Small Business Payroll 101: A Complete Beginner's Guide

TL;DR — Quick Answer

Small business payroll means calculating wages, withholding taxes, making deposits, and filing returns on time. Employers pay 6.2% Social Security + 1.45% Medicare on top of employee wages, plus FUTA and state unemployment. Missing deadlines triggers IRS penalties that compound fast.

Get your EIN, register with your state, and choose a payroll system before your first hire
File Form 941 quarterly and issue W-2s by January 31
Total employer FICA burden: 7.65% of each employee's wages

6.2%

Social Security

Employer + employee each

1.45%

Medicare

No wage cap

15.3%

Total FICA

Combined employer + employee

What Is Payroll?

Payroll is the process of paying employees for their work. But it's much more than just writing checks. Payroll encompasses every step from calculating gross wages through depositing taxes with the government and filing annual returns.

Calculate

Gross wages, overtime, deductions

Withhold

Federal, state, and local taxes

Deposit

Taxes with IRS and state agencies

File

Quarterly 941s, annual W-2s, Form 940

The complexity increases with each employee you add and each state where you have workers. That's why many small businesses choose to use payroll software or services rather than managing it manually.

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Payroll isn't just about writing checks. It's a compliance obligation that touches the IRS, your state tax agency, the SSA, and your employees' livelihoods every single pay period.

Getting Started as an Employer

Before you run your first payroll, you need to complete several setup steps. Skipping any of these can delay your ability to pay employees or trigger compliance issues down the road.

Get Your EIN

An Employer Identification Number (EIN) is your business's tax ID. You'll use it on all payroll tax forms and when opening a business bank account. Apply free at IRS.gov/EIN — it takes about 10 minutes and your EIN is assigned immediately.

Register with Your State

You'll need state employer accounts for state unemployment insurance (all states), state income tax withholding (if your state has income tax), state disability insurance (CA, HI, NJ, NY, RI), and any local tax requirements.

Get Workers' Compensation Insurance

Most states require workers' comp insurance for businesses with employees. This covers medical costs and lost wages if an employee is injured on the job.

Choose a Payroll System

Decide how you'll process payroll: manual spreadsheets (cheapest but most error-prone), accounting software with payroll (QuickBooks, Xero), a dedicated payroll service (PAYHROLL, Gusto), or a full-service provider (ADP, Paychex — typically more expensive).

State registrations can take 2-4 weeks to process. Start the registration process as soon as you know you'll be hiring, not the week your first employee starts.

Employee Onboarding Forms

When you hire a new employee, you need to collect several forms before running their first payroll.

Form W-4

Federal withholding elections. Keep on file.

Form I-9

Employment eligibility. Due within 3 days of hire.

State W-4

State withholding form, if applicable.

Direct Deposit Auth

Bank routing and account numbers.

New Hire Reporting

You must report new hires to your state's new hire registry, typically within 20 days. This is a legal requirement that helps child support agencies locate parents. Failing to report can result in fines of $25 or more per occurrence.

Calculating Payroll

Each pay period, you need to calculate pay and withholdings for every employee. Here is the step-by-step process.

Calculate Gross Pay

Hourly employees: Hours worked x hourly rate. Federal law requires 1.5x pay for hours over 40/week for non-exempt employees. Salaried employees: Annual salary divided by the number of pay periods in the year.

Subtract Pre-Tax Deductions

Remove pre-tax contributions before calculating withholdings: health insurance premiums, 401(k) or retirement contributions, FSA contributions, and HSA contributions. These reduce taxable wages.

Calculate Tax Withholdings

Withhold federal income tax (based on W-4 and IRS tables), Social Security (6.2% up to $176,100), Medicare (1.45% plus 0.9% over $200,000), state income tax, and any local taxes.

Calculate Net Pay

Gross pay minus pre-tax deductions minus tax withholdings minus any post-tax deductions equals net pay — the amount your employee takes home.

Line Item	Amount
Gross pay	$3,000.00
Pre-tax 401(k)	-$150.00
Taxable wages	$2,850.00
Federal income tax	-$285.00
Social Security (6.2%)	-$176.70
Medicare (1.45%)	-$41.33
State income tax	-$99.75
Net pay	$2,247.22

Understanding Payroll Taxes

As an employer, you're responsible for both withholding employee taxes and paying your own employer taxes on top of wages. Understanding the split is critical for accurate bookkeeping.

Tax	Employee Pays	Employer Pays
Federal Income Tax	Varies (per W-4)	—
Social Security	6.2% (up to $176,100)	6.2% (up to $176,100)
Medicare	1.45% + 0.9% over $200K	1.45%
FUTA	—	0.6% (first $7,000)
State Unemployment	Some states	1-6%+ (varies)

The $176,100 Social Security Wage Base

For 2026, Social Security tax applies only to the first $176,100 of each employee's wages. Once an employee earns above this threshold, neither the employer nor the employee owes additional Social Security tax for the rest of the year. Medicare has no wage cap.

5 Payroll Mistakes That Cost Small Businesses Money

Avoid the most common tax withholding and compliance errors

Setting a Pay Schedule

You need to decide how often to pay employees. The right schedule depends on your workforce, cash flow, and state requirements.

Schedule	Pay Periods/Year	Best For	Notes
Weekly	52	Hourly workers	More admin work; employees prefer it
Bi-weekly	26	Hourly workers	Most common schedule overall
Semi-monthly	24	Salaried employees	1st and 15th of each month
Monthly	12	Salaried employees	Simplest; may not meet state rules

Check State Requirements

Many states mandate minimum pay frequencies, especially for hourly workers. Some states require weekly or bi-weekly pay and do not allow monthly payroll for non-exempt employees. Verify your state's rules before committing to a schedule.

Paying Your Employees

You have several options for delivering wages. Most modern small businesses use direct deposit, but other methods work depending on your situation.

Method	Pros	Cons
Direct Deposit	Fast, convenient, preferred by employees	Requires bank info; setup time
Paper Checks	No bank info needed; familiar	Slower, higher admin cost, loss risk
Pay Cards	Great for unbanked employees	Potential fees; less common

Pay Stubs Are Required

Regardless of payment method, provide a pay stub showing gross pay, all deductions (itemized), net pay, hours worked (for hourly employees), pay period dates, and year-to-date totals. Most states have specific pay stub content requirements.

Making Tax Deposits

You must deposit withheld taxes and employer taxes with the IRS. The frequency depends on your total tax liability during the IRS lookback period.

Depositor Type	Threshold	Due Date
Monthly	$50,000 or less in lookback period	15th of the following month
Semi-weekly	More than $50,000 in lookback period	Within days of each payroll

Enroll in EFTPS

Federal tax deposits must be made through EFTPS (Electronic Federal Tax Payment System) at EFTPS.gov. You cannot mail checks for tax deposits.

Wait for Your PIN

After enrollment, expect your PIN to arrive by mail in up to 2 weeks. You cannot make deposits until your account is fully activated.

Schedule Payments

Schedule payments online or by phone according to your deposit schedule. Payroll services like PAYHROLL handle deposits automatically so you never miss a deadline.

Penalty Alert

Late tax deposits trigger penalties of 2% to 15% depending on how late the payment is. Deposits made 1-5 days late incur a 2% penalty; 6-15 days late incurs 5%; more than 15 days late incurs 10%. These add up fast with every pay period.

Quarterly Filings

Every quarter, you must file Form 941 with the IRS, reporting wages paid, federal income tax withheld, Social Security and Medicare taxes (employee + employer portions), and tax deposits made.

Quarter	Period	Form 941 Due
Q1	January - March	April 30
Q2	April - June	July 31
Q3	July - September	October 31
Q4	October - December	January 31

Good to Know

You'll also have state quarterly filings for unemployment and income tax withholding. Dates and forms vary by state. Mark all deadlines on your calendar at the start of the year to avoid surprises.

Year-End Requirements

At the end of each year, you have several filing obligations. Missing these deadlines results in penalties per form, per employee.

Issue W-2 Forms (Due January 31)

Provide each employee with a W-2 showing total wages and taxes withheld. File copies with the Social Security Administration (along with Form W-3) by the same deadline.

File Form 940 — Annual FUTA Return (Due January 31)

Report your federal unemployment tax liability for the year. If you deposited all FUTA tax when due, you have until February 10.

File State Reconciliation Returns

Most states require annual unemployment reconciliation and copies of W-2s. Deadlines and forms vary by state.

Issue 1099-NEC Forms (Due January 31)

If you paid any independent contractors $600 or more during the year, send them Form 1099-NEC and file copies with the IRS. For a complete breakdown of how independent contractor payroll works — including self-employment taxes and quarterly estimated payments — see our dedicated guide.

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January 31 is the single most important payroll deadline of the year. W-2s, 1099s, and Form 940 are all due on the same day. Plan ahead or let your payroll service handle it.

Common Payroll Mistakes to Avoid

Even experienced business owners make payroll errors. The most costly mistakes are also the most preventable.

Misclassifying Employees as Contractors

The IRS imposes steep penalties for misclassification, including back taxes, interest, and fines. If you control how, when, and where the work is done, the worker is likely an employee.

Missing Tax Deposit Deadlines

Late deposits trigger escalating penalties from 2% to 15%. Set up automatic deposits or use a payroll service that handles them for you.

Calculating Withholding Incorrectly

Using outdated tax tables or ignoring W-4 updates leads to under- or over-withholding. Both create problems for your employees at tax time.

Failing to Keep Proper Records

The IRS requires you to keep payroll records for at least 4 years. State requirements may be longer. Digital records are fine as long as they are complete and accessible.

Ignoring State-Specific Requirements

Each state has its own rules for withholding, unemployment tax rates, pay frequency mandates, and pay stub requirements. Operating in multiple states multiplies the complexity.

5 Payroll Mistakes That Cost Small Businesses Money

Deep dive into each mistake with real penalty amounts and how to fix them

DIY vs. Payroll Service

Should you manage payroll yourself or use a service? The right answer depends on your experience, team size, and how much you value your time.

Factor	DIY	Payroll Service
Cost	Free (just your time)	$30-100+/month
Time per month	Hours	Minutes
Error risk	High	Low
Compliance updates	You research and track	Automatic
Tax deposits	You schedule via EFTPS	Automatic
Tax filings	You prepare and file	Automatic

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The average small business spends 5+ hours per month on payroll administration. At a typical owner's hourly value, that's often more expensive than a payroll service.
— IRS data

Our Recommendation

Unless you have significant accounting experience and very few employees, a payroll service is worth the cost. The time savings alone justify the expense, and you avoid costly mistakes. PAYHROLL offers simple, affordable payroll for small businesses — see our pricing.

Frequently Asked Questions

Payroll services typically cost $30-$100+ per month depending on the number of employees and features. DIY payroll using spreadsheets is free but takes hours each month and carries a high risk of costly errors. The employer tax burden alone adds roughly 8-10% on top of each employee's gross wages.

Employers pay 6.2% Social Security tax (up to the $176,100 wage base in 2026), 1.45% Medicare tax, 0.6% FUTA on the first $7,000 of each employee's wages, and state unemployment tax at rates that vary by state and experience rating. You also withhold the employee's share of Social Security, Medicare, and income taxes from their paychecks.

You file Form 941 quarterly (due April 30, July 31, October 31, and January 31). Tax deposits are made either monthly or semi-weekly depending on your total liability. Year-end forms (W-2s, Form 940) are due by January 31. State filing frequencies vary.

You need Form W-4 (federal withholding), Form I-9 (employment eligibility verification, due within 3 days of hire), a state W-4 if your state requires one, and a direct deposit authorization form. You must also report the new hire to your state's new hire registry, typically within 20 days.

Unless you have accounting expertise and very few employees, a payroll service is worth the investment. Services handle calculations, tax deposits, filings, and compliance updates automatically. The time savings and reduced penalty risk far outweigh the monthly cost for most small businesses.