The IRS charges a setup fee and monthly interest, but the total cost depends on which plan you choose and how long you take to pay

The IRS does not charge a flat fee for all payment plans. Instead, you pay a one-time setup fee when you enroll, plus interest and penalties that accrue daily on your unpaid balance. The setup fee ranges from $31 to $225, depending on whether you set up payments online, by phone, or through a payment processor. Interest compounds daily at a rate set quarterly by the IRS—currently around 8% per year, though this changes. The longer your plan runs, the more interest you pay overall.

The IRS also charges a failure-to-pay penalty of 0.5% of your unpaid tax per month, which continues to accrue even while you are on a payment plan. This is separate from the setup fee and interest. If you miss a payment on your plan, the IRS may terminate it and demand the full balance immediately.

Key Takeaways

  • Setup fees range from $31 to $225 depending on how you enroll, with online enrollment costing the least.
  • Interest accrues daily at a rate the IRS sets each quarter, currently around 8% annually, and compounds on top of your original tax debt.
  • A failure-to-pay penalty of 0.5% per month continues to accrue while you are on a payment plan, separate from interest and setup fees.
  • Short-term plans (120 days or fewer) have lower setup fees than long-term installment agreements, so paying faster reduces your total cost.

Setup fees: what you pay to start a plan

The IRS charges a setup fee the moment you enroll in a payment plan. This fee is not refundable and does not go toward your tax debt—it is purely the cost of setting up the agreement. The amount depends on your enrollment method.

Online enrollment through IRS.gov costs $31. Enrolling by phone or mail costs $225. If you use a third-party payment processor or tax professional to set up the plan, that processor may charge an additional fee on top of the IRS fee. Some processors charge $50 to $100 extra, though this varies. The IRS fee itself remains the same regardless of how much you owe or how long your plan lasts.

If you cannot afford the $225 phone fee, enroll online instead. The IRS does not waive setup fees based on income, but the $31 online option is available to everyone.

Interest rates and how they compound

The IRS charges interest on your unpaid tax balance at a rate it sets every three months. The rate is the federal short-term rate plus 3 percentage points. As of early 2024, this rate is approximately 8% per year, but it changes quarterly. You can find the current rate on IRS.gov under "Interest Rates."

Interest compounds daily, meaning you pay interest on the interest you have already accrued. On a $5,000 debt at 8% annual interest, you would owe roughly $400 in interest per year if you made no payments—but that $400 itself accrues interest the next day. Over a three-year payment plan, the total interest cost could exceed $1,200 when compounding is factored in.

Interest stops accruing only when your balance reaches zero. It does not pause if you miss a payment or if your plan is suspended.

The failure-to-pay penalty that runs alongside your plan

In addition to interest, the IRS charges a failure-to-pay penalty of 0.5% of your unpaid tax balance each month. This penalty continues to accrue even while you are making payments on a plan. It is separate from the setup fee and interest.

On a $10,000 tax debt, the failure-to-pay penalty is $50 per month. Over a 24-month payment plan, that penalty alone adds $1,200 to your debt. The penalty can reach a maximum of 25% of your original tax debt, at which point it stops accruing, but that takes a long time to reach.

The only way to stop the failure-to-pay penalty is to pay your tax debt in full. It does not stop when you enroll in a plan; it only stops when your balance is zero.

Short-term plans versus long-term installment agreements

The IRS offers two main types of payment plans: short-term agreements (120 days or fewer) and long-term installment agreements (longer than 120 days). The setup fee is lower for short-term plans, and you pay less total interest because the debt is paid off faster.

A short-term plan costs $31 to set up online and has no monthly payment requirement—you simply agree to pay the full balance within 120 days. This is useful if you expect a refund, bonus, or inheritance soon and can clear the debt quickly. You still pay interest and the failure-to-pay penalty, but only for a few months instead of years.

A long-term installment agreement costs $31 online or $225 by phone and allows you to spread payments over several years. The IRS typically allows plans of up to 72 months (six years), though longer terms may be possible for very large debts. The tradeoff is that you pay significantly more in total interest and penalties because the debt takes longer to clear.

How to calculate your total cost

Your total cost on a payment plan includes the setup fee, plus all interest and penalties that accrue from now until you pay the debt off. The IRS does not provide a calculator for this, but you can estimate it.

Start with your unpaid tax balance. Add the setup fee ($31 or $225). Then estimate interest: multiply your balance by the current interest rate (around 8%) and divide by 12 to get a monthly figure. Multiply that by the number of months your plan will run. Add the failure-to-pay penalty: 0.5% of your balance per month, multiplied by the number of months. The sum is your approximate total cost.

Example: $5,000 tax debt, 36-month plan, 8% interest, online setup. Setup fee: $31. Interest: roughly $1,200 (compounding). Failure-to-pay penalty: $900 (0.5% × 36 months). Total cost: approximately $2,131 on top of the $5,000 you owe.

This is why paying faster always costs less. A 12-month plan on the same $5,000 would cost roughly $400 in interest and $300 in penalties—a savings of over $1,400.

Fees you might avoid by paying differently

If you can pay your tax debt in full before the IRS assesses it, you avoid the setup fee, interest, and failure-to-pay penalty entirely. Paying in full by the original tax deadline or during the IRS collection process stops all accrual.

If you cannot pay in full but have access to a loan or credit line, borrowing to pay the IRS immediately may cost less than a payment plan. A personal loan at 10% interest over 36 months might cost less than the IRS plan when you factor in the failure-to-pay penalty and compounding interest.

An Offer in Compromise is another option if you owe a large amount and cannot pay it in full or through a reasonable plan. The IRS may accept less than you owe, though this is rare and requires proof of financial hardship. There is a $225 application fee, but if accepted, you avoid years of interest and penalties. This is not a payment plan—it is a settlement.

What happens if you miss a payment

If you miss a payment on your IRS plan, the IRS may terminate the agreement and demand the full remaining balance immediately. You then have 30 days to pay or face collection action, including wage garnishment or bank levy.

If you know you will miss a payment, contact the IRS before the due date. You can request a short-term extension (usually 120 days) or ask to modify your plan to lower the monthly payment. The IRS is more likely to work with you if you reach out proactively rather than simply missing a payment.

Missing a payment also triggers additional penalties and interest, so the total cost of your debt continues to climb.

Frequently Asked Questions

Can the IRS reduce or waive the setup fee?

The IRS does not waive setup fees based on income or hardship. However, you can reduce the fee by enrolling online ($31) instead of by phone ($225). If you cannot afford even $31, you may be may be able to access for an Offer in Compromise or Currently Not Collectible status, which pauses collection temporarily.

Does the interest rate change while I'm on a payment plan?

Yes. The IRS adjusts its interest rate every three months based on the federal short-term rate. If rates go up, your monthly interest accrual increases. If rates go down, it decreases. You will not know the exact total cost of your plan until it is paid off.

What's the difference between a payment plan and an Offer in Compromise?

A payment plan lets you pay your full tax debt over time with interest and penalties. An Offer in Compromise is a settlement where the IRS accepts less than you owe. Offers are rare and require proof you cannot pay the full amount. A payment plan is faster to set up but costs more overall.

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

Yes. Interest accrues daily, so paying off your plan early stops interest from accruing on future days. You cannot recover interest already paid, but you avoid interest on the remaining balance. The failure-to-pay penalty also stops accruing once your balance is zero.

Can I set up a payment plan if I owe less than $25,000?

Yes. The IRS allows payment plans for any amount owed. However, if you owe less than $25,000, you may may have access to for a streamlined installment agreement, which has a lower setup fee ($31 online) and faster approval. Amounts over $50,000 may require a financial statement and have stricter terms.