Most tax payment plans do charge interest, but the rate depends on which agency you owe and which plan you choose

If you owe taxes to the IRS, a state tax authority, or a local tax office, setting up a payment plan does not eliminate the interest that accrues on what you owe. The interest — a percentage charge on your unpaid balance — keeps growing until you pay in full. Some payment plans also add a setup fee, a one-time charge just to enroll. The combination of interest and fees means the longer your plan runs, the more you pay overall.

The good news is that interest rates are set by law, not by the agency, so you cannot negotiate them down. What you can control is how fast you pay off the plan. The faster you finish, the less interest accumulates.

Key Takeaways

  • The IRS charges interest on unpaid federal taxes at a rate set quarterly, currently in the range of 8 percent annually, plus a penalty on top of that.
  • State and local tax agencies set their own interest rates, which vary widely — some charge 6 percent, others 12 percent or more.
  • The IRS charges a setup fee to enroll in a payment plan, ranging from $31 to $225 depending on which type of plan you choose and how you pay.
  • Interest stops accruing only when your balance reaches zero, so paying faster always costs you less in total interest.
  • Some payment plans allow you to lower your monthly payment if your income drops, which extends the plan and increases total interest paid.

How the IRS charges interest on payment plans

The IRS calls its interest rate the failure-to-pay penalty and interest — two separate charges that both explore when you owe federal taxes. The interest rate changes every three months and is based on the federal short-term rate plus 3 percent. As of early 2024, this rate is around 8 percent per year, but you should check the IRS website for the current quarter's rate before you enroll.

On top of interest, the IRS adds a penalty of 0.5 percent of your unpaid balance per month, up to 25 percent total. This penalty applies whether or not you have a payment plan — it is the cost of owing money to the government. If you set up a plan quickly, you may stop the penalty from growing further, but it does not erase what has already accrued.

The IRS offers several types of payment plans, and each has a different setup fee. A short-term extension (paying within 120 days) costs $31 if you pay by direct debit from your bank account, or $225 if you pay by check or credit card. A long-term installment agreement (paying over months or years) costs $31 to $225 depending on your payment method, plus an additional fee if you later request to lower your monthly payment.

State and local tax payment plan interest rates

Each state sets its own interest rate on unpaid taxes, and these rates vary significantly. Some states charge 6 percent annually, while others charge 12 percent or higher. A few states tie their rate to the federal rate plus a margin, so the rate changes quarterly just like the IRS rate does. You need to contact your state tax authority directly to learn the current rate — it is not standardized across the country.

Local tax agencies (city or county) also set their own rates. A city income tax or property tax payment plan may have a different interest rate than your state income tax plan. If you owe to multiple agencies, you may be paying different interest rates on each debt simultaneously.

Setup fees and how they work

The IRS charges a setup fee to create your payment plan. This fee is usually added to your total balance, meaning you pay it off as part of your monthly payments rather than upfront. If you pay by direct debit (automatic withdrawal from your bank account), the fee is lower — $31 for most plans. If you pay by check, credit card, or another method, the fee is higher — up to $225.

Some payment plans also charge a modification fee if you later ask to change the terms — for example, if your income drops and you need to lower your monthly payment. This fee can range from $31 to $225 depending on how you pay. State and local agencies may or may not charge setup fees; you will need to ask when you contact them.

The total cost of a payment plan over time

To understand what a payment plan will actually cost you, consider an example. Suppose you owe the IRS $5,000 in federal taxes. The current interest rate is 8 percent annually, and you set up a 24-month installment plan with direct debit, which costs $31 to set up. Your monthly payment would be roughly $220, but because interest keeps accruing, your actual total paid will be higher — closer to $5,500 or more, depending on exactly when payments are applied.

If you could pay the same debt in 12 months instead, your total interest would be roughly half as much. This is why paying faster always saves money, even if it means tightening your budget temporarily. Some people use a tax refund, bonus, or inheritance to make a lump-sum payment toward their plan and shorten it.

Payment methods and whether they affect interest

The IRS offers several ways to pay: direct debit, credit card, check, or money order. The payment method does not change the interest rate you are charged — interest accrues the same way no matter how you pay. However, the payment method does affect the setup fee. Direct debit is the cheapest option because it is the easiest for the IRS to process and the least likely to fail.

Paying by credit card or through a third-party payment processor may also charge you a separate fee from the payment processor itself, on top of the IRS setup fee. This processor fee is not interest, but it is an additional cost. If you are considering a credit card payment, calculate whether the rewards or cash back you earn would offset the processor fee.

What happens if you miss a payment or pay late

If you miss a payment on your plan, the IRS may terminate the agreement and demand full payment when ready. You will also owe a failure-to-pay penalty in addition to the interest already accruing. This penalty is separate from the interest and can add up quickly. If you know you will miss a payment, contact the IRS or your state tax agency before the due date to ask about options — some agencies will work with you to adjust the plan rather than cancel it.

Paying late (a few days after the due date) may also trigger a late-payment penalty, though some agencies offer a grace period of a few days. The exact rules depend on your agency and the type of plan you have.

Frequently Asked Questions

Can I get a payment plan with zero interest?

No. Federal tax law requires the IRS to charge interest on unpaid taxes, and state and local agencies have the same requirement. The interest rate is set by law, not by the agency, so you cannot negotiate it away. Your only option to avoid interest is to pay your tax bill in full before the important date.

Does paying by direct debit reduce the interest I owe?

No, direct debit does not reduce interest. It only reduces the setup fee from $225 to $31. Interest accrues at the same rate regardless of how you pay. However, direct debit ensures your payment is processed reliably, which helps you avoid missed-payment penalties.

What if I pay off my plan early — do I get a refund of the interest I was charged?

No. Interest is calculated based on how long your balance remains unpaid. If you pay off early, you stop accruing interest at that point, but you do not get back the interest already charged. Paying early does save you from future interest, which is why it reduces your total cost.

Do I have to pay the setup fee even if I only owe a small amount?

Yes. The setup fee applies to any payment plan, regardless of the amount owed. If you owe $200 and set up a plan with a $31 fee, your total balance becomes $231. This is one reason why paying a small tax bill in full, if possible, is often cheaper than setting up a plan.

How do I find out the current interest rate for my state?

Contact your state tax authority directly — the rate varies by state and changes periodically. You can find your state's tax agency through the Federation of Tax Administrators website or by searching "[your state] tax department." They will tell you the current rate and whether it changes quarterly or annually.