C Corporation Tax Deadlines in District of Columbia
Federal and state filing dates, extensions, and estimate schedules for 2026.
District of Columbia filing deadline
Calendar-year due date follows federal timing for corporations.
Due: Apr 15, 2026
Extension: Oct 15, 2026
Form: State corporate income tax return
Estimated payments
Estimated payment dates: Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Dec 15, 2026.
Due: Apr 15, 2026
FAQ
Does District of Columbia require C Corporation estimated payments?
Estimated payments are scheduled for Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Dec 15, 2026.
Where can I file District of Columbia C Corporation taxes?
Use DC Office of Tax and Revenue resources at https://otr.cfo.dc.gov for forms and filing instructions.