TPC's Katherine Lim has crunched some numbers on John McCain's proposal to temporarily cut capital gains tax rates from 15 percent 7.5 percent. In 2009, under a plan that lowers taxes on both gains and dividends, those making $1 million or more would get two-thirds of the benefit, and an average tax cut of more than $72,000. Those making less than $50,000 would get, on average, nothing.