The Patriotic Alliance (PA) has agreed to support ActionSA's mayoral candidate in the hung Laingsburg municipal council in the Western Cape's Central Karoo region.
The agreement follows coalition discussions between the two parties as they seek to establish a governing arrangement in the municipality.
ActionSA emerged as the leading party in the local government elections, securing 26.59% of the vote and three council seats.
The Democratic Alliance (DA) also secured three seats with 25.35% of the vote, while the African National Congress (ANC) won two seats.
The PMC and PA each secured one seat in the 10-member council.
In a statement, the PA confirmed that it would support ActionSA's candidate for mayor, describing Laingsburg as the first agreement to emerge from ongoing discussions between the parties.
However, the proposed coalition arrangement still requires the support of two additional councillors from other parties to secure the numbers needed to govern.
The two parties are continuing engagements as discussions around the formation of coalitions in other municipalities progress.