incarcerated in a local, State, or Federal jail, prison, mental hospital, or other institution on the family determination date, and (2) is scheduled to be incarcerated for 6 months or more in the 12-month period following the effective date of the annual registration or the revised registration of said qualified family. (m) Family Determination Date The family determination date is a date assigned to each family by the Secretary for purposes of determining qualified family size and other information necessary for the administration of this chapter. The Secretary shall promulgate regulations regarding the issuance of family determination dates. In the absence of any regulations, the family determination date for all families shall be October 1. The Secretary may assign family determination dates for administrative convenience. Permissible means of assigning family determination dates include a method based on the birthdates of family members. (n) Cross Reference For penalty for filing false rebate claim, see section 504(i). 303. Monthly poverty level (a) In General The monthly poverty level for any particular month shall be one-twelfth of the annual poverty level . For purposes of this section the annual poverty level shall be the sum of— (1) the annual level determined by the Department of Health and Human Services poverty guidelines required by sections 652 and 673(2) of the Omnibus Reconciliation Act of 1981 for a particular family size, and (2) in case of families that include a married couple, the annual marriage penalty elimination amount . (b) Annual Marriage Penalty Elimination Amount The annual marriage penalty elimination amount shall be the amount that is— (1) the amount that is two times the annual level determined by the Department of Health and Human Services poverty guidelines required by sections 652 and 673(2) of the Omnibus Reconciliation Act of 1981 for a family of one, less (2) the annual level determined by the Department of Health and Human Services poverty guidelines required by sections