Political Parties Act Article 31
Eligibility shall remain unchanged for legislators-at-large and legislators residing overseas who were selected according to party-list proportional representation in national legislative elections by political parties that have undergone a merger. Vacant offices shall be filled according to the prepared list of the political party to which the office holder belonged prior to the merger and according to the order in which said list was prepared.If an individual party that is involved in a party merger fails to attain the proportion of the total vote stipulated in Paragraph 1, Article 22, that party shall not be eligible for a subsidy, regardless of whether the combined total votes of the merged parties satisfy said stipulated proportion.