An IRS balance-due letter is rarely the only one. Most people receive a series, and the letter in your hand decides which rights you have and which deadline is real. This guide puts the notices in order, shows what each one lets the IRS do, and puts a price on waiting using a worked $5,000 example.

It covers balances on a return you filed. For a notice that says income on your return does not match, see what a CP2000 notice is; a CP2000 is a proposal, not a bill.

The sequence at a glance

StepNoticeWhat the IRS says it isMain deadline on the letterWhat the IRS can do next
1CP14First bill: tax, penalties and interest owedPay within 21 days of the notice dateSend reminder notices
2CP501Reminder that a balance is still unpaidPay promptlySend a second reminder
3CP503Second reminderPay promptlySend a Notice of Intent to Levy
4CP504Notice of Intent to Levy (IRC 6331(d))30 days from the notice dateLevy a state tax refund; file a federal tax lien notice; start looking for other assets
5LT11 or Letter 1058Final notice of intent to levy and notice of your right to a hearing30 days to request a Collection Due Process hearingLevy wages, bank accounts and Social Security payments

The IRS does not promise to send every notice in this order, and some accounts skip steps. Treat the table as a map, then check the notice number printed on your letter. Our decoders for each step: CP14, CP504, LT11.

Why the notice number matters more than the amount

Three differences trip people up:

  1. CP504 does not let the IRS take your paycheck or bank balance. The IRS’s own Collection Due Process FAQ states that it cannot levy with just that notice. What CP504 does open up is a state tax refund levy, and it is the point where the IRS starts looking for other assets.
  2. The two appeal forms belong to different letters. CP504 describes a Collection Appeals Program request (Form 9423). The Collection Due Process hearing (Form 12153) belongs to LT11 or Letter 1058. Using the wrong form on the wrong notice is a common, avoidable mistake.
  3. The 10-day penalty jump starts at the levy notice, not at the final notice. The CP504 letter says that if you do not pay within 10 days of its date, the failure-to-pay penalty rises from 0.5% to 1% per month.

What delay costs: a worked example

Assume you owe $5,000 in tax on a return filed on time and cannot pay. The table uses the current IRS underpayment interest rate of 7% a year, compounded daily (announced for the fourth quarter of 2026 in Revenue Ruling 2026-15), the failure-to-pay penalty of 0.5% a month, 1% a month after a levy notice, and the 25% cap. It assumes the levy notice arrives in month 6.

Months unpaidPenalty addedInterest addedTotal added to $5,000
3$75$89$164
6$175$181$356
12$475$378$853
24$1,075$826$1,901

Now compare a payment plan started in month 2 at $250 a month, with the penalty falling to 0.25% a month once the plan is approved:

MonthsPenalty addedInterest addedTotal addedTax still owed
12$147$303$450$2,500
24$181$421$602$0 (paid off about month 22)

How to read this: by month 24, waiting adds roughly $1,900 on a $5,000 bill, while a plan started early adds roughly $600. The plan costs a setup fee on top, which the IRS lists as $29 online with direct debit and $69 online with other payment methods; it is waived for low-income direct debit applicants.

Method and limits. This is our own simplified model, not an IRS calculation. It applies the rates monthly, charges interest on tax plus accumulated penalty, ignores the date each penalty starts earning interest, and holds the 7% rate constant even though the IRS resets it every quarter. Use it to see the shape of the cost; the IRS calls (listed on the notice) give exact figures.

What changes for people who live on Social Security

Retirees face three situations that general tax guides skip.

The 15% levy. After a final notice, the Federal Payment Levy Program can take up to 15% of each monthly Social Security payment automatically. On a $2,000 benefit that is up to $300 a month. A payment plan or hardship request made before that point is the practical way to avoid it.

The IRA trap. Paying a tax bill with a traditional IRA withdrawal is income too. A $5,000 withdrawal can make more of your Social Security taxable that year, and it counts in the income figure Medicare uses for IRMAA surcharges two years later. A payment plan can cost less than a lump-sum withdrawal that pushes you into a higher Medicare bracket. Run both numbers with the Medicare IRMAA calculator before withdrawing.

Hardship status. If paying anything would stop you covering basic living costs, ask the IRS about “currently not collectible” status. Interest and penalties usually continue to build while a balance is in that status, and the IRS generally has 10 years from assessment to collect (IRC 6502), so it pauses the problem rather than ending it.

A short call checklist

Most notices say to call before the date printed on the letter. Have these ready:

  • The notice itself, with the notice number, notice date and tax year
  • Your Social Security number and the filing status on that return
  • Proof of any payment you already made, with the date and method
  • Your monthly income and essential expenses, if you may ask for a payment plan or hardship status
  • A pen: write down the date, the representative’s ID number and what was agreed

If you think the balance is wrong, say so on the call and ask what the IRS needs to review it. If you already paid or set up a plan, call anyway so the account is updated.

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