Well that depends on how much is taxed at ordinary tax rates & how much at the lower capital gains rates. Both are taxable income but not at the same rates.Based on my super quick calculation, if someone's taxable income was $210,000 in 2017, their federal taxes were $52,698. 2018 tax on $210,000 of taxable income is $49,189.
So a $3,500 difference based on the reduction in rates. Obviously that's overly simplistic, but $3,500 may just be crumbs to JohnKBA and Nancy Pelosi. To most Americans it's $3,500 they can save for retirement, or spend on restaurants, traveling, golfing, etc. at businesses that will employee hundreds of people.