It's for this reason Illinois residents don't buy a car in Wisconsin or another neighboring state with a more advantageous tax structure; you'll get nailed post-haste.
But if you're driving up to buy a few cases of New Glarus beer, chances are you're vastly unlikely (at or nearing 0%) that you'd be held to account for that purchase for Illinois tax purposes.
But if you're driving up to buy a few cases of New Glarus beer, chances are you're vastly unlikely (at or nearing 0%) that you'd be held to account for that purchase for Illinois tax purposes.