The IRS charges interest and penalties on unpaid tax debt, and both continue to accrue while you pay through a payment plan

When you set up a payment plan with the IRS, you are not freezing the interest and penalties on what you owe. The failure-to-pay penalty continues at 0.5% of your unpaid tax per month (or part of a month) until the debt is paid in full. On top of that, the IRS charges interest on the entire unpaid balance, compounded daily. The interest rate is set quarterly and is currently in the range of 8% to 9% annually, though it changes. Both the interest and the penalty are added to your balance, so you are paying interest on the interest.

The payment plan itself does not stop these charges—it only lets you spread the tax bill across months or years instead of paying it all at once. The longer your plan runs, the more interest and penalties accumulate on top of your original debt. This is why understanding the total cost of a payment plan matters before you commit to one.

Key Takeaways

  • The IRS charges a failure-to-pay penalty of 0.5% per month on unpaid tax, and this penalty continues throughout your payment plan until the debt is settled.
  • Interest accrues daily on your unpaid balance at a rate set quarterly by the IRS, currently between 8% and 9% annually, and compounds on itself.
  • A payment plan does not reduce or pause interest and penalties—it only spreads your payments over time, so the total cost of what you owe grows as you pay.
  • The IRS offers a short-term extension (up to 180 days) with no setup fee, which can reduce total interest if you can pay within that window.

How the failure-to-pay penalty is calculated

The failure-to-pay penalty is separate from interest and is assessed specifically because you did not pay your tax on time. It accrues at 0.5% of your unpaid tax for each month or partial month that the tax remains unpaid. If you owe $10,000 and you are one month into a payment plan, the penalty has already added $50 to your debt. After six months, it has added $300.

The penalty stops accruing once your account is paid in full, but it does not pause or reduce while you are making payments. The IRS will not waive this penalty unless you can show reasonable cause—for example, a serious illness or death in your family that prevented you from paying on time. Most payment plan situations do not may have access to for a waiver.

How interest compounds on your payment plan

Interest is calculated on your unpaid balance and compounds daily. The IRS sets the interest rate quarterly based on the federal short-term rate plus 3 percentage points. As of early 2024, this rate is approximately 8% to 9% annually, but it changes every three months. You can find the current rate on the IRS website under "Interest Rates."

Because interest compounds daily, the longer your payment plan runs, the more you pay in total interest. A $10,000 debt on a 12-month plan will cost you roughly $400 to $450 in interest alone, depending on the exact quarterly rates during those months. A 60-month plan on the same debt could cost $2,000 or more in interest. The penalty continues to accrue on top of this, making the total cost significantly higher than your original tax bill.

The difference between a short-term extension and a payment plan

The IRS offers two ways to delay payment: a short-term extension and a payment plan. A short-term extension gives you up to 180 days to pay in full with no setup fee. During this time, interest and penalties still accrue, but you are not committing to months of payments. If you can pay the full amount within six months, a short-term extension costs less in total interest than a payment plan.

A payment plan, by contrast, spreads your payments over months or years. The IRS charges a setup fee (currently $31 to $225 depending on how you set it up) and continues to charge interest and penalties for the entire length of the plan. If you cannot pay within 180 days, a payment plan is your only option, but you should understand that the longer the plan, the more interest you will pay.

Setup fees for different types of payment plans

The IRS charges a setup fee when you enter a payment plan, and the amount depends on how you set it up. If you set up an installment agreement online through IRS.gov, the fee is $31. If you set it up by phone or mail, the fee is $225. Some payment plans may have access to for a reduced fee of $31 if your income is below a certain threshold, though the IRS does not widely advertise this option.

These fees are added to your balance, so you are paying interest on them as well. A $225 setup fee on a 60-month plan will cost you an additional $50 to $75 in interest over the life of the plan. This is another reason to explore whether a short-term extension or a lump-sum payment is possible before committing to a long-term plan.

What happens if you miss a payment on your plan

If you miss a payment on your IRS payment plan, the plan can be terminated, and the IRS can resume collection action. This means they can file a notice of federal tax lien, garnish your wages, or levy your bank account. Missing a single payment does not automatically trigger these actions, but it puts you at risk.

If you miss a payment, contact the IRS when ready to explain the situation. You may be able to reinstate the plan or negotiate a new one. The longer you wait to address a missed payment, the more likely the IRS is to take collection action. Interest and penalties continue to accrue regardless of whether your plan is active or suspended.

Strategies to reduce the total cost of your payment plan

If you have any way to pay a larger lump sum upfront, doing so reduces the balance on which interest accrues. Paying $2,000 toward a $10,000 debt when ready means you are only paying interest on $8,000 for the duration of the plan. Over a 60-month plan, this saves you roughly $200 to $300 in interest.

Another option is to request a Streamlined Installment Agreement if your debt is under $50,000. These plans have lower setup fees and simpler terms. If your debt is under $25,000, you may also may have access to for an online setup, which carries the lowest fee of $31.

You can also explore whether the IRS will accept an Offer in Compromise, which settles your tax debt for less than the full amount owed. This is difficult to may have access to for and requires detailed financial documentation, but it eliminates the ongoing interest and penalty charges if accepted. The IRS website has a tool to determine whether you might may have access to.

Frequently Asked Questions

Can I pay off my IRS payment plan early without a penalty?

Yes. The IRS does not charge a penalty for paying off your plan early. If you pay the full balance before the plan term ends, you stop accruing interest and penalties on that date. This is one reason to pay extra whenever you can—every dollar you pay early saves you interest for the remaining months of the plan.

Does the IRS interest rate change while I am on a payment plan?

Yes. The IRS sets its interest rate quarterly, and the rate that applies to your debt changes on those dates. If rates go up, your daily interest charge increases. If rates go down, your daily interest charge decreases. You will see these changes reflected in your account balance over time, but the IRS does not send a separate notice each time the rate changes.

What is the current IRS interest rate?

The IRS interest rate changes every three months. As of early 2024, the rate is approximately 8% to 9% annually. You can find the exact current rate on the IRS website under "Interest Rates" or by calling the IRS at 1-800-829-1040. The rate is always the federal short-term rate plus 3 percentage points.

Will the IRS waive the failure-to-pay penalty if I set up a payment plan?

No. The IRS does not automatically waive the failure-to-pay penalty when you enter a payment plan. You can request a waiver only if you have reasonable cause—such as a serious illness, death in the family, or a natural disaster that prevented you from paying on time. Most payment plan situations do not meet this standard.

How much will my payment plan cost in total interest and penalties?

This depends on your debt amount, the length of your plan, and the interest rates during the plan period. A rough estimate: a $10,000 debt on a 12-month plan costs $400 to $450 in interest plus $60 in penalties. A 60-month plan on the same debt costs $2,000 to $2,500 in interest plus $300 in penalties. The IRS does not provide a total-cost calculator, but you can estimate by multiplying your balance by the current annual interest rate and dividing by the number of months in your plan.