What type of tax structure is the "fairest." What, if any, alternative tax structure would you propose to replace the federal income tax?

'Fair' is really subjective, anyone will have their own opionion.

But i think the best way to define fair is if the tax structure give the same amount of weight throughout all economic classes

If i can replace the federal income tax structure, i would just give a straight percentage of amount to all economic classes, without anyway to cut with 'tax deductible tricks', like 20 % of annual income to all classes of economy. I