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You definitely are required to register your home. Those property taxes aren’t going to pay themselves.
But you don’t need a home to vote. We went through a whole period in our early history where only land owners were allowed to vote, and generally only white men. It would be discriminatory to not allow homeless people to vote.
Homeless people can vote in Austria too. But they do have to register separately as such. For everyone else, the government already knows where they live (because we are required to register our residences) and uses that information to compile a voter registry .