Voting is a human right and nobody will give up that right, especially since people have not had that right for years under Apartheid.
Well, hypothetically speaking, non tax payers can still vote, but those votes may not influence national decisions.
They may vote for decisions affecting only a small area in their community, it may not affect a whole city or town.
Political leaders may still be chosen to serve a bigger area, but those leaders must meet the criteria and tasks set out by national government (elected by the tax payers). Should they fail, national government takes over until the next local voting season. Imprisonment is also an option for leaders who failed to meet the needs of the people and instead only inriched themselves. All their business, and direct family business must be sold and the money given towards funding for the local area during national government rule.
Giving a smaller area of responsibility will see them changing their thinking as they will be able to see the progress in neighbouring areas. Etc. Etc.
Hypothetically speaking.