For those filing Form 4868 Application for Automatic Extension of Time To File U.S. Individual Income Tax Return:
You do not have to give a reason for filing Form 4868. There is no space on the brief form for explanations.
"You don’t have to explain why you’re asking for the extension. We’ll contact you only if your request is denied," according to "General Instructions" (page 1) on Form 4868 (
https://www.irs.gov/pub/irs-pdf/f4868.pdf).
Form 4868 comprises two parts.
Part I "Identification" (lnes 1-3) asks for name and address.
Part II "Individual Income Tax" (lines 4-9) asks:
4 Estimate of total tax liability for 2025.
5 Total 2025 payments.
6 Balance due. Subtract line 5 from line 4.
7 Amount you’re paying
8 Check here if you’re “out of the country” and a U.S. citizen or resident.. . . . . . .
9 Check here if you file Form 1040-NR and didn’t receive wages as an employee subject to U.S. income tax withholding.