Line 16—Amount Paid with Extension or Tax Return
On this line, enter the total of the following amounts.
• Any amount paid with your request for an extension on Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return; or Form 2350, Application for Extension of Time To File U.S. Income Tax Return.
Also include any amount paid electronically in connection with an extension of time to file, but don’t include the convenience fee you were charged.
• The amount you paid with your original return, regardless of method. Also include any additional payments you made after it was filed. However, don’t include payments of interest or penalties, or the convenience fee you were charged.
Example. You are filing Form 1040-X to amend your 2024 tax return. You sent a check for $1,500 with your original return, reflecting a payment of $1,400 in taxes and a $100 estimated tax penalty/underpayment penalty. When completing Form 1040-X, enter $1,400 on line 16 (the check sent with the original return minus the $100 penalty).
https://www.irs.gov/pub/irs-pdf/i1040x.pdf
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