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How to Set Up Payroll for Small Business: A 2025 Step-by-Step Guide

Modern desk with payroll software, tax documents, and calculator for small business payroll setup.

Running a small business? Payroll is the backbone of your team’s trust—and one IRS mistake can cost you $1,000+ per employee in penalties. But don’t panic! We’ll walk you through setting up payroll flawlessly, even if you’re a first-timer.

Key Takeaways

  • Obtain an Employer Identification Number (EIN) first.
  • Classify workers correctly: W-2 employees vs. 1099 contractors.
  • Automate with payroll software (costs $20–$100/month) to avoid tax errors.
  • Stay compliant with federal, state, and local tax filings.
  • 92% of small businesses using payroll software reduce errors by 50%+ (Source: Deloitte).

Step 1: Get Your Employer Paperwork in Order

A. Obtain an Employer Identification Number (EIN)

An illustrated man holding a document labeled ‘Employer Identification Number (EIN)’ in front of an IRS building.

What It Is:
An EIN is a unique 9-digit tax ID for your business, required to hire employees, open a business bank account, and file taxes.

How to Apply:

  1. Online: Visit the IRS EIN Assistant.
    • Complete the interview-style form (15–20 minutes).
    • Receive your EIN immediately via PDF.
  2. By Fax/Mail: Submit Form SS-4 (1–2 weeks processing).

Common Pitfalls:

  • Sole Proprietors: You can use your SSN, but an EIN protects against identity theft.
  • Multiple Businesses: Each LLC or corporation needs a separate EIN.

Example:
Sarah runs a bakery with two locations. She needs separate EINs for her LLC and a new food truck business.

B. Register with State and Local Agencies

State Requirements:

  1. State Tax ID: Register with your state’s Department of Revenue (e.g., California’s EDD).
    • Purpose: Withhold state income tax and pay unemployment insurance (SUTA).
  2. New Hire Reporting: Submit employee details to your state’s workforce agency within 20 days of hiring.

Local Permits:

  • City Business Licenses: Required in cities like Seattle and Phoenix.
  • Occupational Taxes: Some counties (e.g., Fulton County, GA) charge annual fees.

Action Steps:

  1. Use the Small Business Administration (SBA) local tool to find requirements.
  2. Check county/city websites for specific forms.

Costs:

  • State Registration: $50–$300 (one-time).
  • Local Permits: $25–$500 annually.

C. Classify Workers Correctly

W-2 Employees vs. 1099 Contractors:

FactorW-2 Employee1099 Contractor
ControlSet hours, tools, and methodsChoose how/when to work
TaxesEmployer pays 7.65% FICAContractor pays 15.3% self-employment tax
BenefitsEligible for health insurance, 401(k)No benefits required

IRS Guidelines:
Use the IRS 20-Factor Test to avoid misclassification.

Penalties:

  • Federal: 50–50–5,000 per misclassified worker.
  • State: California’s AB5 law imposes stricter tests (fines up to $25,000).

Example:
Mike hired a graphic designer to create logos. Since he didn’t control her hours or tools, she’s a 1099 contractor.

Step 2: Collect Employee Documents

1. Form W-4 (Federal Tax Withholding)

2025 Updates:

  • New Field: “Multiple Jobs” section for spouses or secondary incomes.
  • Tax Credits: Employees can claim dependents or education credits.

How to Fill:

  • Step 4(a): Additional income (e.g., freelance work).
  • Step 4(b): Extra withholding (e.g., bonuses).

State Equivalents:

  • Form W-4 Equivalent:
    • California: DE 4
    • New York: IT-2104

Storage:

  • Keep forms for 4 years post-employment (IRS requirement).

2. Form I-9 (Employment Eligibility)

Documents Accepted:

  • List A: Passport, Permanent Resident Card (proves identity + work eligibility).
  • List B + C: Driver’s license (B) + Social Security card (C).

Process:

  1. Employee completes Section 1 by their first day.
  2. Employer verifies documents and completes Section 2 within 3 days.

Remote Hiring:

  • Use authorized reps (e.g., notaries) to inspect documents via video.

Penalties:

  • Paperwork Errors: $230–$2,292 per violation.
  • Knowingly Hiring Undocumented Workers: Up to $25,000 per employee.

Ensure every employee submits a completed W-4 and I-9 form during the onboarding process to stay compliant.

3. State-Specific Forms

StateFormPurpose
TexasForm TW-4State income tax withholding
PennsylvaniaPA REV-419Local Earned Income Tax (EIT)
OhioIT-4School district tax withholding

Action Steps:

  1. Visit your state’s Department of Revenue website.
  2. Provide employees with state-specific forms on their first day.

4. Direct Deposit Authorization

Requirements:

  • Written Consent: Employees must sign a form authorizing deposits.
  • Account Details: Collect routing and account numbers (use encrypted software).

Alternatives:

  • Pay Cards: Prepaid cards for unbanked employees (check state laws).
  • Paper Checks: Required in states like Rhode Island, which mandates check payment if direct deposit is refused.

Example:
Emily’s café uses Gusto to store encrypted direct deposit details, reducing check-printing costs by 80%.

Step 3: Choose a Payroll Schedule

Federal and State Laws

  • Federal Fair Labor Standards Act (FLSA): No federal mandate, but states set rules.
  • State Penalties:
    • California: Salaried employees must be paid at least twice monthly.
    • New York: Manual workers must be paid weekly.

2025 Changes:

  • Colorado: New law requires semi-monthly pay for all industries (effective Jan 1, 2025).

Pay Schedule Options

ScheduleProsCons
WeeklyPreferred by hourly workersHigh processing fees
BiweeklyConsistent cash flow (26 pay periods)Overtime calculations can be complex
SemimonthlyAligns with bills (24 pay periods)Pay dates vary (e.g., 15th and 30th)
MonthlyLow administrative effortCash flow strain for employees

Best Practices:

  • Hourly Workers: Weekly or biweekly.
  • Salaried Employees: Semimonthly.

Transitioning Schedules:

  1. Notify employees 30 days in advance (required in CT, CA, and NY).
  2. Adjust payroll software settings to prorate salaries.

Example:
After switching from monthly to biweekly, Jake’s landscaping business saw a 40% drop in late-time tracking submissions.

Holiday and Weekend Pay Dates

  • Weekends: Pay employees the last business day before (e.g., Friday for a Sunday due date).
  • Holidays: Process payroll 2–3 days early (banks may delay deposits).

State-Specific Rules:

  • Massachusetts: Requires payment within 6 days of the pay period end.
  • Texas: No strict deadline, but consistency is legally binding.

Step 4: Calculate Gross Pay and Deductions

A. Hourly Employees

Formula:

Example:

  • Employee: Works 45 hours at $20/hour.
  • Calculation:
    • Regular pay: 40 hours × $20 = $800
    • Overtime pay: 5 hours × ($20 × 1.5) = $150
    • Total Gross Pay: $950

State Overtime Variations:

  • California: Daily overtime (1.5× after 8 hours, 2× after 12 hours).
  • Colorado: Overtime after 12 hours/day or 40 hours/week.

Tools:

B. Salaried Employees

Formula:

Copy

Example:

  • Annual Salary: $60,000
  • Biweekly Pay: $60,000 ÷ 26 = $2,307.69
  • Semimonthly Pay: $60,000 ÷ 24 = $2,500

Exempt vs. Nonexempt:

  • Exempt: No overtime (must earn ≥ $35,568/year, per 2025 FLSA rules).
  • Nonexempt: Eligible for overtime (common for salaried roles under $35,568).

C. Deductions Breakdown

1. Federal Income Tax:

  • Use IRS Publication 15-T and the employee’s W-4 to calculate withholding.
  • 2025 Tax Brackets:
Single FilersMarried (Joint)Tax Rate
$0 – $11,600$0 – $23,20010%
$11,601 – $47,150$23,201 – $94,30012%
$47,151 – $100,525$94,301 – $201,05022%

2. FICA Taxes:

  • Employee Pays: 7.65% (6.2% Social Security up to $168,600 wage base + 1.45% Medicare).
  • Employer Pays: 7.65% (matching).

3. State/Local Taxes:

  • No Income Tax States: TX, FL, NV (but may have other taxes like TX franchise tax).
  • High-Tax States: CA (1–13.3%), NY (4–10.9%).

4. Voluntary Deductions:

  • Health Insurance: Premiums for employer-sponsored plans.
  • Retirement: 401(k) contributions (e.g., employee defers 5% of $2,500 = $125.

Sample Pay Stub:

EarningsAmountDeductionsAmount
Regular Hours (40)$800.00Federal Tax$89.00
Overtime (5)$150.00State Tax (CA)$45.00
Total Gross$950.00Medicare$13.78
401(k) Contribution$47.50
Net Pay$754.72

Step 5: Choose Payroll Software

Top 2025 Payroll Tools

SoftwareCostBest ForKey Features
Gusto$40 + $6/employeeStartups & small teamsAuto-tax filing, health benefits, time tracking
QuickBooks$30 + $5/employeeBusinesses using QuickBooksSeamless accounting sync, project tracking
ADP Run$25 + $5/employeeScaling businesses (50+ employees)HR tools, compliance alerts, multicounty tax support
Paychex Flex$39 + $5/employeeIndustries with complex labor lawsOSHA reporting, background checks

Why Automate?

  • Avoid Penalties: Software auto-files Forms 941, 940, and W-2s.
  • Multi-State Compliance: Handles local taxes in all 50 states (e.g., NY’s Paid Family Leave).
  • Employee Self-Service: Workers access pay stubs and W-2s via portals.

Integration Options:

  • Time Tracking: TSheets, Homebase.
  • Accounting: Xero, FreshBooks.
  • Benefits: Zenefits, Rippling.

Step 6: Run Payroll and Distribute Payments

1. Input Data

  • Hourly Employees: Upload timesheets (CSV or software-integrated clock-ins).
  • Salaried Employees: Verify no changes unless raises/bonuses apply.

2. Review Deductions

  • Pre-Tax Deductions: Health insurance, 401(k).
  • Post-Tax Deductions: Garnishments, union dues.

3. Approve Payments

  • Direct Deposit: Process 2–3 days before payday (banks take 1–2 days to clear).
  • Check Printing: Use security features (watermarks, tamper-proof paper).

4. Save Records

  • Digital Backup: Use encrypted cloud storage (Dropbox, Google Drive).
  • IRS Requirements: Keep payroll records for 4 years, including:
    • Timecards
    • Pay stubs
    • Tax filings

Common Errors:

  • Missed Deadlines: Set calendar reminders for paydays and tax due dates.
  • Overpaid Employees: Use software to claw back via future paychecks.

Direct deposit is the most efficient way to pay employees securely and ensure timely payments.

Step 7: File Taxes and Reports

Federal Filings

FormPurposeDeadline
Form 941Quarterly federal tax returnLast day of next month (e.g., Jan 31 for Q4)
Form 940Annual unemployment taxes (FUTA)January 31
Form W-2Employee wage and tax statementJanuary 31
Form 1099-NECNon-employee compensation (contractors)January 31

E-Filing:

  • Use the IRS FIRE System for forms 941/940.
  • Penalty for late W-2s: 50perform∗∗iffiled≤30dayslate;upto∗∗50perform∗∗iffiled≤30dayslate;upto∗∗290/form after August 1.

State Filings

  • SUTA (Unemployment Taxes): Rates vary by state and claims history (e.g., 0.5–6% in TX).
  • PA Unemployment: File quarterly via UCMS.

Local Taxes:

  • Philadelphia Wage Tax: 3.79% for residents, 3.44% for non-residents (file monthly).
  • Denver Occupational Tax: $5.75/month per employee.

Step 8: Stay Compliant

1. Annual Compliance Tasks

  • Update Posters: Download free federal/state labor law posters from the DOL.
  • Renew EIN: Not required (EINs are permanent).
  • Verify Employee Classifications: Audit 1099 contractors annually using IRS guidelines.

2. Tax Rate Updates

  • Social Security Wage Base: Increases yearly (2025: $168,600).
  • State Unemployment Rates: Check updates via your state’s workforce agency (e.g., NY DOL).

3. Training and Audits

Penalties to Avoid:

  • Late Tax Payments: 2% penalty if paid 1–5 days late; up to 15% after 16 days.
  • Incorrect W-2s: $290 per form if errors aren’t corrected within 30 days.

Final Checklist for 2025

  1. ✅ Confirm EIN and state tax IDs are active.
  2. ✅ Classify all workers correctly (W-2 vs. 1099).
  3. ✅ Set up payroll software with tax auto-filing.
  4. ✅ Train staff on timesheet submissions and deadlines.
  5. ✅ Mark federal/state tax due dates on calendars.

By mastering these steps, you’ll ensure seamless payroll operations, avoid costly fines, and keep your team paid accurately and on time. 🚀

FAQs

  • Monthly: If taxes withheld are $50,000+/year.
  • Semiweekly: If taxes exceed $100,000+/year.

Register in each state where employees work and comply with local tax laws.

Modern desk with payroll software, tax documents, and calculator for small business payroll setup.

How to Set Up Payroll for Small Business: A 2025 Step-by-Step Guide

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