If they never consume what they saved, they have effectively given it to society anyway.
The idea that a sales tax is regressive (w.r.t income) is simply an artifact of your measurement period. It's strictly speaking a flat tax over the long term, but it becomes regressive for a single individual if you break his lifetime up into year-long chunks and if his income or consumption isn't stable.
tl;dr; do the math, the "sales tax is regressive" meme is silly. Any true regressivity is solely an artifact of progressive income taxes and vanishes when you measure progressivity w.r.t. after-tax income.
Also of note 'charitable' giving is just another form of spending and avoids both sales and income taxes. Feel like Promoting Scientology to dogs? Feel free to avoid paying taxes.
You don't pay sales tax on services. Weathly people spend more of there income on ex maids than poor people.
Poor people spend a larger fraction of their income on doctors than rich people. If you have numbers present them, but singling out a single stereotypically rich category of spending is silly.
Statistically, those in the bottom 20% of income earners spend significantly more of there income on sales tax than the top 50% or top 1% or top 0.1%.
By definition, a sales tax is not regressive w.r.t wealth - dMarginalSalesTaxRate/dWealth = 0. The fact that consumption / wealth goes down up as money is shifted from savings to consumption is simply a mathematical identity and not very interesting. I.e.:
(consumption + 1) / (wealth - 1) > consumption / wealthLiterally the only reason the tax appears regressive in year A is because the act of saving has shifted the taxes to year B > A. This is an artifact of your measurement period and vanishes in the long term.
But people have finite lifespans. When all is said and done, who do you think will have paid more sales tax (and VAT) as a proportion of their total income:
A) Bill Gates
B) Me
Before you answer, please also imagine an alternate world in which Bill Gates isn't so generous, and in which there are no estate taxes.
The other possibility is that some of Bill Gates' money is never consumed. In this case it's effectively a tax of 100% - Gates produced wealth for the world and was never compensated for it.
If the rich escape sales taxes, it's only because they provide benefits to the world without being compensated for it. Complaining about that is pretty silly, as is focusing on sales taxes while ignoring this.
On your other point, I'm not complaining. I was just stating the fact that I will pay more sales tax (as a proportion of my lifetime income) than a richer person like Bill Gates. So, by the common definition of 'regressive tax', sales tax is a regressive tax.
I'm not saying this is good or bad or neutral. Just that it is so, by definition. (BTW I don't like the term regressive tax, because the term 'regressive' sounds intuitively negative.)
http://www.thebigquestions.com/2010/01/27/a-quick-economics-...