Taxes
Everything is a probability except for death and taxes.
Pay your taxes. Or, as Jesus would say, Render unto Caesar.
Tax avoidance is bad. Society needs money to function. Don't be a jerk--hold up your end of the social contract. This means you too, libertarians!
If you think the tax rates are too high, or the money is being misspent, then use democratic means to change the system. It's not up to you to opt out. The fact that some of the money funds things you disagree with is no justification for cheating. This is monetary addiction, not a principled stand against government waste.
If the system is beyond repair, start a revolution.
If the system incentivizes people to use creative accounting and tax havens to avoid paying taxes, then use the levers of democracy to close those loopholes.
A progressive system of taxation is the most utilitarian. The impact on happiness and well-being that taxes have on the poor is vastly more than the impact it has on the rich. The rich are much whinier about it, and own the media so they can whine very loudly, but their quality of life is barely impacted by higher marginal tax rates.