The IRS charges interest on what you owe, whether you pay in full or set up a plan
Interest on an IRS payment plan is not a separate fee for the plan itself. Instead, the IRS charges interest on your unpaid tax balance from the original due date until you pay it off completely. The interest rate is set by federal law and changes quarterly. For 2024, the rate is 8 percent per year, compounded daily. This means interest accrues on top of your original tax debt and on any interest already added.
When you make monthly payments on a plan, part of each payment goes toward the original tax, part toward accumulated interest, and part toward penalties (if any apply). The longer your plan runs, the more interest you pay overall. A payment plan does not stop interest from building—it only lets you pay what you owe over time instead of in one lump sum.
Key Takeaways
- The IRS charges interest on unpaid taxes at a rate set quarterly by federal law, currently 8 percent per year for 2024, and this rate changes each quarter.
- Interest compounds daily on your unpaid balance, so the longer you carry a debt, the more interest accumulates on top of the original amount owed.
- Monthly payment plan fees range from $31 to $225 depending on the plan type and whether you set up automatic payments, and these are separate from interest charges.
- Paying off your plan faster reduces the total interest you pay, because interest stops accruing once your balance reaches zero.
- The IRS may lower or remove penalties if you have a reasonable cause for late payment, but interest cannot be waived under any circumstance.
How the quarterly interest rate is determined
The IRS interest rate is tied to the federal short-term rate plus 3 percentage points. The IRS announces the new rate at the start of each calendar quarter—January, April, July, and October. The rate applies to all taxpayers and does not vary based on credit score, income, or payment history.
You can find the current rate on the IRS website under "Interest Rates" or ask the IRS directly when you call about your payment plan. The rate has ranged from 3 percent to 9 percent over the past decade, depending on broader economic conditions. Even if rates drop after you set up your plan, your interest continues at the rate in effect when your tax was due, not the current rate.
Setup fees for different payment plan types
The IRS charges a one-time setup fee when you establish a payment plan. This fee is separate from interest and is added to your total balance. The fee depends on which plan you choose and how you pay:
| Plan Type | Setup Fee (Standard Payment) | Setup Fee (Automatic Payments) |
|---|---|---|
| Short-term plan (120 days or less) | $31 | $31 |
| Long-term installment agreement | $225 | $31 |
| Online payment agreement | $225 | $31 |
Setting up automatic payments from your bank account cuts the fee for a long-term plan from $225 to $31. This is the biggest way to reduce the cost of a payment plan beyond paying it off faster. You can change to automatic payments later if you initially set up manual payments, though the IRS may charge a small fee to modify your agreement.
How interest and penalties stack on your monthly payment
When you make a monthly payment on a plan, the IRS applies it in a specific order: first to penalties, then to interest, then to the original tax amount. This means your first several payments may barely touch the principal debt if penalties and interest are large.
For example, if you owe $5,000 in tax with $500 in penalties and $200 in accrued interest, and you pay $150 per month, your first payment covers the entire penalty and part of the interest. Only after penalties are paid does money start reducing the original tax balance. Interest continues to accrue on the unpaid tax and any remaining interest during this time.
This is why paying extra toward principal when you can—even $20 or $50 more per month—significantly reduces the total cost. Every dollar that goes to tax instead of interest is a dollar that stops generating interest charges going forward.
What happens if you miss a payment on your plan
Missing a single payment does not automatically end your plan, but it triggers additional consequences. The IRS may charge a failure-to-pay penalty of 0.5 percent of the unpaid tax for each month the payment is late. Interest continues to accrue on the missed amount, and the IRS may send you a notice demanding immediate payment or threatening to terminate the plan.
If you miss a payment, contact the IRS as soon as possible. You can make up the missed payment, resume your regular schedule, or request a modification to your plan. The IRS generally allows one missed payment before taking action, but a second miss in the same 12-month period usually results in plan termination and a demand for full payment.
Penalties and whether they can be reduced
The IRS typically assesses two types of penalties on unpaid taxes: a failure-to-file penalty (if you did not file a return) and a failure-to-pay penalty (if you filed but did not pay). These penalties are separate from interest and are calculated as a percentage of the unpaid tax.
Unlike interest, penalties can sometimes be removed or reduced if you show reasonable cause—meaning you had a legitimate reason for not paying on time, such as a serious illness, death in the family, or a natural disaster. You must request penalty relief in writing and provide documentation of your circumstances. The IRS reviews these requests but does not grant them automatically.
Interest, however, cannot be waived or reduced under any circumstance. The law does not allow the IRS to forgive interest charges, even if you have a strong reason for the delay. This is why the focus should be on paying down the balance as quickly as possible to minimize how much interest accrues.
Comparing the cost of a payment plan to paying in full
If you have the option to borrow money or use savings to pay your tax debt in full, compare the cost against what you would pay in interest over a payment plan. A payment plan that runs 36 months on a $10,000 debt will cost significantly more in interest than paying the same debt in 12 months.
However, a payment plan may still be the right choice if paying in full would create a financial hardship—such as leaving you unable to pay rent, utilities, or medical expenses. The IRS recognizes this and allows payment plans specifically so people can meet their tax obligation without financial ruin. In that case, the interest cost is the price of spreading the payment over time, and it is worth paying to avoid immediate hardship.
Frequently Asked Questions
Can the IRS lower the interest rate on my payment plan?
No. The interest rate is set by federal law and applies equally to all taxpayers. The IRS cannot lower your rate based on your circumstances, income, or credit score. The rate changes only when the federal short-term rate changes, which happens quarterly.
Does interest stop accruing once I set up a payment plan?
No. Interest continues to accrue daily on your unpaid balance from the original due date until you pay the debt in full. A payment plan does not pause or reduce interest—it only allows you to pay over time instead of in one lump sum.
What is the difference between interest and penalties?
Interest is a charge on unpaid taxes that accrues daily and cannot be waived. Penalties are separate charges for filing or paying late, calculated as a percentage of the unpaid tax. Penalties can sometimes be reduced if you show reasonable cause, but interest cannot.
If I pay extra toward my balance, does it reduce the interest I owe?
Yes. Every dollar you pay toward the original tax balance stops generating interest going forward. Paying extra accelerates how quickly you reduce the principal, which directly lowers your total interest cost. Even small extra payments add up over time.
What happens to my interest if I pay off my plan early?
Interest stops accruing once your balance reaches zero. If you pay off your plan ahead of schedule, you pay less total interest than if you had made only the minimum monthly payments. The IRS does not charge a penalty for early payment.