D.C. Mun. Regs. tit. 14, § 9112
9112.1 Families shall be required to provide information on household income, assets valued at $25,000 or more and family composition triennially (every three years).
9112.2 Triennial recertification for midmonth move-ins (e.g., September 15th) shall be conducted no later than the third following year by the first of the move-in month (e.g., September 1).
9112.3 When families move to another dwelling unit, the family shall not be required to complete an interim recertification unless the household composition has changed and the family member who was added or removed had income counted in the last triennial recertification. The family rent to owner shall be the TTP calculated using the family's most recent interim or scheduled recertification, together with the utility allowance and contract rent applicable to the new dwelling unit.
SOURCE: Final Rulemaking published at 61 DCR 9596 (September 19, 2014).