This is exactly where we get into a problem, that being, that when the income tax got started it was only supposed to apply to the veery wealthiest of the wealthy (and at a fairly low rate at that) However, history has shown that once you get that income tax camel's nose under the tent, it just keeps on reaching lower and lower down the income scale at higher and higher rates; The proponents of this latest idea admit they originally wanted to go after everyone making $250,000 and up; how long do you think any rational person believes, that once they got this, they wouldn't try to do that? I certainly don't; these people see taxation as a means of implementing a social policy of redistribution of income and wealth (why do they also love the "Death Tax"-because they hate the idea of anyone inheriting wealth, that's why!)
If you truly want something better, consider a value-added tax. Stop taxing wealth, and incomes, and tax consumption instead. The rich will still pay more of it (they have more to spend), but it gets rid of a lot of the cheating, inefficiency, and tax avoidance that is inherent in the present system, has a far lower cost of compliance and enforcement, and best of all, the people know what they are actually paying for government. It has the added benefit of taxing the "underground economy" those who deal only in cash, illegal income and so on, since when they spend the money they will automatically pay the tax. If the goal is truly funding the government, instead of social engineering, this would work better. Of course, liberals will never go for it; can't use that to appeal to the class resentment, jealousy and hate of their constituents, or try to play the role of Robin Hood.
"So what is a value-added tax, anyway? What it sounds like:
a consumption tax on the 'value added' at each stage of production. Here's how that works: Imagine a $1 loaf of bread you buy from the supermarket with a VAT of 10%.
"You've got a farmer, a baker, and a supermarket in the production chain. The farmer grows the wheat and sells it to the baker. The baker makes a loaf, sells it to the supermarket.
"The supermarket sells the loaf to me. Each link on the production chain pays the government
10% of the price of its product minus 10% of the price it paid for the goods to make that product.
"Ultimately, the government collects a total of 10 cents on the $1 loaf. At the supermarket, I pay the bread price plus the VAT: $1.10."
Conservatives object to the VAT because it's an invisible tax that would enable government to grow bigger.
Liberals complain because its regressive nature hits poor consumers harder than others.
"Of course, a VAT could take years to set up and special interests would carve it up with exemptions, just as they have for the rest of the tax system.
"But there are reasons for both liberals and conservatives to support the VAT. Conservatives want a tax system with a broader base and lower marginal rates.
"Liberals want to protect programs like Medicare and education spending with new taxes that don't overburden lower-income families. A VAT would serve both interests."
Value-Added Tax: What You Need to Know - Derek Thompson - Business - The Atlantic