Outside millage is all other millage requested that is over the 10-mill limit. Outside mills must be voted upon and approved by the majority of the voters in the taxing district where the tax will be levied. Because of H.B. 920 (passed in 1976), there is a cap on the amount of money a levy can collect. That means a levy can collect no more in the future than it collects during the first year it's enacted.