What happens after a missed IRS payment, and how to get back on track

By JT Williamson, editor

Educational information only, not tax, legal, or financial advice. We are not a CPA, enrolled agent, attorney, or the IRS. Talk to your own tax professional about your situation.

Short answer: If you miss a monthly payment on an IRS payment plan, the IRS says the interest and penalties you owe will increase and you could default on the plan (IRS: CP521 notice). If it then sends a CP523, it intends to end the plan and levy your wages or bank accounts, and it asks you to pay before the termination date and contact it no later than 30 days from the notice date (IRS: CP523 notice). Many plans can be revised, or reinstated after default, in the IRS online payment agreement tool, though a reinstatement fee may apply (IRS: online payment agreement). A missed estimated tax payment works differently and is covered further down.

This page is for someone who just missed, or is about to miss, a scheduled IRS payment and wants to know what happens next and what to do this week. It covers which payment you missed, the two notices to know, a first-week checklist, what falling behind costs, what the IRS generally won't do while you act, estimated payments, and how to keep a plan from slipping again. It's education, not tax, legal or financial advice.

First, which payment did you miss?

"Missed a tax payment" can mean different things, and the IRS treats them differently. The middle column is what the linked IRS page says; the last column is our own suggestion.

The two notices to know: CP521 and CP523

CP521 (also CP521 (SP) and CP621) is a reminder that a monthly installment payment is due by a specific date. The IRS says to send your payment immediately and pay by the due date. It asks you to pay the amount shown, and if you mail it, to use the envelope it sent and include the bottom part of the notice so the payment is credited correctly (IRS: CP521).

CP523 (also CP523 (SP) and CP623) is the serious one. The IRS says it means you have defaulted, that it intends to terminate your installment agreement and seize (levy) your assets, and that the notice explains why. What the IRS page tells you to do (IRS: CP523):

• Make your payment before your termination date to prevent the agreement from being terminated.
• Contact the IRS right away, at the number on the notice, to see if you can reinstate the agreement. You may have to pay a fee to reinstate it, or pay any new tax liability in full.
• Contact it as soon as possible, but no later than 30 days from the date of the notice.
• If you've already fixed the problem, still call, so the IRS has a record of it and can reinstate the agreement.

If you don't respond, the IRS says it will terminate the agreement and begin collection action, which can include filing a federal tax lien or levying wages or bank accounts. Our guide to tax liens vs levies explains the difference. The CP523 page also covers passport certification for seriously delinquent tax debt and points to IRS.gov/passports.

What to do in the first week

These steps are our own order of work. The IRS rules inside them are linked where they appear.

1. Find out why it was missed. Check your bank record for the due date: a payment that never went out, a failed direct debit, or a check that bounced each leads to a different fix. Write down the date and amount.
2. Check your IRS account. Your online account shows balances by tax year, up to 5 years of payment history, digital notices, and your payment plan (IRS: online account). A payment you just made may not show yet: the IRS says to allow one to three weeks (three weeks for non-electronic payments) for a recent payment to be credited to your account (IRS: payment plans). If you're not sure what the account shows, our page on what an IRS account transcript can tell you explains how to check.
3. Catch up if you can. If you got a CP523, the IRS says to pay before the termination date. A payment you can actually make now beats a bigger promise you can't keep.
4. If the amount no longer works, revise the plan. The online payment agreement tool lets you change the monthly amount and due date, switch to a direct debit agreement, change the bank account on a direct debit plan, and reinstate after default (IRS: online payment agreement). If the new amount doesn't meet the requirements and you can't make the minimum, the tool gives directions for Form 9465 with Form 433-F, or Form 433-H.
5. If you can't fix it online, the IRS says that if you've received a notice of default and can't make changes online, or you got an urgent notice about a balance due, follow the instructions on the letter and contact it right away (IRS: payment plans). Use the number printed on your notice.
6. Put the dates on your calendar: the termination date and 30 days from the notice date, if you have a CP523, and your next regular due date.
7. Log what you did in the worksheet below: date, what you paid or changed, who you spoke with and any confirmation number.

What falling behind costs

• The failure-to-pay penalty can go up. If you filed on time as an individual, the IRS reduces it to 0.25% per month during an approved payment plan. Without a plan it's 0.5% per month. If you don't pay within 10 days after an IRS notice of intent to levy, it becomes 1% per month (IRS: failure to pay penalty). In every case it won't exceed 25% of the unpaid tax. The IRS applies full monthly charges even if you pay in full before the month ends, and it says to pay what you can now and apply for a payment plan, since setting one up may reduce future penalties.
• Interest and penalties keep accruing until the balance is paid in full, plan or no plan (IRS: payment plans).
• Reinstating may cost a fee. The IRS says there may be a reinstatement fee if your plan goes into default. The same page lists the current fees for revising a plan: they're lower online, may be reimbursed for low-income taxpayers if certain conditions are met, and don't apply to changes on an existing direct debit agreement. See its payment plans page. We don't copy the dollar figures here because they change.
• Refunds go to the debt. While a plan is in place, future refunds are applied to your tax debt until it's paid in full, and the IRS says to make all scheduled payments even if it applies your refund.

If penalties are most of what you owe, our guide to IRS penalty relief covers what you can ask for.

What the IRS generally won't do while you act

The IRS says it will generally not take enforced collection actions while a payment plan is being considered, while a plan is in effect, for 30 days after a request is rejected or terminated, or while it evaluates an appeal of a rejected or terminated agreement (IRS: payment plans). The same page says that when you default and the IRS proposes to end the plan, the running of its collection period is suspended for 30 days.

If you disagree with the termination, the CP523 page says to contact the IRS at the number on the notice first. If you still disagree after that, you have the right to appeal and can request a hearing with the IRS Independent Office of Appeals (IRS: CP523). IRS Publication 594 says that after the IRS rejects, terminates or proposes to terminate a payment plan, you submit a written Installment Agreement Appeal request, preferably on Form 9423, Collection Appeal Request, within the timeframe listed in your notice; a conference with the manager is recommended but not required (IRS Publication 594). Publication 1660, Collection Appeal Rights, listed on the CP523 page, has the details.

If it was an estimated tax payment

The IRS describes the income tax system as pay-as-you-go: you pay during the year through withholding or estimated tax payments, and if you didn't pay enough, you may owe a penalty for underpayment of estimated tax (IRS Topic 306). From the same page:

• Generally, most taxpayers avoid the penalty if they owe less than $1,000 after withholding and refundable credits, or if they paid at least 90% of this year's tax or 100% of the tax shown on last year's return, whichever is smaller. Special rules apply to farmers, fishers, certain household employers and certain higher-income taxpayers.
• If your income comes in unevenly, the annualized installment method may let you vary the payments to avoid or lower the penalty. Form 2210 shows whether you owe it.
• The IRS can waive it if a casualty, disaster or other unusual circumstance kept you from paying and the penalty would be inequitable, or if you retired after age 62 or became disabled that year or the year before and the underpayment was due to reasonable cause, not willful neglect.

Our suggestion: don't skip the next quarter to make up for the missed one. Make the next payment on time and note the missed one for when you file. If business and household money are mixed, start with our guide to self-employed tax debt.

Keeping the plan from slipping again

The IRS's own list for avoiding default (IRS: payment plans):

• Pay at least your minimum monthly payment when it's due.
• File all required tax returns on time and pay all taxes in full and on time. If you can't, contact the IRS to change your agreement.
• If you pay by check, include your name, address, SSN, daytime phone number, tax year and return type, and mail it to the address in your IRS correspondence.
• Confirm your payment date and amount on your recent statement or confirmation letter.
• If you move, tell the IRS or file Form 8822, Change of Address.

Two habits we suggest: if your plan isn't on direct debit, consider switching (the online tool offers it), and set your due date a few days after your paycheck lands. Then rebuild the monthly number with our realistic tax-debt budget so the amount you agree to is one you can keep.

A made-up example

This example is invented to show the method. It isn't a real person or case. Marcus has a monthly IRS payment plan paid by check. In March his hours are cut and he skips a payment. Later, a CP523 arrives. He writes the notice date and the termination date on his calendar, signs in to his online account to confirm which payments posted, and works out with his budget what he can really pay each month. He makes the catch-up payment he can afford before the termination date, uses the online tool to lower the monthly amount and switch to direct debit, and writes the confirmation in his log. He doesn't wait for a second letter, and he doesn't promise an amount he already knows he can't keep.

Free worksheet: missed-payment recovery log

Download the missed-payment recovery log (CSV). It opens in Excel, Google Sheets or Numbers and has one blank row for each thing to pin down: which payment you missed and why, the notice details and dates, what your IRS account shows, what you paid or changed and the confirmation, and your questions. Don't type full Social Security numbers or bank passwords into it.

Questions to bring to a review or call

• Is my plan still active, proposed for termination, or terminated, and as of what date?
• What amount brings the plan current, and by what date?
• Can I reinstate or revise it online, and will a reinstatement fee apply?
• Did a new tax balance cause the default, and does it need to be paid or added?
• If I disagree with the termination, what's the deadline for an appeal on my notice?
• Would direct debit or a different due date make missing a payment less likely?

Your next step

Fill in the recovery log, then act on the earliest date you have. If the plan itself no longer fits, revisit payment plan vs offer in compromise. If the letter mentions a lien or levy, read about wage garnishment language on a notice. For how a payment plan fits into the bigger picture, see the "can't pay" section of our plain-English guide to IRS tax debt, or contact us with questions. For an overview of common tax-resolution topics, see how we help. Please don't email us Social Security numbers, bank passwords or full transcripts.

How this page is made

Every IRS rule on this page paraphrases or quotes an official IRS page linked where it appears: the CP521 and CP523 notice pages, payment plans and installment agreements, the online payment agreement application, the failure to pay penalty page, Topic 306, the online account page, Publication 594 and Publication 1660, checked October 8, 2026 and re-checked October 10, October 13 and October 14, 2026 (Publication 1660 was added on October 13). The "where to look first" column, the first-week order, the two habits, the worksheet and the made-up example are our own and are labeled as such. We left out IRS phone numbers and fee amounts and point to the IRS pages and notices that list them instead, so they stay current. This page doesn't describe any personal experience with the IRS and doesn't predict outcomes.

Keep reading: How to build a realistic tax-debt budget · Offer in Compromise vs installment agreement: decision factors · Penalty abatement basics: what taxpayers often ask · IRS notices and tax debt: a plain-English guide

Educational information only. Not IRS, legal, or accounting advice. No outcome is guaranteed.