Payroll compliance in the US involves multiple federal and state requirements. Missing deadlines or miscalculating taxes can result in significant penalties. This guide covers everything you need to know about processing payroll correctly.
Understanding Payroll Taxes
Federal Payroll Taxes
| Tax Type | Employee Share | Employer Share | Wage Base (2026) |
|---|---|---|---|
| Social Security | 6.2% | 6.2% | $176,100 |
| Medicare | 1.45% | 1.45% | No limit |
| Additional Medicare | 0.9% | — | Over $200,000 |
| Federal Income Tax | Based on W-4 | — | All wages |
| FUTA (Unemployment) | — | 6.0% (0.6% after credit) | $7,000 |
State Payroll Taxes
Most states require:
- State Income Tax Withholding: Varies by state (9 states have no income tax)
- State Unemployment Insurance (SUI): Employer-paid, rates vary by experience
- State Disability Insurance: Required in CA, NY, NJ, HI, RI, PR
- Paid Family Leave: California, New York, and other states
💡 States Without Income Tax
Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming have no state income tax.
Payroll Deposit Schedules
| Deposit Schedule | When to Deposit |
|---|---|
| Monthly | By 15th of following month (if tax liability < $50,000 in lookback period) |
| Semi-weekly | Wed-Fri paydays: Deposit by Wednesday. Sat-Tue paydays: Deposit by Friday |
| Next-day | If tax liability exceeds $100,000, deposit by next business day |
W-2 vs 1099: Employee vs Contractor
| Factor | W-2 Employee | 1099 Contractor |
|---|---|---|
| Control | Company controls how work is done | Worker controls how work is done |
| Equipment | Company provides | Worker provides own |
| Schedule | Company sets hours | Flexible schedule |
| Tax Withholding | Employer withholds | None (worker pays) |
| Benefits | Often provided | Not provided |
⚠️ Misclassification Penalties
Incorrectly classifying employees as contractors can result in back taxes, penalties (up to 3% of wages), and potential lawsuits for unpaid benefits.
Key Payroll Forms
- W-4: Employee's Withholding Certificate (from employee)
- I-9: Employment Eligibility Verification (within 3 days of hire)
- W-2: Wage and Tax Statement (to employees by Jan 31)
- 1099-NEC: Nonemployee Compensation (to contractors by Jan 31)
- Form 941: Quarterly federal tax return
- Form 940: Annual FUTA tax return
- Form 944: Annual federal tax return (small employers)
Payroll Calendar Key Dates
| Date | Requirement |
|---|---|
| January 31 | W-2s to employees, 1099s to contractors, File Form 940 |
| April 30 | Q1 Form 941 due |
| July 31 | Q2 Form 941 due |
| October 31 | Q3 Form 941 due |
| January 31 | Q4 Form 941 due, Form W-3 to SSA |
Common Payroll Mistakes to Avoid
- Missing tax deposit deadlines
- Incorrect worker classification (employee vs contractor)
- Not keeping proper records for required period (3-7 years)
- Forgetting state-specific requirements
- Miscalculating overtime pay
- Not updating for annual tax changes
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