Form 4868 Extends Time to File—Not Time to Pay
Form 4868 moves your 2025 Form 1040 filing date to October 15, 2026—it does not extend the April payment due date. Unpaid tax generally accrues interest; a ~90% paid-by-due-date path in the Form 4868 instructions can limit failure-to-pay during the extension, but interest may still apply.
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