Payroll 101: How It All Works

Payroll is one of the most important things a business gets right. Your team depends on being paid accurately and on time, and getting it wrong creates problems with employees, with agencies, and with your books.

This guide walks through how payroll processing works from start to finish so you understand the whole process, whether you run it yourself or hand it off. If you are newer to payroll altogether, this is the place to start.

What Payroll Actually Means

Payroll is the process of calculating what your employees earn, subtracting the required withholdings, and paying them the remaining amount on a set schedule. It also includes keeping accurate records of every pay run and the taxes you withhold.

It sounds simple until you are in the middle of it. Pay schedules, overtime, withholdings, new hires, departures, each cycle has moving parts that need to be handled consistently. That consistency is what separates payroll that runs quietly from payroll that creates problems.

The Payroll Process Step by Step

Every pay run follows the same core sequence, whether you have one employee or fifty. The scale changes, but the steps do not.

1. 1Collect hours and pay details. Gather timesheets or salary information for every employee for the pay period. Confirm pay rates, overtime hours, bonuses, and any changes since the last run.
2. 2Calculate gross pay. Figure out total earnings for each employee, including regular hours, overtime, bonuses, or commissions. This is the starting point for every paycheck.
3. 3Subtract withholdings. Calculate and subtract tax withholdings and any other deductions from gross pay. This includes federal, state, and local taxes plus voluntary deductions like retirement contributions.
4. 4Determine net pay. What remains after withholdings is the net pay each employee takes home. This is the amount that lands in their bank account or on their check.
5. 5Process payments. Pay employees by direct deposit or check on your scheduled payday. Confirm every payment goes to the right person for the right amount.
6. 6Keep records. Record every detail of the pay run so your payroll records stay accurate and complete. Good records protect you if questions come up later.

Gross Pay vs Net Pay

Gross pay is the total amount an employee earns before any deductions. Net pay, sometimes called take home pay, is what they actually receive after taxes and other withholdings are taken out. The difference between the two is the withholdings, and getting those right is one of the most important parts of payroll.

How Payroll Withholdings Work

Withholdings are amounts taken from an employee's gross pay to cover taxes and other obligations. Common withholdings include federal income tax, Social Security and Medicare taxes, state income tax where applicable, and any voluntary deductions like retirement contributions.

The amounts depend on the employee's filing status, allowances, and pay. Getting them right matters because too little withheld means a surprise bill later, and too much means the employee is lending money to the government interest free. The employer also owes employer portions of certain payroll taxes on top of what is withheld from the employee.

Choosing a Pay Schedule

Your pay schedule is how often you run payroll. The common options are weekly, biweekly, semimonthly, and monthly. Each has tradeoffs for your cash flow and for your team.

Weekly and biweekly are common for hourly employees because they match how hours are tracked. Semimonthly and monthly are common for salaried roles. Some states have requirements about how frequently certain employees must be paid, so check what applies to you.

Keeping Payroll Records

Every pay run creates records you need to keep: pay rates, hours, gross pay, withholdings, and net pay for each employee. Good payroll records protect you if questions come up later and keep your bookkeeping accurate, because payroll is one of the biggest expenses on your books.

Retention requirements vary by jurisdiction, but plan to keep payroll records for several years at minimum. If you outsource payroll, your provider should keep these records organized and accessible. If you run it yourself, build a system that stores every pay run in a way you can find later.

Common Payroll Processing Mistakes

• Running payroll without reviewing hours first. If your timesheets are wrong, every paycheck that follows is wrong. Review hours and pay details before you calculate, not after.
• Misclassifying employees as contractors. Classification changes what you withhold and what you report. Getting it wrong can lead to back taxes and penalties. When in doubt, get help before you set up a new worker.
• Missing filing and deposit deadlines. Payroll comes with a calendar of deadlines. Missing them can lead to penalties and interest. Build a payroll calendar and review it every pay period.
• Not keeping complete records. Incomplete payroll records make it hard to answer questions later and can create problems at year end. Store every pay run in a way you can find it again.
• Forgetting to update pay rates and withholdings. When an employee gets a raise or updates their withholding form, update your payroll before the next run. Stale details mean wrong paychecks.

Getting Started

Running payroll well comes down to consistency. Set a schedule, collect accurate information each cycle, calculate carefully, and keep clean records. If you would rather hand it off, that is where we come in. For more on what a payroll service handles, see our guide on payroll compliance.