Paycheck Deductions Explained: FICA, Federal, and State Withholding
Break down common paycheck deductions in plain language with planning-focused examples.
The main lines on a typical paycheck
Most W-2 employees see federal income tax withholding, Social Security and Medicare (FICA), state withholding where applicable, and optional deductions like retirement and insurance. Each line answers a different question: income tax is progressive; FICA is largely flat with wage bases and extra Medicare at higher incomes.
Understanding the difference between taxes and voluntary deductions helps you plan. Pre-tax deductions reduce taxable wages for some taxes but not always for all taxes.
Why gross-to-net is not linear
As gross pay rises, different pieces accelerate at different speeds. Additional income may increase federal withholding faster than you intuit, especially on bonus checks or when overtime spikes a single pay period.
If you want predictable monthly cash flow, align withholding with your actual annual situation using official estimators and revisit elections after major life changes.