Sullivan's wife, Susan, died four years ago. Sullivan is 40 years old, has not remarried, and he maintains a home for his dependent child, Sammy, who is 10 years old. In 2019, Sullivan received $70,000 of salary from his employer and $3,000 of qualified business income from a business investment, and he paid $10,000 of itemized deductions.

Compute the following for Sullivan's 2019 tax return:

Gross income

Adjusted gross income

Taxable income

Tax liability after credits