I think it’s fair that people pay taxes in proportion to how well they’ve succeed in that society, and how much they have to lose if the society functions badly, especially since the people at the top of the wealth scale have the most control over how the society actually works.
How one enforces the tax is a separate question. A taxpayer’s wealth would include his/her worldwide assets so it wouldn’t legally matter where they were located. Of course, there would a practical problem of people putting money in foreign accounts and then denying they have them, a problem that exists today with the income tax as well. Remember the IRS going after people when the U.S. forced the Swiss banks to disclose their U.S. depositors?
I disagree that the government is vastly bloated. If you look at the numbers, social security, Medicare and the like are paid from payroll taxes, not income taxes. About half of all income taxes are spent on the military, veterans’ payments, and gov’t employee retirement benefits.
The amount that is spent on programs people say is waste is actually very small. If you want to cut income taxes by any material amount you have to cut defense spending, which I think most people don’t want to do. That is certainly the area that is most subject to waste and easiest to cut.
Remember that the cost of the Iraq and Afghanistan wars is between $4 Trillion and $6 Trillion dollars or about equal to 100% of ALL income taxes collected from all citizens for three to four years!
Anyone concerned about a bloated government should concentrate their cuts there because that, not domestic programs, is where the money actually has gone and is going.