Mrs. Singer owns a profitable sole proprietorship. For each of the following cases, use Schedule SE, Form 1040, to compute her 2021 self-employment tax and her income tax deduction for such tax.

Required:

1. Compute 2021 self-employment tax and the income tax deduction for such tax if Mrs. Singers net profit from Schedule C was $51,458. She had no other earned income.
2. Compute 2021 self-employment tax and the income tax deduction for such tax if Mrs. Singers net profit from Schedule C was $51,458, and she received a $110,000 salary from an employer.
3. Compute 2021 self-employment tax and the income tax deduction for such tax if Mrs. Singers net profit from Schedule C was $51,458, and she received a $155,000 salary from an employer.