How to Calculate Payroll Taxes: Complete 2026 Guide
Updated April 2026 · 12 min read
Payroll taxes can feel overwhelming, but they follow a logical, step-by-step process. Whether you're an employee checking your pay stub or a small business owner processing your first payroll, this guide walks you through every calculation with real examples.
Step 1: Start With Gross Pay
Gross pay is the total amount your employer pays you before any deductions. It includes:
- Regular wages or salary — Base compensation for hours worked or annual salary
- Overtime pay — Typically 1.5x regular rate for hours over 40/week
- Bonuses and commissions — May be taxed at supplemental rates
- Tips — Reported tips are subject to payroll taxes
Example: Sarah earns $75,000/year, paid bi-weekly. Her gross pay per period is: $75,000 ÷ 26 = $2,884.62
Step 2: Subtract Pre-Tax Deductions
Before calculating income taxes, subtract pre-tax deductions from gross pay:
- Traditional 401(k) — Reduces federal and state taxable income (but NOT FICA)
- Health insurance premiums — Section 125/cafeteria plan deductions
- HSA contributions — Health Savings Account (pre-tax)
- FSA contributions — Flexible Spending Account (pre-tax)
Example: Sarah contributes $200/paycheck to her 401(k) and $100 to health insurance. Taxable income for federal/state: $2,884.62 - $200 - $100 = $2,584.62
Step 3: Calculate Federal Income Tax Withholding Source: IRS.gov
Federal income tax uses progressive tax brackets. For 2026, the brackets for single filers are (see our complete 2026 tax bracket guide):
| Taxable Income | Tax Rate |
|---|---|
| $0 — $11,925 | 10% |
| $11,925 — $48,475 | 12% |
| $48,475 — $103,350 | 22% |
| $103,350 — $197,300 | 24% |
| $197,300 — $250,525 | 32% |
| $250,525 — $626,350 | 35% |
| Over $626,350 | 37% |
Example: Sarah's annual taxable income after standard deduction ($16,100) and 401(k) ($5,200): $75,000 - $16,100 - $5,200 = $54,100
- 10% on first $11,925 = $1,192.50
- 12% on $11,925 to $48,475 = $4,386.00
- 22% on $48,475 to $54,100 = $1,237.50
- Total federal tax: $6,816.00/year → ~$262.15/paycheck
Step 4: Calculate Social Security Tax (OASDI) Source: SSA.gov
Social Security tax is straightforward: 6.2% of gross wages, up to the wage base of $184,500 for 2026. Learn more about this tax in our OASDI tax explainer.
Example: Sarah's Social Security per paycheck: $2,884.62 × 6.2% = $178.85
Step 5: Calculate Medicare Tax Source: IRS.gov
Medicare tax is 1.45% of all gross wages (no wage cap). An additional 0.9% surtax applies to wages over $200,000 per the Additional Medicare Tax provision.
Example: Sarah's Medicare per paycheck: $2,884.62 × 1.45% = $41.83
Combined FICA (SS + Medicare): $178.85 + $41.83 = $220.68/paycheck
Step 6: Calculate State Income Tax
State income tax varies dramatically. There are three types of state income tax systems:
- No income tax (9 states): Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming
- Flat tax: States like Illinois (4.95%), Colorado (4.4%), and Utah (4.55%) charge a single rate on all taxable income
- Progressive tax: States like California (1-13.3%), New York (4-10.9%), and New Jersey (1.4-10.75%) use graduated brackets
Use our state-specific calculators for exact calculations in your state.
Step 7: Employer Payroll Taxes (For Business Owners)
If you're an employer or self-employed, you also pay:
| Tax | Rate | Base |
|---|---|---|
| Employer Social Security | 6.2% | $184,500 |
| Employer Medicare | 1.45% | All wages |
| FUTA | 0.6% | $7,000 |
| State Unemployment (SUI) | Varies | Varies by state |
Complete Paycheck Breakdown Example
Here's the full picture for Sarah ($75,000/year, single, California, bi-weekly pay):
| Item | Per Paycheck | Annual |
|---|---|---|
| Gross Pay | $2,884.62 | $75,000.00 |
| 401(k) Contribution | -$200.00 | -$5,200.00 |
| Health Insurance | -$100.00 | -$2,600.00 |
| Federal Income Tax | -$262.15 | -$6,816.00 |
| CA State Income Tax | -$112.00 | -$2,912.00 |
| Social Security (6.2%) | -$178.85 | -$4,650.00 |
| Medicare (1.45%) | -$41.83 | -$1,087.50 |
| Net Pay (Take-Home) | $1,989.79 | $51,734.50 |
Common Payroll Mistakes to Avoid
- Confusing pre-tax and post-tax deductions — 401(k) reduces income tax; Roth 401(k) does not
- Forgetting the Social Security wage cap — No SS tax is due on earnings above $184,500
- Ignoring state differences — Moving between states can significantly change your take-home pay
- Not adjusting W-4 after life changes — Marriage, new baby, or new job should trigger a W-4 review
- Overlooking local taxes — Cities like NYC, Philadelphia, and many Ohio cities have additional payroll taxes