Missourians who buy a car or truck in another state could get a tax break under a recent state Supreme Court ruling. Up to now, you paid sales taxes on vehicle purchases during registration. Now local sales taxes cannot be levied for purchases made in other states, but communities can charge a local use tax if voters approve. Currently, 39 counties and the city of St. Louis have a use tax. How the tax change will affect local governments is unknown, since the state Revenue department doesn’t track revenue from vehicles bought in other states.