Which reform measure could voters use if they wanted to change a law about taxes?

Voters could use a ballot initiative to change a law about taxes. This reform measure allows citizens to propose new legislation or amendments to existing laws, which can then be placed on the ballot for public vote. If the initiative garners enough support from voters, it can lead to the enactment of the proposed tax changes. Alternatively, voters could also pursue a referendum to challenge and potentially repeal an existing tax law.