Key federal and Florida deadlines for filing 2026 returns in 2027, and a checklist of what to gather. When a date falls on a weekend or holiday, it moves to the next business day. Always confirm with your preparer — deadlines can change, especially after disaster declarations.
Jan 15
Final installment for self-employed individuals and others who pay estimates.
Feb 1
January 31 falls on a Sunday in 2027, so the deadline moves to Monday, February 1. Also the Florida RT-6 for Q4.
Mar 15
Forms 1065 and 1120-S for calendar-year entities, or file an extension (Form 7004).
Apr 15
Form 1040 and Form 1120, Q1 2027 estimated tax, and last day for 2026 IRA and HSA contributions. Extensions extend filing, not payment.
May 3
Due the first day of the fifth month after year-end. May 1 falls on a Saturday in 2027, so it moves to Monday, May 3. Florida Sunbiz annual reports are due by May 1.
Jun 15
Only two months after the first — it catches many people off guard.
Sep 15
Extended 1065 and 1120-S returns, plus the third estimated payment.
Oct 15
The final deadline for 2026 Form 1040 and Form 1120 returns on extension.
20th
Due the 20th of the month after each reporting period, monthly, quarterly, or annually.
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