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At the heart of it is this: The real 'burden' of a tax is not measured by how much is taken, but by how little is left. If I take $5 million from a billionaire, he's hardly going to notice; if I take $500 from someone living paycheck to paycheck, there's a very real chance it will cause problems for you. This is why, for instance, medieval "poll taxes" (fixed prices, like 'one shilling a head') are considered the most regressive form of taxes. As my brother puts it, people don't buy eggs in percentages.
Another merit that Joe Sixpack at times seems to not even recognize the existence of is that our current system is built on the conceit that everyone pays the same taxes on the same dollars. I pay the same percentage of my first $5000 in the year as Donald Trump did: nothing. Increasing the percentage of a given tax bracket only skims more money out of the stack of bills that actually falls in that range. This is what makes upper-class tax cuts such a grotesquely ridiculous subject: who really cares how much money a CEO has to pay the government from the top half of his income, when the bottom half is still more than 90% of the country has before taxes? If you were the richest man in the country before taxes, you'll be the richest man in the country after taxes, and the absolute last man in the country with a right to complain about them.
On the practical side of things ... if we shift to a flat percentage tax, we can imagine a point on the income scale where the old and new tax curves intersect — in other words, where that percentage happens to match what individuals with that income were paying before. Everyone above that point is paying less money than before; everyone below that point pays more. In other words, moving to a flat tax, regardless of where it's set, has to amount to a break for the people who by definition are least in need of "relief" from taxation, and an extra burden on those most in need of extra money to keep. Good job there, Sparky.
Not to put too fine a point on it, but the progressive margin system (the basis of our current income tax)remains the best option yet proposed: • In practical terms, it's better because you can't squeeze blood from a turnip — the money has to come from where the money is. • In ethical terms, it's better because it is actually the wealthiest sector that represents the highest degree of stagnation in the economy (if you increase your net worth, then by definition you took more money OUT of the dollarstream than you put back IN), and thus merit the greatest degree of any 'punishment’ inflicted by taxation. • In moral terms, it's better because it distributes the "suffering" of taxation to those most insulated against it (as I alluded to in the first paragraph). Once more: The burden of a tax is measured not by how much is taken, but by how little is left.
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