# Key tax dates for Atlas companies

All Atlas companies are incorporated in Delaware and are considered domestic United States companies. Atlas companies will owe Delaware franchise taxes (for C-corps) or annual fees (for LLCs) and must file federal taxes for each year after forming, unless they choose to dissolve the company. Companies may have annual tax and compliance obligations in other states they do business.
Below are the Delaware and federal tax due dates that apply to all Atlas companies.
Many companies have additional state and federal filing obligations in addition to those listed below. [Atlas partners](https://dashboard.stripe.com/atlas/perks) can help companies understand in which states outside Delaware they have tax and compliance obligations. Our tax and accounting partners can help companies file their taxes and track additional requirements specific to the company’s operations.
## Key filing dates for all Atlas companies
It’s a good idea to mark your calendars for the following filing dates! Atlas will email you with reminders and additional resources in advance of key deadlines for Delaware filings and federal tax filings.
* February 2, 2026: Deadline for employers to distribute W-2 forms to employees and 1099 forms to independent contractors for the previous tax year.
* March 1, 2026: Delaware Franchise Tax filing due for Atlas C-corps (including subsidiaries).
* April 15, 2026: Deadline for federal income tax filing (or to file form 7004 for a 6 month extension).
* June 1, 2026: Delaware Annual Fee filing due for Atlas LLCs.
* October 15, 2026: Deadline for federal income tax if you filed an extension in April.
* December 31, 2026: Deadline for making any year end tax deductions and contributions.
## Common filing dates for companies operating in New York and California
Many startups may also need to register for business in New York or California (our partners can help you [determine if you need to register](https://dashboard.stripe.com/atlas/perks)). For companies registered in these states, see additional key dates below.
* March 2, 2026: San Francisco Business Tax filing due (any companies that conduct business in San Francisco).
* April 15, 2026: New York state franchise tax for C-corps.
* April 15, 2026: California state franchise tax for C-corps.