Answer:
Calculate the self-employment tax for 2019 as follows:
Schedule C net income = $144,400
Less: Self-employment adjustment ($144,400 x 7.65%) = $11,046.6
Taxable self-employment earnings = $133,353.40
Self-employment tax rate = 15.30%
Total self-employment tax = $20,403.10
Therefore: the total self-employment tax is $20,403.10