The IRS charges interest on unpaid taxes, and that interest applies to payment plans too
If you set up a payment plan with the IRS, you pay interest on the full amount you owe, not just on what remains unpaid. The interest rate is 8% per year, calculated daily. That rate does not change based on how long your plan lasts or how much you owe. The IRS also charges a failure-to-pay penalty of 0.5% per month on top of the interest, which continues to accrue until you pay in full.
Beyond interest and penalties, the IRS charges a setup fee to create the payment plan itself. That fee ranges from $31 to $225 depending on which type of plan you choose and how you set it up. A short-term plan (120 days or less) costs $31. A long-term installment agreement costs $225 if you pay by check or money order, but $31 if you pay by electronic debit from your bank account.
The interest and penalties do not stop accruing while you make payments. If your plan lasts two years, you will pay interest for the full two years, plus the monthly penalty for the full two years. This is different from some retail payment plans, where interest may be waived if you pay on time.
Key Takeaways
- The IRS interest rate on payment plans is 8% per year, calculated daily on the full balance owed, regardless of plan length.
- A failure-to-pay penalty of 0.5% per month accrues on top of interest until the debt is paid in full.
- Setup fees range from $31 for short-term plans to $225 for long-term installment agreements paid by check, or $31 if you set up electronic bank debit.
- Interest and penalties continue to accrue throughout the entire payment plan, so a longer plan means more total interest paid.
- The 8% rate is fixed and does not vary based on credit score, income, or how much you owe.
How the 8% interest rate is calculated on your balance
The IRS calculates interest daily using a simple formula: your unpaid tax balance multiplied by 8%, divided by 365 days. This means the interest compounds every single day. If you owe $10,000 and make no payments for 30 days, you will owe roughly $66 in interest alone (before penalties).
The interest is calculated on the full original amount you owed when you entered the payment plan, not on the remaining balance. So if you owe $10,000 and set up a 24-month plan, the IRS charges 8% interest on $10,000 for all 24 months, even as you pay it down. This is why shorter payment plans cost less in total interest.
The interest accrues whether you pay on time or late. If you miss a payment, interest continues to accrue on the full amount, and you may also face additional penalties for the missed payment itself.
The failure-to-pay penalty stacks on top of interest
In addition to the 8% interest, the IRS charges a failure-to-pay penalty of 0.5% per month (or 6% per year) on any unpaid tax balance. This penalty accrues every month until you pay the tax in full. It is separate from interest and is calculated on the same unpaid balance.
The penalty does not disappear if you set up a payment plan. It continues to accrue throughout the plan. If you owe $10,000 and set up a 24-month plan, you will pay roughly $1,200 in penalties alone (0.5% × 24 months × $10,000), plus the interest on top of that.
The IRS can reduce or remove the failure-to-pay penalty in limited cases — for example, if you can show reasonable cause for the delay, such as a serious illness or a death in the family. But this requires a formal request and is not automatic.
Setup fees depend on how you choose to pay
The IRS charges a one-time fee to set up a payment plan. The amount depends on the type of plan and your payment method:
| Plan Type | Check or Money Order | Electronic Bank Debit |
|---|---|---|
| Short-term (120 days or less) | $31 | $31 |
| Long-term installment agreement | $225 | $31 |
Electronic bank debit is cheaper because the IRS has lower processing costs. If you cannot afford the setup fee, you can request a fee reduction or waiver, but you must submit Form 656-L (Offer in Compromise) or contact the IRS directly to ask.
The setup fee is added to your payment plan balance, so you end up paying interest on the fee itself. If you set up a $10,000 plan with a $225 fee, you are actually paying interest on $10,225.
Shorter payment plans cost less in total interest
Because interest accrues daily for the entire length of the plan, the longer your plan lasts, the more interest you pay. A 12-month plan costs roughly half the interest of a 24-month plan on the same balance.
The IRS allows payment plans up to 72 months (six years) for larger balances. If you owe less than $50,000, you can set up a plan for up to 72 months. If you owe more, the timeline may be shorter or you may need to work with a revenue officer.
If you can afford to pay faster, doing so saves money. Even paying an extra $50 per month on a $10,000 plan cuts the total interest paid by several hundred dollars over the life of the plan.
How to find out your exact interest and penalty charges
The IRS provides a breakdown of interest and penalties on your notice of tax due. You can also call the IRS at 1-800-829-1040 to ask for a current balance, which includes all accrued interest and penalties to that date.
If you set up a payment plan online through IRS.gov, the system will show you an estimate of the total amount you will pay, including interest, penalties, and setup fees. This estimate assumes you make all payments on time and do not incur additional penalties.
Your monthly payment statement will also show how much of each payment goes toward interest, penalties, and the original tax. This helps you see how much of your payment is actually reducing the principal balance.
What happens if you pay off the plan early
You can pay off a payment plan early without penalty. The IRS will not charge you a fee for early payoff, and you will stop accruing interest once the balance reaches zero.
If you receive a tax refund while you are on a payment plan, the IRS will automatically apply it to your balance. This reduces the amount you owe and the interest that continues to accrue.
If your financial situation improves and you can pay a lump sum, doing so immediately stops the daily interest accrual on that portion of the debt. For example, if you owe $10,000 and pay $5,000 early, interest will accrue only on the remaining $5,000 going forward.
Frequently Asked Questions
Can the IRS lower the 8% interest rate on my payment plan?
No. The 8% interest rate is set by law and does not change based on your circumstances, credit score, or how much you owe. The IRS cannot negotiate or reduce the rate itself. However, you may be able to reduce the failure-to-pay penalty if you can show reasonable cause for the delay.
What if I miss a payment on my IRS payment plan?
If you miss a payment, the IRS will charge you a late payment penalty in addition to the interest and failure-to-pay penalty already accruing. The plan may also be terminated, and the IRS may pursue collection action. Contact the IRS immediately if you cannot make a payment to discuss options.
Is the 8% interest rate the same as the interest on a retail payment plan?
No. Retail payment plans often charge 0% interest if you pay on time, or a percentage set by the retailer (often 15% to 30%). The IRS rate is fixed at 8% and accrues regardless of whether you pay on time. The IRS also charges the additional failure-to-pay penalty, which retail plans do not.
How much will I pay in total interest on a $5,000 tax debt over 24 months?
Roughly $1,000 in interest alone, plus $600 in failure-to-pay penalties, plus the $225 setup fee (if paying by check). The exact amount depends on the daily interest calculation and whether you make all payments on time. Use the IRS payment plan calculator on IRS.gov for a precise estimate.
Can I reduce the setup fee if I cannot afford it?
Yes. You can request a fee reduction or waiver by contacting the IRS directly or submitting Form 656-L. The IRS considers your income and ability to pay. However, approval is not may provide, and you must make the request before setting up the plan.