ArtK78, on 2015-January-26, 13:02, said:
One of the public policy reasons for taxing capital gains at a lower rate than other income is that capital gains represent many years worth of gain on the value of capital, thus bunching the income in one year - the year of sale. To compensate for the bunching of the income, it is taxed at a lower rate.
How is that "compensation"? First you let it grow tax-free for many years, then when it's sold you tax it at a lower rate. It seems to me that the lower rate compounds the benefit, rather than offsetting it.
I guess you're saying that after many years of growth the gain is likely to be huge, so you'd be hit with a huge tax bill if it were taxed at the normal rate, and we don't want to make selling too painful (an efficient market requires willing sellers as well as buyers). But paying taxes on gains isn't really that painful, since it comes out of the proceeds from the sale (unless you needed most of the proceeds for something else).