situations are unusual and usually involve facts suggesting assets may be moved or hidden. If one arises, the penalty rate is the least of the concerns, but it is still part of the math: the cap is reached in roughly half the time.

The practical takeaway is timing. The 10-day window after a levy notice is short. A payment arrangement or full payment inside that window can keep the standard rate in place for every month that follows.

The bottom line

A notice of intent to levy is a bill for a higher penalty rate, payable starting with the next penalty month that begins 10 days later. You cannot undo the months already charged at 1 percent, but you can stop new ones by getting into a qualifying payment arrangement or paying the balance. If you have a CP 504 or LT11 on the table, the math says act now, and have someone look at the whole account before you do.