Susan and Stan Britain or a married couple who file ajoint income tax return, where the tax rates are based on the taxtable 3.5. Assume that their taxable income this year was$338,000.what is thei which each tax rate takes effect are indexed with inflation, so they change each year. 2. The average tax rates are always below the marginal rates, but in 2020 the average at the top of the brackets 2 answers