Yes, the IRS charges interest on payment plans, and you may owe penalties too
When you set up an installment agreement with the IRS to pay your tax debt over time, you still owe interest on the unpaid balance. The IRS also charges a one-time setup fee to create the plan. If you're late on any monthly payment, additional penalties apply. The interest rate is set quarterly and compounds daily — meaning the longer you take to pay, the more you owe beyond the original tax bill.
The interest rate for the current quarter is published on the IRS website, but it typically ranges from 8% to 10% per year, depending on the time of year. You cannot avoid this interest by choosing a payment plan; it accrues whether you pay in full immediately or spread payments over months or years. The only way to stop interest from growing is to pay off the entire debt.
Key Takeaways
- Interest accrues daily on any unpaid tax balance, regardless of whether you have a payment plan.
- The IRS charges a setup fee to create an installment agreement, ranging from $31 to $225 depending on the payment method you choose.
- If you miss a payment on your plan, the IRS adds a failure-to-pay penalty on top of the interest already owed.
- The interest rate changes quarterly and is based on the federal short-term rate plus 3 percentage points.
- Paying faster reduces the total interest you owe, even if you cannot pay the full amount right away.
How the IRS calculates interest on your payment plan
Interest on unpaid taxes is calculated using a rate set by the IRS each quarter. For 2024, the rate has ranged from 8% to 10% annually, though this varies. The IRS publishes the current rate on its website, and it changes on January 1, April 1, July 1, and October 1 each year.
The interest compounds daily, which means each day's interest is added to your balance, and the next day's interest is calculated on that larger amount. If you owe $5,000 and the rate is 8% annually, you owe roughly $1.10 per day in interest alone — before any penalties. Over a year-long payment plan, that interest adds up to around $400 on top of your original debt.
The IRS applies interest to the unpaid portion of your tax bill from the original due date until you pay in full. This means interest starts accruing on April 16 (the day after the tax deadline) if you file late, or on the date the IRS assesses the tax if you're audited or owe back taxes.
Setup fees and other costs tied to payment plans
The IRS charges a fee to set up an installment agreement. The amount depends on how you pay:
| Payment Method | Setup Fee |
|---|---|
| Direct debit from your bank account | $31 |
| Credit or debit card | $225 |
| Check or money order by mail | $225 |
| Electronic Federal Tax Payment System (EFTPS) | $225 |
The setup fee is a one-time charge added to your total debt. If you set up a plan for $3,000 and choose direct debit, your total obligation becomes $3,031 plus interest. These fees are non-refundable, even if you pay off the plan early.
Direct debit is the cheapest option because the IRS has lower costs collecting payments automatically from your bank. If you cannot set up direct debit, the other methods all cost $225.
Penalties if you miss a payment on your plan
Missing a payment on your installment agreement triggers a failure-to-pay penalty in addition to the interest already accruing. This penalty is 0.5% of the unpaid tax for each month (or part of a month) that the payment is late. If you miss a $500 payment by 30 days, the penalty is $2.50 (0.5% of $500).
The IRS also charges interest on the unpaid payment itself from the due date until you pay it. If you miss a payment by several months, the costs add up quickly. The IRS typically sends a notice before taking action, but you should contact them immediately if you cannot make a payment — they may be able to adjust your plan or temporarily pause it.
If you miss three consecutive payments, the IRS can terminate your agreement and demand full payment of the remaining balance. At that point, you would need to set up a new plan or find another way to resolve the debt.
How long your payment plan affects total interest
The longer your payment plan runs, the more interest you pay overall. A short-term plan (12 months or less) costs far less in interest than a long-term plan (five or six years). Here's how the math works:
If you owe $10,000 and the interest rate is 8% annually, paying it off in 12 equal monthly payments of about $860 means you pay roughly $320 in interest. Stretching those same payments over 60 months (five years) at about $200 per month means you pay roughly $1,000 in interest — three times as much.
This is why the IRS encourages faster payment plans when possible. Even if you can only afford a longer plan, paying extra when you have the money reduces the total interest owed. There is no penalty for paying off your plan early or paying more than the minimum monthly amount.
Comparing payment plans and their interest costs
The IRS offers different types of payment plans, and the setup fee varies by type. A short-term extension (120 days or less) costs nothing to set up and has no interest if you pay within that window. A long-term installment agreement (more than 120 days) requires the setup fee and accrues interest for the full duration.
If you owe less than $50,000, you can set up a plan online through IRS.gov without calling. The online tool shows you the monthly payment amount and total interest cost before you commit. For larger debts or complex situations, you may need to call the IRS or work with a tax professional.
Some people consider an Offer in Compromise (settling for less than you owe) if they cannot afford a payment plan, but this is a separate process with its own rules and costs. A payment plan is usually the fastest way to stop penalties from growing while you pay what you owe.
What to do if you cannot afford your monthly payment
If your circumstances change and you cannot make your monthly payment, contact the IRS before you miss it. You can request a temporary pause (called a hardship deferment) or ask to lower your monthly payment by extending the plan. The IRS will not automatically adjust your plan — you must ask.
Lowering your payment means extending the plan and paying more interest overall, but it keeps you in compliance and prevents the failure-to-pay penalty. If you lower your payment from $500 to $300 per month, your plan stretches longer and interest accrues for a longer period, but you avoid the 0.5% monthly penalty.
You can also pay a lump sum toward your balance at any time without penalty. If you receive a tax refund, bonus, or inheritance, putting that money toward your tax debt immediately reduces the interest owed going forward.
Frequently Asked Questions
Can I avoid interest by setting up a payment plan?
No. Interest accrues on unpaid tax from the original due date until you pay in full, regardless of whether you have a payment plan. The only way to stop interest is to pay off the entire debt. A payment plan does not reduce or waive interest — it only spreads the cost over time.
What is the current IRS interest rate?
The IRS interest rate changes quarterly and is based on the federal short-term rate plus 3 percentage points. For 2024, rates have ranged from 8% to 10% annually. Check IRS.gov for the current rate, which is published on the first day of each quarter (January 1, April 1, July 1, October 1).
Do I pay interest on the setup fee itself?
Yes. The setup fee is added to your total tax debt, and interest accrues on the full amount, including the fee. If you owe $5,000 in taxes and pay a $31 setup fee, interest is calculated on $5,031.
What happens if I pay off my plan early?
You can pay off your plan at any time without penalty. Paying early stops interest from accruing on the remaining balance, so you save money overall. There is no fee or cost for early payment — the IRS simply stops charging interest once the debt is paid in full.
How much will my payment plan cost in total?
Use the IRS payment plan calculator on IRS.gov to see the total cost before you commit. Enter your tax debt, the plan length you want, and the calculator shows the monthly payment, setup fee, and estimated interest. This gives you a clear picture of what you will owe by the end of the plan.