District of Columbia Income Tax Withholding Payment and Filing Requirements
Employers in the District of Columbia must conform with these state rules relating to filing income tax withholding returns.
Periodic Returns. Monthly (Form FR-900M) by 20th day of month following month being reported. Quarterly (FR-900Q) on or before the 20th day of the quarter following the period being reported. Annually (Form FR-900A) by January 20 of the year following the end of the reporting period.
Annual Reconciliation Returns. Form FR-900B due by January 31.