Paycheck Deductions Explained: Every Line on Your 2026 Pay Stub
Your gross pay is rarely what you take home. Between federal tax, FICA, state tax, 401k contributions, health insurance, and the occasional mystery deduction labeled "MISC," up to 35-40% of your paycheck disappears before you see it. This is what each one means in 2026 and which you can actually control.
The Six Categories of Paycheck Deductions
Every line on your pay stub falls into one of six buckets:
- Federal income tax, withheld based on your W-4 and the 2026 IRS brackets
- FICA, Social Security (6.2% up to $184,500) + Medicare (1.45%, +0.9% over $200K)
- State and local income tax, varies dramatically; nine states have no state income tax
- Pre-tax voluntary deductions, 401(k), HSA, FSA, health insurance premiums
- Post-tax voluntary deductions, Roth 401(k), life insurance, disability premiums, charitable
- Involuntary deductions, wage garnishments, child support, court orders
The first three you mostly can't avoid. The next two you fully control. The last is determined by court order or contract.
Federal Withholding: How the IRS Gets Paid
Federal income tax withholding follows the IRS Publication 15-T methodology. Your employer takes your gross pay, annualizes it (multiplies by pay periods per year), runs it through the 2026 brackets, then divides back to your pay period. The 2026 brackets are 10% / 12% / 22% / 24% / 32% / 35% / 37%, with the standard deduction at $16,100 single / $32,200 joint.
If your W-4 has Step 4(c) extra withholding, that flat amount is added every pay period. If you have qualifying children entered in Step 3, your annualized tax bill is reduced by $2,000 per child before withholding is calculated.
FICA: Social Security and Medicare
FICA stands for Federal Insurance Contributions Act and funds Social Security and Medicare. In 2026, the rates are:
- Social Security: 6.2% on wages up to $184,500 (the wage base limit). Above that, no more Social Security tax for the year.
- Medicare: 1.45% on ALL wages (no wage cap). Plus an Additional Medicare Tax of 0.9% on wages above $200,000 single / $250,000 joint.
Your employer matches the 6.2% Social Security and 1.45% base Medicare, but does NOT match the 0.9% additional Medicare. Self-employed workers pay both halves through SE tax (15.3% combined, with deduction available).
Pre-Tax vs. Post-Tax: The $2,000 Difference
Pre-tax deductions reduce your taxable income before federal tax is calculated. A $5,000 traditional 401(k) contribution at a 22% marginal rate saves $1,100 in federal tax, plus state tax (varies $0-$500) and potentially the FICA savings on the HSA/FSA portion. That same $5,000 in a Roth 401(k) gives you no current tax break, but withdrawals in retirement are tax-free.
Common pre-tax deductions: Traditional 401(k), HSA, FSA, traditional IRA contributions through payroll, health/dental/vision insurance premiums, transit/parking benefits up to $315/month in 2026.
Common post-tax deductions: Roth 401(k), Roth IRA, life insurance over $50,000 (the IRS-required imputed income portion), disability insurance, ESPP contributions, charitable giving via payroll.