Individual Income Tax Return (Form 1040) Filing Deadline: April 15, 2026. Extended filing deadline (file extension using Form 4868): October 15, 2026. The FBAR (FinCEN Form 114) filing deadline coincides with the federal income tax return due date. An automatic 6-month extension is allowed, generally until October 15. Partnerships (Form 1065): March 16, 2026 (extended deadline: September 15, 2026), or the 15th day of the third month after the end of the partnership
