10. Mrs. Singer owns a profitable sole proprietorship. For each of the following cases, use a Schedule SE, Form 1040, to compute her 2020 self-employment tax and her income tax deduction for such tax. 4.4 b. M C. A Mrs. Singer net profit form Schedule C was $51,458. She had no other earned income. Mrs. Singer's net profit from Schedule C was $51,458 and she received a $100,000 salary from an employer. Mrs. Singer's net profit from Schedule C was $51,458 and she received a $145,000 salary from an employer.