The main problem with a revenue tax is margins. If you apply the same rate of taxes to all companies with the same revenue, regardless of their margins you hav

The main problem with a revenue tax is margins. If you apply the same rate of taxes to all companies with the same revenue, regardless of their margins you have your choice of putting all low margin business out of business by assessing a tax higher than they can pay (to collect reasonable revenues from the high margin businesses), or leaving a lot of cash on the table in high margin industries (which as a tax authority you probably don't like).