
Oct. 15, 2026 Extension Deadline: Last-Days Checklist for Form 4868 Filers (Thursday, October 15, 2026) | YCL CPA
Extended your 2025 federal return? It is due Thursday, October 15, 2026, with no second extension. A last-days checklist from IRS guidance: missing K-1s and foreign forms, payment options, penalties, and a day-by-day plan.
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