Question 1

How does the ADP paycheck calculator work?

Accepted Answer

ADP's paycheck calculation applies federal and state tax withholding tables to your gross pay, then subtracts pre-tax deductions (401k, health insurance, FSA/HSA), FICA taxes (6.2% Social Security + 1.45% Medicare), and any post-tax deductions. This calculator mirrors that logic with 2025 tax brackets and FICA rates.

Question 2

What is the Social Security wage base for 2025?

Accepted Answer

For 2025, the Social Security wage base is $176,100. You pay 6.2% in Social Security tax on earnings up to this amount ($10,918 max). Medicare tax at 1.45% applies to all earned income, with an additional 0.9% surtax on earnings above $200,000 for single filers.

Question 3

How does my 401(k) contribution reduce my taxes?

Accepted Answer

Traditional 401(k) contributions are pre-tax, meaning they reduce your federally taxable income dollar-for-dollar. If you contribute $6,000/year and your marginal rate is 22%, you save $1,320 in federal taxes alone. Plus, many states exclude 401k contributions from state income tax as well.

Question 4

What does employer match mean for my real compensation?

Accepted Answer

Employer matching is essentially a guaranteed 50–100% return on your investment. If your employer matches 50% up to 6% of salary, and you earn $60,000, contributing $3,600 (6%) gets you $1,800 from your employer — a 50% return before the money is even invested. Always contribute enough to get the full match.

ADP Paycheck Calculator