Excellent article here about how the tax code can be changed.
My personal favourite is the flat tax. Several of the Baltic states have adopted a flat tax and have done really well. A flat tax is the fairest as everyone pays the same portion of their income as taxes and a 0 marginal tax rate does not penalize success or risk taking. Interestingly enough, a flat tax actually increases the tax revenues for the state because firstly there is a strong positive incentive to earn more (the Laffer curve) and there would be fewer people wanting to dodge taxes because they deem it unfair.