Interest rates on IRS payment plans are set by federal law, not negotiated
The interest rate on an IRS payment plan is the same as the interest rate on any unpaid tax debt: the federal short-term rate plus 3 percent, compounded daily. The IRS sets this rate quarterly. As of early 2024, the rate is 8 percent per year, but it changes every three months based on Treasury rates. You pay interest from the date your tax was due until you pay it off completely.
The interest accrues whether you set up a payment plan or not. The payment plan itself does not add extra interest on top of what you already owe. What changes is the failure-to-pay penalty—the monthly charge for not paying by the original due date. On a payment plan, this penalty is reduced from 0.5 percent per month to 0.25 percent per month, which saves you money over time.
Both interest and the reduced penalty continue to grow each month until your balance hits zero. If you miss a payment on your plan, the penalty can jump back to the full 0.5 percent rate, and the IRS may terminate your agreement.
Key Takeaways
- Interest on an IRS payment plan is the federal rate plus 3 percent, currently around 8 percent yearly, and it compounds daily from the original tax due date.
- The failure-to-pay penalty drops from 0.5 percent per month to 0.25 percent per month when you have an active payment plan, cutting your total cost.
- Interest and penalties both continue to accrue each month, so the longer you take to pay, the more you owe beyond your original tax bill.
- Missing a payment can end your plan and restore the full 0.5 percent monthly penalty, plus potential additional fees.
- The IRS publishes its interest rate quarterly; you can find the current rate on IRS.gov or ask when you set up your plan.
How the interest rate is calculated and when it changes
The IRS calculates interest daily using a formula: your unpaid tax balance multiplied by the annual interest rate, divided by 365. This means interest grows every single day, even on weekends and holidays. If your balance is $5,000 and the rate is 8 percent, you owe roughly $1.10 per day in interest alone.
The IRS announces new interest rates on the first business day of each calendar quarter—January, April, July, and October. The rate is tied to the federal short-term rate published by the Treasury Department. If Treasury rates rise, your IRS interest rate rises 90 days later. If they fall, your rate falls. You do not have to do anything when the rate changes; the IRS applies the new rate automatically to your remaining balance.
You can find the current interest rate on the IRS website under "Interest Rates" or by calling the IRS at 800-829-1040. When you set up a payment plan by phone or online, the IRS will tell you the current rate and show you an estimate of total interest you will pay if you stick to your planned monthly payment.
The failure-to-pay penalty and how a payment plan reduces it
In addition to interest, the IRS charges a failure-to-pay penalty for not paying your tax by the original due date. Without a payment plan, this penalty is 0.5 percent of your unpaid tax per month (or part of a month). On a $5,000 debt, that is $25 per month in penalties alone, on top of interest.
When you enter into a payment plan—whether a short-term agreement, an installment agreement, or a long-term plan—the IRS reduces this penalty to 0.25 percent per month. On the same $5,000 debt, that drops your monthly penalty to $12.50. Over a two-year payment plan, that reduction saves you $300 in penalties.
The reduced penalty applies only while your plan is active and you make payments on time. If you miss a payment or the IRS terminates your plan, the penalty reverts to the full 0.5 percent rate on the remaining balance. The IRS will notify you if your plan is at risk.
Total cost examples: what you actually pay over time
The total amount you pay depends on three things: your original tax debt, the interest rate, and how long your payment plan lasts. Here are two realistic scenarios using an 8 percent interest rate and a 0.25 percent monthly penalty.
| Original Tax Debt | Monthly Payment | Plan Length | Total Interest Paid | Total Penalties Paid | Total Amount Paid |
|---|---|---|---|---|---|
| $3,000 | $150 | 20 months | ~$240 | ~$75 | ~$3,315 |
| $10,000 | $200 | 50 months | ~$1,100 | ~$625 | ~$11,725 |
These numbers assume you make every payment on time and the interest rate stays constant. In reality, rates may change, and if you miss a payment, your costs rise. The longer your plan, the more interest you pay overall, but smaller monthly payments may be the only way you can afford to settle the debt.
What happens if you pay off your plan early
If you receive a bonus, inheritance, or other windfall and want to pay off your IRS debt before your plan ends, you can do so without penalty. The IRS will not charge you a fee for early payment, and you will stop accruing interest and penalties the day you pay the final balance.
To pay early, contact the IRS at the number on your payment plan notice and ask for your current payoff amount. This figure includes all accrued interest and penalties up to that date. You can pay by phone, online through IRS.gov, or by mail. Once the IRS receives and processes your payment, your account is closed and your plan is satisfied.
Paying early is one of the few ways to reduce your total cost. Every month you shorten the plan saves you roughly one month's worth of interest and penalties combined.
Missed payments and what they cost you
If you miss a payment on your IRS plan, the consequences are immediate and expensive. The IRS charges a failure-to-pay penalty of 0.5 percent per month on the unpaid amount—double the rate you were paying under the plan. You also owe a failure-to-file penalty if you did not file a return, though this does not apply if you are already on a plan for a filed return.
One missed payment does not automatically end your plan. The IRS typically sends a notice giving you 30 days to catch up. If you do not respond or make the payment, the IRS will terminate your agreement. Once terminated, the full balance becomes due immediately, and the IRS may pursue collection action such as wage garnishment or bank levy.
If you know you will miss a payment, contact the IRS before the due date. You may be able to modify your plan to lower your monthly payment or extend the timeline. The IRS is often willing to work with you if you reach out proactively rather than simply missing the payment.
How to estimate your total cost before you commit
Before you set up a payment plan, the IRS provides a cost estimate. When you apply online through IRS.gov or by phone, you enter your total debt and your proposed monthly payment. The system calculates how many months the plan will last and shows you the estimated total interest and penalties you will pay.
This estimate assumes the interest rate stays the same and you make every payment on time. Real costs may vary if rates change or if you miss payments. But the estimate gives you a realistic picture of what the plan will cost you, so you can decide whether to accept it or look for other options such as an Offer in Compromise (a settlement for less than you owe) or Currently Not Collectible status (a temporary pause on collection).
Keep the estimate for your records. It is not a binding agreement, but it shows what you agreed to and helps you track your progress as you make payments.
Frequently Asked Questions
Can I negotiate the interest rate on my payment plan?
No. The interest rate is set by federal law and changes quarterly based on Treasury rates. The IRS does not negotiate rates with individual taxpayers. The only way to reduce your total cost is to pay off the plan faster or to pursue other relief options like an Offer in Compromise.
Does the interest rate change if I switch payment methods?
No. The interest rate is the same whether you pay by phone, online, automatic withdrawal, or check. Automatic withdrawal from your bank account does lower your monthly failure-to-pay penalty by an additional 0.05 percent (from 0.25 to 0.20 percent), which saves a small amount over time.
What if the interest rate goes up while I'm on my plan?
Your interest rate will increase automatically when the IRS announces a new quarterly rate. Your monthly payment amount does not change unless you ask the IRS to modify your plan. The higher rate means more of each payment goes to interest and less to principal, so your plan may take longer to complete.
Can I deduct the interest I pay on my tax debt?
Interest paid to the IRS on a personal income tax debt is not deductible. If you owe tax on a business or investment income, some interest may be deductible as a business expense, but you should consult a tax professional to confirm.
What is the difference between interest and penalties?
Interest is the cost of borrowing money from the IRS; it accrues daily and is based on the federal rate plus 3 percent. Penalties are charges for not filing or not paying on time; they accrue monthly and are a percentage of your unpaid tax. Both are added to your debt, and both continue to grow until you pay off your balance.