Calculating payroll taxes correctly is one of the most important — and most error-prone — tasks for any small business. Get it wrong and you face penalties, underpayment notices, or angry employees. This guide walks you through every component of a US employee paycheck in 2026, with a real worked example at the end.
Quick version: Gross pay → subtract pre-tax deductions → apply FIT withholding (Step 2 method) → apply FICA (6.2% SS + 1.45% Medicare) → subtract state income tax → subtract post-tax deductions = net pay. Employer also pays matching FICA + FUTA.
The 5 Components of Payroll Tax
Every paycheck calculation involves five separate tax components. Let's look at each one:
- Federal Income Tax (FIT) — withheld from employee pay based on W-4 elections
- Social Security Tax — 6.2% employee + 6.2% employer
- Medicare Tax — 1.45% employee + 1.45% employer (+ 0.9% Additional Medicare for high earners)
- Federal Unemployment Tax (FUTA) — employer only, 0.6% on first $7,000
- State Income Tax — varies by state (9 states have no income tax)
Step 1: Determine Gross Pay
Gross pay is the starting point before any taxes or deductions. How you calculate it depends on pay type:
- Hourly: Hours worked × hourly rate. Overtime hours (over 40/week) × rate × 1.5
- Salaried: Annual salary ÷ number of pay periods (52 weekly, 26 bi-weekly, 24 semi-monthly, 12 monthly)
- Commission: Base + earned commission for the period
Step 2: Subtract Pre-Tax Deductions
Pre-tax deductions reduce taxable income — they come off gross pay before FIT and state taxes are applied (though FICA still applies to most of them).
- 401(k) Traditional contributions — reduce FIT and state tax, but not FICA
- Health insurance premiums (employer-sponsored) — reduce FIT, state, and FICA
- HSA/FSA contributions — reduce FIT, state, and FICA
- Commuter benefits (up to $315/month in 2026)
Important: Traditional 401(k) deferrals reduce federal income tax but NOT Social Security or Medicare. Health insurance premiums under a Section 125 cafeteria plan reduce all three (FIT + FICA).
Step 3: Calculate Federal Income Tax (FIT)
The IRS provides two methods for withholding FIT: the Percentage Method (automated) and the Wage Bracket Method. The Percentage Method is what payroll software uses. Here are the 2026 brackets:
| Single / MFS Taxable Wages (Annual) | Tax Rate |
|---|
| $0 – $11,925 | 10% |
| $11,926 – $48,475 | 12% |
| $48,476 – $103,350 | 22% |
| $103,351 – $197,300 | 24% |
| $197,301 – $250,525 | 32% |
| $250,526 – $626,350 | 35% |
| Over $626,350 | 37% |
How to apply it (Percentage Method):
- Annualize the gross pay (bi-weekly gross × 26)
- Subtract the standard withholding allowance if the employee claimed it on their 2020+ W-4 (it's $0 for 2020+ W-4 — the allowance system was eliminated)
- Apply the tax brackets to find annual tax
- Divide annual tax by number of pay periods to get per-paycheck withholding
Step 4: Calculate FICA Taxes
FICA stands for Federal Insurance Contributions Act. It covers Social Security and Medicare.
| Tax | Employee Rate | Employer Rate | 2026 Wage Base |
|---|
| Social Security | 6.2% | 6.2% | $184,500 |
| Medicare | 1.45% | 1.45% | No limit |
| Additional Medicare | 0.9% | — | Over $200K (single) |
Social Security wage base: Once an employee's year-to-date wages reach $184,500, Social Security tax stops for the rest of the year. Medicare has no cap.
Step 5: Calculate State Income Tax
State income tax withholding depends on the employee's work state and the state's tax rates. Key notes:
- No state income tax (2026): Alaska, Florida, Nevada, New Hampshire (only on interest/dividends), South Dakota, Tennessee, Texas, Washington, Wyoming
- Flat rate states: Colorado (4.4%), Illinois (4.95%), Pennsylvania (3.07%), Utah (4.85%)
- Progressive states: California (up to 13.3%), New York (up to 10.9%), Minnesota (up to 9.85%)
Virginia example: 4 brackets — 2% on first $3,000, 3% on next $2,000, 5% on next $12,000, 5.75% on over $17,000 annually.
Step 6: Employer-Only Taxes
In addition to matching the employee's FICA, employers pay:
- FUTA (Federal Unemployment): 6% on first $7,000 wages per employee, reduced to 0.6% if state UI taxes are paid on time. Maximum $42/employee/year at the credit rate.
- SUTA (State Unemployment): Varies by state and employer experience rating, typically 2–8% on the first $7,000–$38,000 of wages
Real Example: Bi-Weekly Paycheck Calculation
Let's calculate a complete paycheck for a Virginia employee earning $75,000/year, filing Single, with $200/period health insurance deduction and 5% 401(k) contribution.
Employee: Jane Smith — Bi-Weekly Paycheck (Period 14 of 26)
Annual salary$75,000
Gross pay (÷26)$2,884.62
− Health insurance (pre-tax, Section 125)−$200.00
− 401(k) contribution (5% of gross, pre-tax)−$144.23
FICA taxable wages (gross − health only)$2,684.62
FIT taxable wages (gross − health − 401k)$2,540.39
Federal income tax (annualized → bracketed)−$328.46
Social Security (6.2% × $2,684.62)−$166.45
Medicare (1.45% × $2,684.62)−$38.93
Virginia state income tax (est. 5.4% effective)−$137.18
Net Take-Home Pay$2,013.60
Employer Cost for Same Paycheck
Gross wages paid$2,884.62
Employer SS match (6.2%)$166.45
Employer Medicare match (1.45%)$38.93
FUTA (0.6% on $7,000 annual, split by period)$1.62
True Employer Cost$3,091.62
Common Payroll Tax Mistakes
- Forgetting the SS wage base: Stop withholding Social Security once YTD wages hit $184,500
- Applying FICA to exempt deductions: Section 125 health premiums are exempt from FICA; traditional 401(k) is not
- Using the wrong pay period divisor: Bi-weekly = 26, not 24 (that's semi-monthly)
- Missing state withholding: Employees who work in a different state than they live in may owe taxes to both states (reciprocity agreements can help)
- Late deposits: Payroll tax deposits have specific deadlines (next business day for large employers, monthly or semi-weekly for smaller ones)
Payroll Tax Deposit Schedule (2026)
The IRS assigns a deposit schedule based on your lookback period (total taxes reported in the 12 months ending June 30 of the prior year):
- Monthly depositor: Taxes < $50,000 — deposit by the 15th of the following month
- Semi-weekly depositor: Taxes ≥ $50,000 — Wednesday payrolls due Friday, Friday payrolls due Wednesday
- Next-day rule: If you accumulate $100,000 or more in taxes on any day, deposit the next business day
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