A Beginner's Guide to Running Payroll for Your Small Business

Running payroll for the first time feels like you're supposed to have a license for it. Tax codes, deductions, filing deadlines, employment law — there's a lot of moving parts, and getting one wrong can snowball into penalties and unhappy employees.

The good news: payroll is a process. Once you understand the steps, it becomes routine. This beginner's guide to running payroll for a small business walks you through the fundamentals, whether you have one employee or fifty.

What Does Running Payroll Actually Mean?

Running payroll means calculating what each employee earns in work, calculating what you owe them in pay, and ensuring the correct amounts reach the right people — your employees, your tax authority, and any pension or benefits providers.

In practice, a typical payroll cycle looks like this:

Calculate gross pay (salary, or hours × hourly rate)
Subtract mandatory deductions (income tax, national insurance or social security)
Subtract voluntary deductions (pensions, benefits, salary sacrifice schemes)
Calculate employer contributions (the employer's share of social contributions, pension matching, etc.)
Pay net pay to your employees
Report what you've done to your tax authority
Keep records for the legally required years

The rules vary by country (UK payroll works differently from US payroll, which works differently from Australian payroll), but the structure is essentially the same almost everywhere.

Getting the Basics Right: Registration, Employees, and Pay Frequency

Before you run your first payroll, three things need to happen.

Register as an employer

You must register with your tax authority as an employer before the first payday. In the UK, that means HMRC. In the US, you'll need an Employer Identification Number from the IRS. In other regions, it's a similar process — slightly different forms, same idea.

You'll receive an employer reference number that you'll use for every filing, every year. Write it down. You will need it constantly.

Collect employee information upfront

Every new hire needs to give you certain information before their first payday:

Full legal name and address
Tax ID or social security number
Tax code or withholding status
Bank details for direct deposit
Pension enrolment preferences
Any existing deduction orders (student loans, court orders, etc.)

When building your employment arrangements, clear contracts establish expectations on pay frequency and deductions. Get employee information in writing (or digitally) before day one. A simple onboarding form prevents delays later.

Choose your pay frequency

You have four main options:

Weekly: Common in hospitality and retail. More payroll runs, more admin, but employees love the regular cash flow.
Fortnightly (bi-weekly): A middle ground. Half the admin of weekly, still relatively frequent pay.
Monthly: The standard for salaried staff. One payroll run per month keeps things simple.
Four-weekly: Sometimes confused with monthly, but creates 13 pay periods instead of 12. Pick this by accident and you'll spend a year explaining the discrepancy.

There's no legal requirement to pick one over another, but whatever you choose should be in the employment contract. Changing it mid-year is possible but annoying for everyone involved.

Running a Pay Cycle: Calculation Through Payment

This is where the actual work happens. The good news: it follows the same pattern every cycle.

Calculate gross pay

Gross pay is what the employee earns before any deductions. For salaried staff, it's annual salary divided by pay periods. For hourly workers, it's hours worked × hourly rate.

Don't forget:

Overtime (usually premium rates for hours over the standard threshold)
Bonuses or commissions
Holiday pay or paid time off
Statutory payments (sick pay, parental leave, and so on — these have specific rates that change annually)

For hourly workers, accurate timekeeping is essential. If you're still using paper timesheets or spreadsheets, you're relying on manual accuracy. Timesheet software automates this, which cuts errors and disputes. (Bonus: if you use the right integration, hours feed directly into payroll without re-entry.)

Make deductions

Deductions are where most new employers go wrong, because there are two types and they work differently.

Mandatory deductions (the law requires these):

Income tax: Based on the employee's earnings and tax code. Tax tables or software calculate it automatically — you just apply the number.
Social contributions: Called national insurance in the UK, social security in the US, and various other names elsewhere. Both employee and employer contribute.
Court-ordered deductions: Child support, debt repayment orders, and similar. When a court tells you to deduct money, you deduct it.

Voluntary deductions (agreed between you and the employee):

Pensions: In the UK, you're legally required to offer workplace pensions under automatic enrolment rules. Employees contribute a percentage of pay, and you match or top up. Choosing the right pension provider is worth doing properly upfront.
Health insurance: If you offer it, the employee's share comes out of their paycheck.
Salary sacrifice: The employee gives up a portion of salary in exchange for a non-cash benefit (additional pension, company car, cycle-to-work scheme, etc.).

Get the deduction right or you'll spend the next month correcting it. Over-deduct, and the employee is unhappy. Under-deduct, and the tax authority is unhappy. There's no winning middle ground except "get it right."

Issue payslips and payment

Once net pay is calculated (gross minus all deductions), you pay your employees. Direct bank transfer is standard — it's fast, reliable, and creates a digital paper trail.

Every employee must receive a payslip. This is a legal requirement in most jurisdictions. The payslip shows:

Gross pay
Each deduction (itemized)
Net pay
Year-to-date totals

Good payslips answer 90% of employee questions before they're asked. Poor ones generate confusion and queries.

Staying Compliant: Reporting and Records

After each pay run, you report to your tax authority. In modern systems, this happens in real time — you submit data on or before each payday, not once a year.

Reporting

Your report includes:

Each employee's gross pay, tax, and other deductions
Employer contributions
New starters and leavers

Late or inaccurate reports attract penalties. Payroll software handles this automatically, which is one of the strongest arguments for using it. (Late filing is the payroll mistake that costs money fastest.)

Keeping records

You're legally required to keep payroll records for a minimum period — typically three to seven years depending on your country. This includes:

Payslips and pay data
Tax filings
Employee contracts and personal information
Details of any deductions
Records of statutory payments

Good record-keeping protects you during audits and makes employee disputes easier to resolve. It also makes managing employee benefits much clearer when you have the paper trail.

Common Payroll Mistakes (And How to Avoid Them)

Even experienced employers mess this up. Here are the ones that come up most often:

Missing deadlines: Late filings attract penalties automatically. Set calendar reminders or use software that files for you.
Wrong tax codes: Using the wrong code means deducting too much or too little tax. Update codes whenever they change (the tax authority will tell you).
Benefits in kind: A company car, private health insurance, or phone allowance might affect tax calculations or require separate reporting. Check your local rules.
Statutory payments: Sick pay, maternity pay, and other statutory entitlements have specific rates and rules. Don't guess — look them up (or use software).
Manual entry errors: Spreadsheet payroll is error-prone. A misplaced decimal can overpay or underpay an employee, and fixing it is always harder than getting it right the first time. HR software designed for small businesses eliminates this category of mistake.

Payroll Software: When It's Worth the Investment

If you have more than three or four employees, payroll software is worth the cost. It automates tax calculations, generates payslips, files reports, and keeps records — all of which are time-consuming and error-prone when done manually.

The best systems integrate with your wider business tools. When payroll is connected to accounting, timesheets, and HR records, you eliminate double entry and the risk of data falling out of sync.

Processing your first payroll run is worth doing carefully, whether manually or with software. But if payroll becomes regular (i.e., you have employees), software pays for itself in time saved and errors prevented.

For small businesses specifically, integrated platforms bring payroll, accounting, and workforce management into one system — no juggling subscriptions or manual data transfers between tools.

Frequently Asked Questions

Q: What if I make a payroll mistake? A: Stop immediately, calculate the correct amount, and pay the difference to your employee. Notify your tax authority of the correction. Most jurisdictions have specific processes for payroll corrections — follow yours. The longer you wait, the worse it looks.

Q: Do I need to keep payslips forever? A: No. You need to keep them for the minimum period required by your country (usually three to seven years). After that, you can discard them unless there's an active dispute or audit.

Q: Can I process payroll myself using a spreadsheet? A: Technically, yes. Practically, don't. Spreadsheets are error-prone, time-consuming, and don't integrate with your other tools. If you have even one employee, software will save you more time than it costs.

Q: What happens if I'm late filing payroll to the tax authority? A: Penalties. The amount varies by country, but late filings are treated seriously. Set a calendar reminder or use software that files automatically.

Q: Do I need to offer a workplace pension? A: In the UK, yes — if you have at least one employee who meets certain criteria (age 22 and over, earning above the lower earnings limit). Other countries have similar requirements. Check your local rules.

Q: How often do tax codes change? A: In the UK, annually (usually April). The tax authority will notify you of changes. Update them promptly — using an old code is a common source of errors.

Q: What if an employee has multiple jobs? A: They need to tell you if they have other employment. Tax codes account for this, but you're only responsible for tax on the pay you give them. If they've told their other employer they have a second job, your system should know.

Q: Can I change the pay frequency mid-year? A: Yes, but you need the employee's agreement (it's usually in the contract). Notify them of the change in writing, and be prepared to explain how their pay will be calculated during the transition.