Estimating taxable income, tax liability, and potential refund. Arabella Cunningham is 24 years old and single, lives in an apartment, and has no dependents. Last year she earned $55,000 as a sales representative for Planning Associates; $3,910 of her wages was withheld for federal income taxes. In addition, she had interest income of $142. She takes the standard deduction. Calculate her taxable income, tax liability, and tax refund or tax owed for 2018.