Tax Burden Degree as a Tool to Design Tax Systems

This paper explores an integrated taxation system. Taking as a premise the proposals by the Carter Commission Report, we find out that proportional tax is the unique system that allows to neutrally integrate the taxable income. This analysis leads to explore new tax rules combining the extreme cases of `Flat Tax' and `Equalizing Net Income' rules. As a conclusion we suggest the Equitably Compensatory tax rule which accurately combines both extreme principles. Surprisingly enough, this rule coincides with the Proportional rule for societies whose income is not too unequally distributed.