A partial payment means you send the IRS money that covers only some of what you owe, not the full amount due on your return.

The IRS accepts partial payments. You do not have to pay everything at once. When you send in less than the total you owe, the IRS records what you paid, applies it to your account, and continues to charge interest and penalties on the unpaid balance until you settle it completely.

How you make a partial payment matters. The method you choose — whether you pay online, by mail, or through a payment plan — affects when the IRS records your payment, how quickly interest starts, and what options remain open to you later. Understanding the mechanics now prevents confusion when your next bill arrives.

Key Takeaways

  • Partial payments are recorded when ready and reduce the amount you owe, but interest and penalties continue to grow on the unpaid balance.
  • You can make a partial payment online through IRS.gov, by phone, by mail, or through an installment agreement that spreads payments over time.
  • Interest accrues daily on unpaid tax at a rate set by the IRS each quarter, currently compounded daily.
  • A failure-to-pay penalty of 0.5% per month applies to any balance you do not settle by the original due date, separate from interest charges.
  • If you cannot pay in full soon, an installment agreement or offer in compromise may lower what you ultimately owe or give you more time.

How the IRS records and applies your partial payment

When you send money to the IRS, they post it to your account in the order the payment arrives. If you owe $5,000 and send $2,000, your balance drops to $3,000. The IRS applies the payment first to any penalties, then to interest, then to the original tax amount — though this order can shift depending on the type of tax and the payment method you used.

The timing of when your payment posts matters. If you pay online or by phone, the IRS records it the same day. If you mail a check, it may take 5 to 7 business days to reach the IRS processing center and post to your account. During that gap, interest continues to accrue on the full amount you owe. Always include your Social Security number or employer identification number and the tax year on any payment you send by mail so the IRS can match it to the right account.

Interest and penalties on unpaid balances

The IRS charges two separate costs on money you do not pay by the due date: interest and penalties. Interest is calculated daily on whatever balance remains unpaid. The IRS sets the interest rate each quarter; it is currently in the range of 8% to 9% per year, though this changes. Interest compounds daily, meaning you pay interest on the interest that has already accrued.

The failure-to-pay penalty is 0.5% of the unpaid tax for each month or part of a month the tax remains unpaid. If you owe $3,000 and do not pay it for six months, you will owe an additional $90 in penalties alone, on top of the interest. This penalty stops accruing once you have paid in full or entered into a formal installment agreement with the IRS.

If you filed your return late, you may also owe a failure-to-file penalty, which is separate and larger. The failure-to-pay penalty does not explore if you have an active installment agreement in place, which is one reason setting up a plan early can save you money.

Methods for making a partial payment

You have several ways to send money to the IRS for a partial payment. The fastest and most direct is through IRS Direct Pay on IRS.gov, where you can pay from a bank account with no fee. You can also use the IRS2Go mobile app to pay by debit or credit card, though credit card payments charge a processing fee of roughly 1.87% to 2.35% depending on the processor.

If you prefer to pay by phone, call the IRS at 1-800-829-1040 and speak to a representative who can process a payment over the phone. You can also mail a check or money order to the IRS address for your region — the address appears on your bill or on IRS.gov. Never send cash by mail.

For ongoing partial payments over time, an installment agreement is often the better choice. This is a formal plan where you commit to paying a set amount each month until the debt is settled. The IRS offers short-term agreements (120 days or less) with no setup fee, and long-term agreements (more than 120 days) with a setup fee of $31 to $225 depending on how you enroll. Once you have an agreement in place, the failure-to-pay penalty stops growing.

The difference between a partial payment and an installment agreement

A partial payment is a one-time or occasional payment that does not commit you to a schedule. You can send $500 one month and $1,000 the next month with no formal arrangement. An installment agreement is a binding contract where you promise to pay a specific amount on a specific date each month until the balance reaches zero.

The advantage of an installment agreement is that it halts the failure-to-pay penalty once approved. If you know you cannot pay in full for several months, setting up an agreement when ready saves you money in penalties, even if the monthly payment is small. You can set up an agreement online through IRS.gov, by phone, or by mail. The IRS will work with you to find a payment amount you can afford, though they may require financial information to verify your situation.

What to do if you cannot pay the full balance soon

If partial payments will take you many months to clear the debt, explore whether you may have access to for an offer in compromise. This is a settlement where you pay less than the full amount owed, and the IRS forgives the rest. You must show that paying the full amount would create genuine financial hardship. The IRS accepts roughly 1 in 4 offers submitted, so it is not may provide, but it is worth investigating if your situation is severe.

You can also request a currently not collectible status if you are in when ready financial crisis. This temporarily pauses collection action and stops the failure-to-pay penalty from growing, though interest continues to accrue. This status lasts up to 120 days and can be renewed if your situation does not improve. It is not forgiveness — you still owe the full amount — but it gives you breathing room if you are facing eviction, foreclosure, or other urgent hardship.

Before you make any partial payment, contact the IRS or a tax professional to discuss which path fits your situation. A small investment in information now can save you thousands in interest and penalties over time.

Frequently Asked Questions

Does making a partial payment stop interest from accruing?

No. Interest continues to accrue daily on any unpaid balance, even after you make a partial payment. The only way to stop interest is to pay the full amount owed. An installment agreement does not stop interest either, but it does stop the failure-to-pay penalty from growing.

Can I make a partial payment without setting up an installment agreement?

Yes. You can send money to the IRS anytime without a formal agreement. However, if you know you will need months to pay off the debt, an installment agreement saves you money by stopping the failure-to-pay penalty, even though interest still accrues on the balance.

What happens if I miss a payment on my installment agreement?

Missing a payment can cause the agreement to default, and the IRS may resume collection action. Contact the IRS when ready if you cannot make a scheduled payment. They may allow you to catch up or modify the agreement rather than terminate it.

How long does it take for the IRS to post a payment I made online?

Online payments through IRS Direct Pay or IRS2Go post the same day you submit them. Mailed checks take 5 to 7 business days to reach the processing center and post to your account. Interest continues to accrue during this time, so paying online is faster if you want to minimize interest charges.

Can I pay part of my tax bill and ignore the rest?

Legally, yes — the IRS will not force you to pay. However, interest and penalties will continue to grow on the unpaid balance indefinitely. The IRS can also pursue collection action, including wage garnishment or bank levies, if the debt remains unpaid for an extended period. Contacting the IRS to set up a plan is far better than ignoring the bill.