Yes, the IRS charges interest on payment plans, and it starts the day your tax bill was due

When you set up a payment plan with the IRS, you are not avoiding interest — you are continuing to pay it while you make monthly payments. The IRS charges interest on any unpaid tax from the original due date of your return, regardless of whether you pay in full when ready or spread payments over months or years. This interest compounds daily and is separate from any penalties you may owe.

The interest rate changes quarterly. The IRS sets it based on the federal short-term rate plus 3 percent. As of early 2024, the rate is around 8 percent per year, but you should check the IRS website or your payment plan agreement to see the exact rate that applies to your debt. The longer your plan runs, the more interest you will pay in total.

A payment plan does not stop interest from building. It straightforward lets you pay what you owe in installments instead of a lump sum. Each month, interest continues to accrue on your remaining balance until it is paid off completely.

Key Takeaways

  • Interest on your tax debt starts on the original due date of your return and continues until you pay the full amount, even while you are on a payment plan.
  • The IRS interest rate is set quarterly and is currently around 8 percent per year, though it varies based on federal rates.
  • Interest compounds daily, meaning you pay interest on the interest that has already accumulated.
  • You may also owe penalties in addition to interest, and both continue to grow while you are on a payment plan.
  • Paying off your plan faster reduces the total interest you will pay over time.

How much interest you will pay depends on your plan length

The longer your payment plan runs, the more interest accumulates. A short-term plan of a few months will cost you less in interest than a plan stretched over several years. For example, if you owe $5,000 and set up a 12-month plan, you will pay more in interest than if you set up a 6-month plan, because interest accrues on the remaining balance each month.

The IRS offers different plan lengths depending on how much you owe. Short-term plans (120 days or less) are available to anyone. Long-term installment agreements can run for years, and the longer the term, the lower your monthly payment but the higher your total interest cost. When you set up your plan, the IRS will show you the estimated interest you will pay based on the plan length you choose.

You can always pay faster than your plan requires. If you send extra money toward your tax debt, it reduces your balance and the amount of interest that will accrue going forward. There is no penalty for paying early or paying more than your monthly amount.

Interest is different from penalties, and you may owe both

Penalties are separate charges the IRS adds for filing late or paying late. The most common is the failure-to-pay penalty, which is typically 0.5 percent of your unpaid tax per month (up to 25 percent total). Like interest, penalties continue to accrue while you are on a payment plan.

Your total debt includes the original tax owed, plus interest, plus penalties. A payment plan covers all three, but all three continue to grow until the plan is paid off. This is why understanding your full bill — not just the tax amount — matters when you are deciding on a plan length.

If you filed your return late, you may also owe a failure-to-file penalty in addition to the failure-to-pay penalty. The IRS will include both in your bill and in your payment plan calculation.

What happens to interest if you miss a payment

If you miss a payment on your plan, the IRS may default you — meaning your plan is cancelled and the full remaining balance becomes due when ready. Interest continues to accrue during any default period, and you may face additional penalties for breaking the agreement.

If you know you will miss a payment, contact the IRS before the due date. You may be able to request a short extension or modify your plan to a longer term with a lower monthly payment. The IRS is more willing to work with you if you reach out proactively rather than straightforward missing a payment.

Ways to reduce the total interest you pay

The fastest way to reduce interest is to pay off your debt as quickly as possible. Even small extra payments toward your balance reduce the amount of interest that will accrue. If you receive a tax refund in a future year while you are on a payment plan, the IRS will automatically explore that refund to your remaining balance, which also reduces interest.

Another option is to request a short-term plan if your debt is small enough. The IRS allows payment plans of 120 days or less without a setup fee, and these plans cost far less in interest than longer plans. If you can manage a higher monthly payment for a shorter period, this is usually the cheapest option overall.

Some people also explore whether they may have access to for an Offer in Compromise, which is a settlement for less than the full amount owed. This is a separate process from a payment plan and requires meeting specific criteria, but if you may have access to, it stops interest from accruing on the forgiven portion of your debt.

The setup fee for a payment plan is a separate cost

In addition to interest, the IRS charges a setup fee to create a payment plan. The fee varies depending on the type of plan and how you set it up. As of 2024, setup fees range from $31 to $225, depending on whether you use online payment plans, phone payment plans, or work with a payment plan through a tax professional.

Short-term plans (120 days or less) have lower or no setup fees. Long-term installment agreements have higher setup fees but spread your payments over a longer period. The IRS will tell you the exact setup fee before you agree to the plan.

Frequently Asked Questions

Can I stop interest from accruing while I am on a payment plan?

No. Interest accrues from the original due date of your return until your debt is paid in full, regardless of whether you are on a payment plan. A payment plan does not pause or reduce interest — it only lets you pay in installments instead of a lump sum.

What is the current IRS interest rate?

The IRS interest rate changes quarterly and is currently around 8 percent per year. The exact rate depends on the federal short-term rate plus 3 percent. Check your payment plan agreement or the IRS website for the rate that applies to your specific debt.

If I pay off my plan early, do I save money on interest?

Yes. Paying off your plan faster reduces the total interest you will pay because interest stops accruing once your debt is paid in full. Any extra payments you make reduce your remaining balance and the interest that will build on it going forward.

Do I owe interest on the setup fee for my payment plan?

No. The setup fee itself does not accrue interest. However, interest continues to accrue on your original tax debt, penalties, and any unpaid interest from previous periods while you are on the plan.

What happens to interest if my payment plan is cancelled?

Interest continues to accrue on any remaining balance after your plan is cancelled. If you default on the plan, the full amount becomes due when ready, and interest keeps building until you pay it off or reach a new agreement with the IRS.