District of Columbia Real Property Tax Timeline for Calendar Year 2026
January 1, 2026
Date of value for Tax Year 2027 annual assessments.
March 1, 2026
Notices of proposed Tax Year 2027 assessment are mailed.
March 31, 2026
First-half Tax Year 2026 real estate taxes and BID taxes due.
April 1, 2026
Deadline for Tax Year 2027 First Level Appeals.
April 15, 2026
Deadline for filing Tax Year 2027 (CY25) Income & Expense Reports, Rent Rolls, and New Lease abstracts for properties on the mandatory filing list. DC requires electronic submission through its online portal.
September 1, 2026
Deadline for filing Tax Year 2027 Mixed-Use Declarations. DC requires electronic submission through its online portal.*
September 15, 2026
Second-half Tax Year 2026 real estate taxes, BID taxes and vault rent due.
September 30, 2026
Deadline for filing TY26 petitions in D.C Superior Court.
*How to submit a Mixed-Use Declaration:
- From the MyTaxDC homepage (mytax.dc.gov), go to the “Real Property” section (first row, third column), click on “Search Real Property by Address or SSL”, enter the property information, and click search.
- Then click on the property SSL link (in blue, lower left), and go to the “Applications and Actions” tab.
- From there, go to “Property Maintenance” (top left) and click “Submit the Mixed Use Declaration.”