Any tax on income is immoral.

When you work you are making a trade: your time for US dollars. Nothing is gained as it is a direct trade. For anyone, state or federal government, to take a share of that without your consent is robbery. The Constitution tried to prevent this because the framers saw a tax on income to be exactly what it is, theft of personal property. They not only knew that it was theft but also realized that it discourages people from being productive.

The only moral and constitutional tax is a voluntary one, like a sales tax. You have the choice not to buy a good or service. If you object to what the taxes collected from a given item will go to, like welfare or farm subsidies, then you have the choice of opting out by not consuming. You do not have to buy gas, but for most the value out weighs the negative so we buy even at current prices. That does not negate the fact that you still have a choice as to whether or not you purchase it.

If a man breaks into your house, holds you at gun point and demands a portion of your weekly wage, what is he? If he demands a share of your wage, but tells you that he is doing so for your own good and for the good of someone you have never met, is he not still a thief? Why then do we allow our government to act as a thief, holding us at gun point, for a share of our wages? No matter how good the intent behind the robbery, it is still robbery.

Stop feeding the looters.