2026 Tax Filing Deadlines

** Avoid penalty and interest by paying any tax due by or before the original (not extended) due date! **

March 16, 2026
• 2025 S-Corporation (Form 1120-S)
• 2025 Partnership (Form 1065)

April 15, 2026
• 2025 Individual income tax return (Form 1040)
• 2025 C-Corporation (Form 1120) return due (calendar-year)
• 2025 Trust and estate income tax return (Form 1041)
• 2025 IRA and HSA contributions deadline
• Q1 2026 estimated tax payment

June 15, 2026
• Q2 2026 estimated tax payment due

September 15, 2026
• Q3 2026 estimated tax payment
• 2025 Extended S-Corporation and Partnership returns

October 15, 2026
• 2025 Extended individual return (Form 1040)
• 2025 Extended trust return (Form 1041)

December 15, 2026
• 2025 Extended C-Corporation return (calendar-year)