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Edited on Tue Jan-20-04 03:03 PM by Chris
Practically, there is no such thing as regressive tax. At a single tax rate, like a sales tax or any 'flat' tax, the more you make or spend, the more tax you pay. It's linear, not progressive or regressive. A progressive tax is one where the more money changes hands, not only is more tax levied on a flat percentage basis, but an *increasing percentage* of money is collected in taxes. That's the definition, and by that definition, there is no such thing as a regressive tax, where the more money is transacted, the less the percentage tax gets taken out. The thing is, such a decreasing tax rate is absurd both politically and practically, rendering the technical definition of regressive taxation useless and therefore meaningless.
Instead, the common representation of tax regregressivity has come to mean, in practical terms, flat taxation, or more broadly, the flatness of a taxation system. That happens to be very meaningful in practical terms because we recognize the reality of discretionary income, or in economic terms marginal utility. Basically if you make $150k and are taxed $50k you are left with $100k. If your lifestyle means you spend $50k annually for your nice home, new car, long vacation, quality furnishings, etc, you still have $50k left in disposable income for savings, investment, splurges, emergencies, ...
If you make $30k and get taxed at the same rate, $10k, you are left with $20k, the same 2/3 as the $100k of the $150k earner. But the problem is that life's essentials don't scale down linearly. The $30k earner doesn't get to 1) pay $10k in taxes 2) spend $10k on his cheap lifestyle and 3) be left with $10k in descretionary income. Life's basics have a relatively inflexible baseline. If you make $1000 a year, that doesn't mean you live on $300. It doesn't work that way. The $30k-earner, even living at a scrimping $18k, roughly 1/3 of the $150k-earner's $50k lifestyle costs, is left with a mere $2k annually in discretionary income. A tiny 1/15 percentage compared to the 1/3 DI that the $150k earner has even with a three-times more expensive base lifestyle.
That is where the concept of regressivity comes into play in analyzing flat taxation mechanisms: it costs more of a percentage of income just to live, the lower on the income curve you go, which squeezes both essentials and discretion much harder on a percentage basis than for higher-income earnings. If all of life's essentials magically became free - food, shelter, clothing, heat, medicine, transportation, communication, ... - then flat taxation, which still wouldn't be a good idea or fair, could at least be considered in practical terms not to be regressive. But they aren't, so it is.
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