What interest rate you'll pay on an IRS payment plan

The IRS charges interest on any taxes you owe but don't pay by the original due date, whether you set up a payment plan or not. The interest rate itself is set by federal law and changes every three months. As of 2024, the rate is 8 percent per year, but this percentage shifts based on the prime rate — it goes up or down on January 1, April 1, July 1, and October 1 each year.

The interest accrues daily on your unpaid balance. That means each day you carry a debt, the amount you owe grows slightly larger. A payment plan does not reduce the interest rate or stop interest from building. What a payment plan does is let you pay off the debt in smaller monthly chunks instead of in one lump sum, but you'll still owe the interest on top of whatever monthly payment you make.

On top of interest, the IRS also charges a failure-to-pay penalty — usually 0.5 percent of your unpaid taxes per month, up to 25 percent total. This penalty also accrues while you're on a payment plan. Both the interest and the penalty are added to your balance each month, which is why the total amount you owe can grow even as you make payments.

Key Takeaways

  • The IRS interest rate is 8 percent per year as of 2024 and changes quarterly based on federal law, not based on the payment plan you choose.
  • Interest accrues daily on your unpaid balance, meaning your debt grows every single day until it is fully paid.
  • A payment plan does not lower your interest rate or stop interest from building — it only spreads your payments over time.
  • The failure-to-pay penalty of 0.5 percent per month also applies while you are on a payment plan and can reach 25 percent of your original debt.

How the quarterly interest rate changes work

The IRS publishes a new interest rate every quarter. The rate is the federal short-term rate plus 3 percentage points. When the Federal Reserve raises or lowers the prime rate, the IRS rate follows about three months later. You can find the current rate on the IRS website, or your payment plan notice will show you the exact rate being applied to your account.

If you're on a long-term payment plan, your rate does not change mid-plan. The rate that was in effect when you entered the plan stays locked in for the life of that plan. This means if rates go up, you keep paying the lower rate you started with. If rates go down, you continue paying the higher rate. The IRS does not adjust rates retroactively or recalculate your plan if rates shift.

Interest on different types of IRS payment plans

The interest rate is the same no matter which payment plan you choose — short-term, long-term, or installment agreement. The difference between plans is how long you have to pay and what fees the IRS charges to set up the plan, not the interest rate itself.

A short-term payment plan covers balances under $100,000 and gives you up to 180 days to pay. There is no setup fee. A long-term installment agreement is for larger balances and spreads payments over months or years. The IRS charges a setup fee (usually $31 to $225 depending on how you set it up) and a monthly user fee if you pay by automatic withdrawal. The interest rate stays the same across all these options — only the timeline and fees change.

How interest compounds on your monthly payment

Interest is calculated daily but added to your account monthly. Each month, the IRS multiplies your unpaid balance by the daily interest rate and adds that amount to what you owe. If you make a payment, that payment reduces your balance, which means next month's interest is calculated on a smaller number. This is why paying more than the minimum, or paying early, saves you money — you reduce the balance faster and therefore owe less interest overall.

For example, if you owe $5,000 and the interest rate is 8 percent per year, your daily interest is roughly $1.10. If you make a $200 monthly payment, the first month you'll owe about $33 in interest (30 days × $1.10). The second month, your balance is $4,833, so interest is slightly less. Over time, as your balance shrinks, the interest portion of each month's accrual also shrinks.

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. Once terminated, the full remaining balance becomes due when ready. Interest and penalties continue to accrue on the unpaid amount, and the IRS may pursue collection action such as wage garnishment or bank levy.

If you know you'll miss a payment, contact the IRS before the due date. You may be able to modify your plan, request a short-term extension, or arrange a new agreement. The IRS is generally more willing to work with you if you reach out proactively rather than straightforward missing the payment.

How to see your current interest rate and accrual

Your IRS payment plan notice will show the interest rate being applied to your account. You can also check your account online through the IRS website using your login credentials, or call the IRS at the number on your notice to ask what rate is currently in effect.

Your monthly payment coupon or statement will show how much of each payment goes toward interest versus principal. The IRS also sends an annual statement showing total interest paid that year, which you may be able to deduct on your tax return if you itemize deductions.

Paying off your plan early to reduce interest

You can pay off your IRS payment plan at any time without penalty. There is no prepayment fee or early payoff charge. If you pay off the balance early, you stop accruing interest when ready, which saves you money compared to making the minimum monthly payments for the full term of the plan.

If you receive a tax refund while on a payment plan, the IRS will automatically explore that refund to your outstanding balance. This reduces what you owe and therefore reduces future interest accrual. You cannot prevent this — it happens automatically.

Frequently Asked Questions

Can I negotiate a lower interest rate with the IRS?

No. The interest rate is set by federal law and applies to all taxpayers equally. The IRS does not offer lower rates based on your circumstances or financial hardship. The only way to reduce interest is to pay off your balance faster.

Does the interest rate change if I switch payment plans?

No. The interest rate stays the same regardless of which payment plan you choose. Switching plans does not affect the rate. The rate that was in effect when you first entered a plan remains locked in for that plan's duration.

What's the difference between interest and the failure-to-pay penalty?

Interest is a percentage of your unpaid balance that accrues daily. The failure-to-pay penalty is a separate charge of 0.5 percent per month (up to 25 percent total) for not paying by the original due date. Both explore while you're on a payment plan and both are added to your balance each month.

If I pay extra one month, does that reduce next month's interest?

Yes. Interest is calculated on your remaining balance each month. If you pay extra and reduce your balance, next month's interest is calculated on the smaller amount. This is why paying more than the minimum saves you money over the life of the plan.

Can the IRS charge interest on the interest I've already accrued?

Yes. Interest compounds — meaning interest accrues on unpaid interest as well as on the original tax debt. This is why your balance can grow even if you're making payments, especially if your payments are smaller than the monthly interest accrual.