These payments would be payments made for filing an extension of the tax return or 2025 estimated tax payments made. You may not have either of these. If you don't it's ok to leave it blank.
These are the lines in question and the descriptions from the Instructions.
Line 20 of Form 8379
In column (a), include any payments shown on your joint return. These payments will be reported on Form 1040 or 1040-SR, line 26, and Schedule 3 (Form 1040), line 10.
Line 10 of Schedule 3
Line 10 Amount paid with request for extension to file (see instructions)
Description
If you got an automatic extension of time to file Form 1040, 1040-SR, or 1040-NR by filing Form 4868 or by making a payment, enter the amount of the payment or any amount you paid with Form 4868. If you paid a fee when making your payment, don’t include on line 10 the fee you were charged. Also, include any amounts paid with Form 2350.
Form 1040
Line 26 2025 estimated tax payments and amount applied from 2024 return
Description
Enter any estimated federal income tax payments you made for 2025. Include any overpayment that you applied to your 2025 estimated tax from your 2024 return or an amended return.
Click here for Instructions to Form 8379.
Click here for Schedule 3.
Click here for Form 1040.
Click here for instructions to Form 1040 (includes instructions for Schedule 3).
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