Mr. As salary $36,000 Mrs. As Schedule C net profit 41,800 Interest income 1,300 Mrs. As self-employment tax for the year was $5,906. (Note: The self-employment tax is actually net profit x .9235 x .153.) The couple had $4,150 of itemized deductions and no children or other dependents. Compute their income tax on a joint return. (Subtract one-half of the self-employment tax as an above the line deduction.) They use married filing joint tax rates.