Guide
How W-4 Inputs Change Your Paycheck
How W-4 Step 3, Step 4(a), Step 4(b), and Step 4(c) affect take-home pay.
W-4 fields in the calculator
Step 3 credits reduce annual federal withholding. Step 4(a) increases adjusted annual wages. Step 4(b) reduces adjusted annual wages. Step 4(c) adds extra withholding to each paycheck. These fields can materially change take-home pay without changing gross salary.
The calculator uses these W-4 inputs for a withholding estimate only. It does not replace IRS forms, employer payroll setup, or tax advice.