If you miss a payment on your IRS installment agreement, the agency will send you a CP523 notice giving you 30 days to catch up before it terminates the agreement and restarts enforced collection. The plan isn’t dead the moment a payment fails to clear. You have a defined window to fix it, and acting inside that window usually restores the original terms without much added cost.
The CP523 Notice and Your 30-Day Window
When a payment is missed, the IRS issues a CP523 notice (or CP523 (SP) or CP623). The notice functions as both a notice of intent to terminate your installment agreement and a notice of intent to levy your assets. It lists what you owe, what triggered the default, and the deadline to respond.
1Internal Revenue Service. Understanding Your CP523 NoticeYou have 30 days from the date on the notice to contact the IRS and resolve the problem. If that deadline passes, the agreement is terminated. At that point the IRS can file a Notice of Federal Tax Lien, levy bank accounts, garnish wages, or seize other assets.
2Internal Revenue Service. IRS Notice CP523 – Notice of Intent to LevyThe 30-day period is set by statute. The one exception: if the IRS believes collection is in jeopardy, it can skip the waiting period entirely.
3Office of the Law Revision Counsel. 26 USC 6159 – Agreements for Payment of Tax Liability in InstallmentsPenalties Climb Once the Agreement Ends
While your installment agreement is active, the failure-to-pay penalty runs at a reduced rate of 0.25% per month on your unpaid balance, assuming you filed on time. Terminate the agreement and that rate doubles to the standard 0.5% per month. If the IRS then issues a notice of intent to levy and you don’t pay within 10 days, it climbs again to 1% per month.
4Internal Revenue Service. Failure to Pay PenaltyInterest continues on top of the penalty. The failure-to-pay penalty caps at 25% of the unpaid tax, but hitting that ceiling still adds a substantial amount to the balance.
5Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest ChargesOn a $20,000 balance, the difference between the installment-agreement rate and the post-levy-notice rate works out to roughly $50 versus $200 a month in penalties alone. That gap is the practical case for moving fast.
How to Reinstate a Defaulted Plan
Reinstatement keeps your original agreement intact, so you resume the same monthly payment on the same schedule. It’s available as long as you act inside the 30-day CP523 window.
To reinstate, you need to do three things:
- Pay every installment you’ve missed since the last successful payment, in a lump sum.
- Pay the reinstatement fee. It’s $10 through your IRS Online Account, or $89 by phone, mail, or in person. Low-income taxpayers pay $43 by phone or mail (or $10 online), and those fees may be reimbursed if certain conditions are met.
- Clear up any related compliance issue. If the default involved an unfiled return or a new unpaid tax bill, that has to be resolved too.
Call the number printed on your CP523 notice, or the IRS individual collections line at 800-829-1040. Confirm the exact amount before sending money. Payments sent without coordinating with a representative can get misapplied to the wrong period or balance, which won’t fix the default.
1Internal Revenue Service. Understanding Your CP523 NoticeOnce the payment and fee clear, the agreement is restored and your regular monthly schedule resumes. Miss the 30-day window and reinstatement is off the table; you’ll need to apply for a new payment plan from scratch.
Change the Plan Before You Miss
If you already know an upcoming payment is going to be a problem, the best move is to change the agreement before the payment fails. Modifying an active plan avoids the CP523, avoids the penalty rate jump, and generally avoids the reinstatement dance altogether.
Through your IRS Online Account, you can:
- Change your monthly payment amount
- Change your payment due date
- Switch to a Direct Debit agreement
- Update your bank routing and account numbers
If your proposed new payment falls below the IRS minimum, the system will prompt you for additional financial disclosure. The restructuring fee matches the reinstatement fee: $10 online, or $89 by phone or mail. That’s cheaper than the penalties, interest, and collection risk that follow a default.
Other Ways You Can Default Without Missing a Payment
A missed installment isn’t the only trigger. Under federal law, the IRS can terminate an installment agreement for any of these reasons:
- You didn’t pay the required installment by the due date.
- You filed a return showing a new balance due and didn’t pay it on time.
- You failed to file a required federal return while the agreement was active.
- The IRS determined your financial situation improved enough to pay more.
- Information you provided when setting up the agreement was inaccurate or incomplete.
- You didn’t respond to an IRS request for updated financial information.
The new-balance trigger catches a lot of people. Owing $200 on this year’s return and not paying it by April 15 can terminate an installment agreement covering tens of thousands in older debt. Ongoing compliance is a condition of the plan, not just making the monthly installment on time.
3Office of the Law Revision Counsel. 26 USC 6159 – Agreements for Payment of Tax Liability in InstallmentsOne related point worth knowing: even while your agreement is in good standing, any tax refund you’re owed is applied to your outstanding balance rather than to your monthly payments. The refund and the installments run on separate tracks. Don’t skip a scheduled payment because a refund landed in your account; the skip will still be treated as a default.
If You Believe the Termination Is Wrong
If you think the IRS terminated your agreement in error, or the reason for the proposed termination is something you can explain, you can appeal through the Collection Appeals Program (CAP) using Form 9423.
7Internal Revenue Service. Form 9423, Collection Appeal RequestSubmit Form 9423 within 30 calendar days to the IRS office or revenue officer who took the action. Don’t send it directly to the IRS Office of Appeals. The IRS recommends first asking for a managerial conference, though it isn’t required.
CAP decisions are relatively quick and binding on both sides. The trade-off: you can’t later take the same issue to Tax Court. A Collection Due Process (CDP) hearing preserves that Tax Court right, but CDP is only available after a final notice of intent to levy or a filed notice of federal tax lien. If you’ve received the CP523 and nothing further, CAP is the path.
8Taxpayer Advocate Service. Collection Due Process (CDP)If the 30-Day Window Has Already Passed
Once reinstatement is unavailable, the two main options are a new installment agreement or Currently Not Collectible status.
A New Installment Agreement
This is a fresh application based on your current finances and total outstanding balance. You can apply using Form 9465 or the IRS Online Payment Agreement tool. For combined tax, penalties, and interest of $50,000 or less, the online application usually gives an immediate approval decision.
9Internal Revenue Service. Online Payment Agreement ApplicationSetup fees as of 2026:
- Direct Debit: $22 online, $107 by phone or mail
- Standard payment plan: $69 online, $178 by phone or mail
- Low-income taxpayers: setup fee waived for Direct Debit; $43 for standard plans (may be reimbursed)
Direct Debit carries the lowest fee and takes the possibility of a forgotten payment off the table. If a missed payment caused the original default, switching to automatic withdrawal is worth considering. While the IRS reviews your new application, it’s generally prohibited from levying your assets, so applying quickly is protective in its own right.
6Internal Revenue Service. Payment Plans; Installment AgreementsCurrently Not Collectible Status
If your finances have deteriorated to where you can’t cover basic living expenses and make any payment toward the tax, you may qualify for Currently Not Collectible (CNC) status. CNC places a hold on IRS collection activity against you.
10Internal Revenue Service. Temporarily Delay the Collection ProcessYou’ll document your finances, typically on Form 433-A (wage earners and self-employed) or Form 433-F. Penalties and interest keep running while you’re in CNC, and the IRS reviews your income each year at filing time. If your income rises above the threshold tied to the reason your account was shelved, the IRS reactivates it and expects you to enter a payment arrangement.
11Internal Revenue Service. IRM 5.16.1 Currently Not CollectibleCNC isn’t debt forgiveness, but it does stop enforced collection while your situation is under water, and it can be the right first step when a new installment agreement isn’t realistic yet.