To pay an amended tax return, file Form 1040-X and send the additional tax to the IRS the same day, ideally through IRS Direct Pay from a checking or savings account. Filing and paying are two separate steps, and the payment is what stops interest and the failure-to-pay penalty, both of which have been running from the original April due date of the return you’re correcting.1Internal Revenue Service. File an Amended Return
Pay the Same Day You File
The additional tax shown on your 1040-X is due immediately. Every day it sits unpaid, daily-compounding interest and a monthly failure-to-pay penalty keep adding to the bill, and both charges run from the original April filing deadline of the return being amended, not from the day you discover the error or file the amendment.1Internal Revenue Service. File an Amended Return If the return you’re fixing was due two years ago, two years of charges are already baked in.
Don’t try to calculate and include penalty and interest figures on the form itself. The IRS computes those separately after processing the amendment and sends a bill.1Internal Revenue Service. File an Amended Return Your job on payment day is to send the underlying tax so the meter stops.
Payment Methods That Credit to a 1040-X
Several channels will route money to the right place. The selections you make inside each tool matter, because that’s how the IRS knows the payment belongs to your amended return rather than the current year’s balance.
IRS Direct Pay
Direct Pay pulls funds from a checking or savings account at no cost and gives immediate confirmation. In the tool, choose “Amended Return” as the payment type and “1040-X” as the form, then enter the tax year you’re amending along with your routing and account numbers.2Internal Revenue Service. Types of Payments Available to Individuals Through Direct Pay For a one-time amended return payment, this is the simplest route.
If the IRS has already assessed the balance and sent you a notice, select “Balance Due” or “Payment Plan/Installment Agreement” instead for later payments.2Internal Revenue Service. Types of Payments Available to Individuals Through Direct Pay
EFTPS
The Electronic Federal Tax Payment System is free and secure, and once enrolled you can schedule payments up to 365 days ahead.3Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System Enrollment takes several business days, so it’s practical only if you already have an account or expect to use it for ongoing federal tax deposits.
Debit Card, Credit Card, or Digital Wallet
The IRS accepts card and digital wallet payments through two authorized processors, Pay1040 and ACI Payments. These processors charge convenience fees. Debit card payments cost a flat $2.10 to $2.15. Credit card payments cost 1.75% to 1.85% of the amount, with a $2.50 minimum.4Internal Revenue Service. Pay Your Taxes by Debit or Credit Card or Digital Wallet On a $5,000 payment, that credit card fee runs $87 to $92. The IRS keeps none of it.
If you e-file the 1040-X through tax software, additional processors may handle the payment at slightly different rates.5Internal Revenue Service. Pay by Debit or Credit Card When You e-File Debit is far cheaper than credit if you go the card route.
Check or Money Order
Make it 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 it to the return.6Internal Revenue Service. Pay by Check or Money Order Mail to the address in the Form 1040-X instructions for your state. Paper is the slowest route and gives you no instant confirmation, so send it by certified mail for a delivery record.
What Gets Added to the Tax You Owe
Two charges stack on top of the unpaid tax, and both have been running since the original April due date.
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 An approved installment agreement cuts the rate 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 and the rate resets each quarter at the federal short-term rate plus three percentage points.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 hits zero. Paying the underlying tax immediately is the only way to stop it.
If You Can’t Pay the Full Balance
File the 1040-X anyway. A separate failure-to-file penalty attaches to the return itself, so withholding the amendment to avoid a bill you can’t cover only compounds the problem. The IRS has structured options that reduce the penalty rate and keep your account out of collections.
Short-Term Payment Plan
If your combined tax, penalties, and interest come in under $100,000, you can request up to 180 days to pay in full with 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 the setup costs of a longer plan. Apply through the IRS Online Payment Agreement tool.
Long-Term Installment Agreement
For balances under $50,000, you can apply online for monthly payments stretched 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 automatic bank debits:
- 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 is worth the minor inconvenience. Beyond the lower setup fee, the IRS automatically reduces the monthly failure-to-pay penalty to 0.25% once an installment agreement is in place.13Internal Revenue Service. Payment Plans Installment Agreements
Offer in Compromise
If you truly cannot pay the full amount through installments, the IRS may accept a lump sum for less than you owe through an Offer in Compromise. It isn’t a shortcut. You won’t qualify if an installment agreement could cover the balance, and the IRS tests your income, expenses, and assets to decide the minimum it will accept. You must also be current on all filings and estimated payments before applying. Taxpayers with 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
Asking the IRS to Remove Penalties
Penalties aren’t always final. First-time penalty abatement is the most common path and applies if you’ve filed and paid on time for the three prior tax years. Request it by calling the IRS or writing a letter; no special form is required.15Internal Revenue Service. Penalty Relief
If first-time abatement doesn’t fit, you can request reasonable-cause relief for circumstances like serious illness, a natural disaster, or reliance on bad professional advice. For a formal claim, use Form 843 and check the box for penalty abatement due to reasonable cause. If the IRS has already sent you a notice about the penalty, that notice may include instructions that make the separate form unnecessary.16Internal Revenue Service. Instructions for Form 843 Interest is almost never abated and keeps running while a penalty request is pending.
Your State Return Likely Needs Amending Too
A change on your federal return often changes your state tax as well, and most states require an amended state return within a set period after the federal change.17Internal Revenue Service. Topic No. 308, Amended Returns Deadlines and forms vary, so contact your state tax agency soon after filing the federal amendment. Skipping this step produces a separate round of state penalties and interest that catches many people off guard.