Indeed, one of the main reasons we have a lower rate of taxation on small business income is to allow business owners to pump the savings back into growing their business. (huffingtonpost.ca)
Solar feed into the grid is realizing a form of taxation by the utility companies in some states.... (nas.org)
Besides, proportional tax (or you could call it flat tax) still puts a higher burden of taxation on the richest. (totalpolitics.com)