2025 Tax Deadline For 2025 Extension. Extension for victims of 2023 terrorist attack in israel; Deadline will now apply to:
The filing deadline for form 1120 is typically on the 15th day of the fourth month after the end of a corporation’s fiscal tax year. For tax year 2023 (filed in 2025), you needed to submit your tax extension request by monday, april 15—the regular tax filing deadline—or face a penalty.