Final answer:
The marginal tax rates for a single taxpayer after the Tax Cuts and Jobs Act of 2017 range from 10% to 37%, and not the 39.6% that was in effect previously. It's important to note that capital gains tax rates may differ and are generally lower than ordinary income tax rates.
Step-by-step explanation:
The ordinary tax brackets and capital gains tax rates vary based on income level, marital status, family size, and other factors. Under current law, as revised by the Tax Cuts and Jobs Act of 2017, the marginal tax rates for a single taxpayer range from 10% to 37%, not the previously higher rate of 39.6%. These marginal tax rates reflect the tax due on all yearly income, with higher-income households facing higher marginal tax rates. However, it's essential to differentiate between ordinary income tax rates and capital gains tax rates, as the latter might have different percentages, typically lower than ordinary income tax rates.