If the nation decided tax laws for you and you are following the law's intention, I'd say there's nothing unethical about it. If you can call up a senator and

If the nation decided tax laws for you and you are following the law's intention, I'd say there's nothing unethical about it. If you can call up a senator and say "You had better increase standard deduction to $X for married couples in Montana with three kids and a small business, or I'll have to rethink my campaign contribution," and you happen to be married in Montana with three kids and a small business, I'd say it's clearly unethical. I think companies like Google fall in the latter category.