Answer:
Currently (assuming a 2020 tax schedule), Campbells tax liability = $47,367.50 + [35% x ($438,000 - $207,350)] = $128,095
municipal bonds are not taxed by the federal government, so Campbell will not pay any taxes on the interests earned on the State of New York bonds.
if he earns an additional $16,900, then his tax liability will be:
$47,367.50 + [35% x ($454,900 - $207,350)] = $134,010
his marginal tax rate = 35%
