Sole Proprietorship Tax Deadlines in District of Columbia
Federal and state filing dates, extensions, and estimate schedules for 2026.
District of Columbia filing deadline
Business income reported on DC personal return.
Due: Apr 15, 2026
Extension: Oct 15, 2026
Form: Form D-40 / D-40B
Estimated payments
Estimated payment dates: Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Jan 15, 2027.
Due: Apr 15, 2026
FAQ
Does District of Columbia require Sole Proprietorship estimated payments?
Estimated payments are scheduled for Apr 15, 2026, Jun 15, 2026, Sep 15, 2026, Jan 15, 2027.
Where can I file District of Columbia Sole Proprietorship taxes?
Use DC Office of Tax and Revenue resources at https://otr.cfo.dc.gov for forms and filing instructions.