Answer:
$0
Step-by-step explanation:
Calculation for how much tax will he owe on the sale
Realized gain= $90,000 - $40,000
Realized gain = $50,000
Despite the fact that the realized gain was the amount of $50,000 , the total amount of $50,000 gain that was Realized on the qualified small business stock that was been acquired in the year 2020 and was withheld for than five years will be excluded from the tax .
Therefore the amount of tax that he will owe on the sale is $0