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TL;DR:
A US business compliance calendar includes key recurring deadlines: Delaware Franchise Tax (Mar 1), Federal Tax Returns (Mar 15 for S-Corps/Partnerships, Apr 15 for C-Corps), FBAR filing (Apr 15), Delaware LLC Tax (Jun 1), and quarterly estimated tax payments. Forgetting these dates leads to automatic penalties.
Direct Question Answer
What is this about? A summary of the most important annual and quarterly compliance deadlines for a typical US company. Who is it for? Founders and managers of US businesses. When is it relevant? Throughout the year for financial and tax planning.
Decision Summary
Who should act? All business owners must be aware of and plan for these deadlines. Who can ignore? No one. These are mandatory filing dates with legal and financial consequences for missing them.
For a US business owner, staying compliant means navigating a year-long calendar of different deadlines from multiple government agencies. It's not just about one day in April. Forgetting a key state filing in March or a quarterly payment in June can lead to automatic penalties.
This guide provides a high-level overview of the most important compliance dates for a typical US company, focusing on a calendar year-end (December 31).
Key Compliance Dates for 2025
January
15
Q4 2024 Estimated Tax Payment
Final quarterly estimated tax payment due to the IRS for the previous tax year.
31
W-2 and 1099-NEC Distribution
Deadline to send annual wage (W-2) and contractor payment (1099) forms to employees and contractors.
March
1
Delaware C-Corp Franchise Tax
CRITICAL: Delaware C-Corporations must file their Annual Report and pay Franchise Tax. This is a commonly missed deadline with a $200 late penalty.
15
S-Corp & Partnership Tax Returns
Federal income tax returns (Form 1120-S and Form 1065) are due for S-Corps and Partnerships.
April
15
C-Corp Federal Tax Return
Federal income tax returns (Form 1120) are due for C-Corporations. This is also the deadline for foreign-owned SMLLCs to file Form 5472.
15
Q1 2025 Estimated Tax Payment
First quarterly estimated tax payment due for the current tax year.
15
FBAR Filing Deadline
Deadline to file FinCEN Form 114 (FBAR) for US entities with foreign bank accounts over $10,000.
June
1
Delaware LLC Annual Tax
Delaware LLCs must pay their flat $300 Annual Tax.
15
Q2 2025 Estimated Tax Payment
Second quarterly estimated tax payment due.
September
15
Q3 2025 Estimated Tax Payment
Third quarterly estimated tax payment due.
15
Extended S-Corp & Partnership Deadline
Final deadline for S-Corps and Partnerships that filed for a six-month extension.
October
15
Extended C-Corp Deadline
Final deadline for C-Corporations that filed for a six-month extension.
Note: Deadlines for state Annual Reports outside of Delaware (like Wyoming) are typically based on the anniversary month of your company's formation.
Never Miss a Deadline Again
This calendar highlights the complexity of US compliance. It's a year-round responsibility. Our annual compliance service is designed to manage this entire calendar for you. We track every federal and state deadline, prepare the filings, and ensure you are always compliant, so you can focus on your business, not on dates and forms.