Question: how to calculate federal tax payable?
Answer: Step 2 – Calculate Adjusted Gross Income. Next, calculate your adjusted gross income. ... 
Step 3 – Subtract Deductions. ... 
Step 4 – Subtract Exemptions. ... 
Step 5 – Calculate Tax Liability and Subtract Credits. ... 
Step 6 – Determine Taxes Owed or Refund Due.