U.S. Tax Filing Deadlines and Important Dates in 2025
Feeling stressed over tax deadlines?
Staying on top of important tax dates is essential for managing your business finances and avoiding unnecessary penalties.
At Simplifi Bookkeeping, we’ve got you covered with a clear calendar of key tax deadlines to help you plan and stay compliant.
Find & Download Tax Forms from the IRS:
-
Form 1040
Annual income tax return filed by citizens or residents of the United States.
-
Form SS-4
Application for Employer Identification Number (EIN)
Use this form to apply for an employer identification number (EIN). -
Form W-2
Wage and Tax Statement.
Employers must file a Form W-2 for each employee from whom Income, social security, or Medicare tax was withheld.
Don't see the form you are looking for?
Check out the link below and find the full list of IRS forms for this tax season.
2025 Tax Deadlines
Business - U.S. Resident Entities
March 17
Form 1120-S
Form 1065
Form 8804
Form 8805
April 15
Form 1120
Form 5472
Form 1041
September 15 (extended)
Form 1120-S
Form 1065
Form 8804
Form 8805
October 15 (extended)
Form 1120
Form 5472
Form 1041
April 15: default deadline for calendar year-end corporations.
Does your business need tax assistance?
Never Miss a Deadline!
With Simplifi Bookkeeping, you get expert tax management and personalized support to keep your small business on track all year round