Perhaps for us slower readers you could lay out the groundwork, like what personal tax rate, capital gains rate, corporate rate, VAT or other 'equivanlent' consumption tax?
OK, I'm going to demo two hypothetical people (Alice and Bob) under two hypothetical tax regimes, A and B.
Tax regime A is a flat 20% income tax - including interest and capital gains as income. Tax regime B is a flat 20% earned income tax, i.e. it excludes interest and capital gains.
Alice and Bob each earn $1000 at the end of 2010. They can spend some portion of the money now on stuff they want now, or they can save the money in a bank account at 5% interest and spend that money at the end of 2011. Alice chooses to spend all $1000 right now, and Bob chooses to spend $500 now and save $500 for the end of the year (which lets him spend $525 then, for a total of $1025).
Under tax regime A, Alice only actually gets to spend $800 now, so she has an effective tax rate of 20%. Under tax regime B, she still only gets to spend $800 now, so she still has an effective tax rate of 20%.
Under tax regime A, Bob gets to spend $400 now. He gets to save $400, which collects $20 of interest, which itself is taxed at 20% to become $16 of interest. In total he gets to send $400 + $400 + $16 = $816. 100*($1025 - $816)/$1025 = an effective tax rate of 20.39%, which is higher than 20% - Bob is paying a higher proportion of his income than Alice, he's being penalized for saving for later rather than spending all his money at once.
Under tax regime B, Bob gets to spend $400 now. He gets to save $400, which collects $20 of interest, which is untaxed. In total he gets to spend $400 + $400 + $20 = $820. 100*($1025 - $820)/$1025 = an effective tax rate of exactly 20%. Under tax regime B, Bob is not penalized for saving his money for later rather than spending it all at once.
Obviously in this particular example with these specific numbers, the difference looks small, "oh it's only a .39% difference". But this result generalizes - a capital gains tax will always penalize people who save, and with realistic incomes, tax rates, and timescales there is a significant distortion.
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