To pay an amended tax return, file Form 1040-X and send the additional tax the same day using IRS Direct Pay, an electronic funds transfer, a debit or credit card, or a check made out to “U.S. Treasury.” The payment is a separate step from filing the form, and speed matters: the failure-to-pay penalty and daily interest have been running since the original April due date of the return you’re correcting, and they only stop when the tax hits the IRS.1Internal Revenue Service. File an Amended Return
Pay the Same Day You File
Form 1040-X shows the additional tax you owe, but that number isn’t your full bill. Because penalties and interest run from the original due date of the return being amended, not from the day you file the 1040-X, the meter has been running the whole time.1Internal Revenue Service. File an Amended Return If you’re correcting a two-year-old return, two years of daily compounding are already baked in.
Don’t try to add estimated penalties and interest to the form itself. The IRS calculates those separately and sends a bill after the amended return is processed.1Internal Revenue Service. File an Amended Return Your job is to get the underlying tax to the IRS as quickly as possible, because that’s what stops the compounding.
Payment Methods
IRS Direct Pay
For most people making a one-time payment on a 1040-X, Direct Pay is the simplest option. It pulls funds from a checking or savings account at no cost. Select “Amended Return” as the payment type, then choose “1040-X” as the form and enter the tax year you’re amending.2Internal Revenue Service. Types of Payments Available to Individuals Through Direct Pay You’ll get immediate confirmation the payment was submitted.
If the IRS has already assessed the balance and sent you a notice, use “Balance Due” or “Payment Plan/Installment Agreement” instead of “Amended Return” when you make a follow-up payment.2Internal Revenue Service. Types of Payments Available to Individuals Through Direct Pay
Debit Card, Credit Card, or Digital Wallet
The IRS accepts card and digital wallet payments through two authorized processors, Pay1040 and ACI Payments. Both charge convenience fees the IRS doesn’t share in. Debit card payments run a flat $2.10 to $2.15 per transaction. Credit card fees run 1.75% to 1.85% of the payment amount, with a $2.50 minimum.3Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet On a $5,000 payment, the credit card fee alone would be roughly $87 to $92. If you go the card route, a debit card is dramatically cheaper.
Paying through tax software when you e-file the 1040-X routes through additional processors at slightly different rates.4Internal Revenue Service. Pay by Debit or Credit Card When You e-File
Check or Money Order
Make the check or money order payable to “U.S. Treasury.” Write your name, address, daytime phone number, Social Security number, the tax year you’re amending, and “Form 1040-X” on the payment itself. Don’t staple or paper-clip the payment to the return.5Internal Revenue Service. Pay by Check or Money Order Mail the payment with your 1040-X to the address in the form’s instructions, which varies by state.
Paper takes the longest to process and doesn’t give you instant confirmation. Certified mail is worth it for the delivery record.
EFTPS
The Electronic Federal Tax Payment System is free and secure, but it requires enrollment that takes several business days.6Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System Unless you already have an account, the setup lag makes it a poor fit for a single amended-return payment.
What the Final Bill Will Include
Two charges stack on top of the extra tax: the failure-to-pay penalty and statutory interest. Both accrue from the original April due date of the return you’re amending.
Failure-to-Pay Penalty
The penalty is 0.5% of the unpaid tax for each month or partial month the balance is outstanding, capped at 25% of the unpaid amount.7Internal Revenue Service. Failure to Pay Penalty Under an approved installment agreement, the rate drops to 0.25% per month.8Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges If you ignore an IRS notice of intent to levy and don’t pay within 10 days, the rate doubles to 1% per month.
Interest
Interest compounds daily on the unpaid tax at the federal short-term rate plus three percentage points, reset each quarter.8Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges For the second quarter of 2026 (April through June), the individual underpayment rate is 6%.9Internal Revenue Service. Quarterly Interest Rates Interest has no cap and runs until the balance reaches zero. Paying the underlying tax now is the only way to stop it.
If You Can’t Pay in Full
File the 1040-X anyway. A separate failure-to-file penalty stacks on top of everything else, so holding the form back to avoid a bill you can’t cover only deepens the problem. The IRS offers structured payment options that reduce penalty rates and keep the account out of collections.
Short-Term Payment Plan
If your combined tax, penalties, and interest come to less than $100,000, you can request up to 180 days to pay in full through the IRS Online Payment Agreement tool. There’s no setup fee.10Internal Revenue Service. Online Payment Agreement Application Interest and the reduced failure-to-pay penalty keep running during the window, but you skip installment setup costs.
Long-Term Installment Agreement
For balances under $50,000, you can apply online for a monthly installment agreement of up to 72 months.11Internal Revenue Service. IRS Payment Plan Options – Fast, Easy and Secure You can also apply by phone, mail, or in person using Form 9465.12Internal Revenue Service. About Form 9465, Installment Agreement Request Setup fees depend on how you apply and whether you authorize direct debit:
- Direct debit, applied online: $22
- Direct debit, applied by phone or mail: $107
- Other payment methods, applied online: $69
- Other payment methods, applied by phone or mail: $178
- Low-income taxpayers: setup fee waived for direct debit agreements; $43 for other methods, which may be reimbursed
Direct debit pays off twice: the setup fee is lowest, and the IRS automatically drops the monthly failure-to-pay penalty to 0.25% once the agreement is in place.13Internal Revenue Service. Payment Plans Installment Agreements
Offer in Compromise
An Offer in Compromise lets the IRS accept less than the full amount, but it isn’t a shortcut around a balance you could pay through installments. The IRS evaluates income, expenses, and assets to set the minimum it will accept, and you must be current on all filings and estimated payments before applying. Low-income applicants (household income at or below 250% of federal poverty guidelines) are exempt from the application fee.14Internal Revenue Service. Topic No. 204, Offers in Compromise
Requesting Penalty Relief
Penalties aren’t always final. First-time penalty abatement is the most common route, and it applies if you filed on time and paid on time for the three prior tax years. You can request it by phone or in writing; no special form is needed for the request itself.15Internal Revenue Service. Penalty Relief
If you don’t qualify for first-time abatement, you can request reasonable-cause relief based on circumstances like serious illness, a natural disaster, or reliance on bad professional advice. Form 843 is the formal claim, with the box checked for penalty abatement due to reasonable cause. If you’ve already received an IRS notice about the penalty, the notice may include its own instructions that make Form 843 unnecessary.16Internal Revenue Service. Instructions for Form 843 Interest is almost never abated and keeps running while a penalty request is pending.
Don’t Forget the State Return
A federal amendment often changes your state tax liability too, and most states require an amended state return within a set window after the federal change.17Internal Revenue Service. Topic No. 308, Amended Returns Deadlines, forms, and payment channels vary by state, so contact your state tax agency soon after you file the federal 1040-X. Paying the IRS does nothing for a state balance, and states run their own penalty and interest clocks.