In a true freedom society, which we have not achieved yet, nobody would be forced to pay anything they do not agree to. Taxes are part of the feudal system and it is basically a way for the government or monarchy to steal from their citizens. We don't need large governments or pay taxes if individuals govern themselves privately in their communities. So, it is not morally wrong to evade taxes because people should have the right to disperse their own money however they like. If a government forces you to pay taxes, they are stealing from you.