The skyline of Chicago. Illinois is considering a millionaires tax to alleviate some of the country's highest property taxes.Tom Williams/CQ Roll CallIllinois residents will vote on a 3% tax for millionaires in November.The governor says the tax could generate $4.5 billion annually and alleviate high property taxes.Illinois has the second-highest property taxes in the US.Voters in Illinois will decide in November whether to add a special tax on people who make $1 million or more.