The Complete Small Business Payroll Guide

Why payroll is harder than it looks

Payroll feels like it should be simple: hours worked, times a rate, minus tax. In practice it sits at the intersection of employment law, tax law and superannuation law, and each layer changes on its own schedule. Most payroll problems in small businesses aren't caused by bad intent — they're caused by a setup decision made years ago that nobody has revisited since. This guide walks through the moving parts so you know what to check and where the authoritative answers live. It's general information, not advice on your specific employment arrangements — for those, the Fair Work Ombudsman and your adviser are the right ports of call.

Start with award coverage, not software

Before any pay run, you need to know which industrial instrument covers each employee. Most Australian employees are covered by a Modern Award — an industry or occupation-based document that sets minimum pay rates, penalty rates, allowances, overtime rules and rostering conditions on top of the National Employment Standards (NES).

The most common payroll failure mode is misclassification: assuming someone is award-free, or paying under the wrong award or classification level. Get coverage right first, because everything downstream — rates, loadings, leave loading, allowances — flows from it. The Fair Work Ombudsman's pay tools will identify the likely award and its current rates; never rely on last year's numbers or a figure someone remembers. We cover this in more depth in our people and payroll services overview.

The compliance layers on every pay run

Each pay cycle, a compliant employer is doing several things at once:

• Gross pay under the correct instrument — base rate, penalties, overtime and allowances per the award or agreement, at the rates currently published by the Fair Work Ombudsman.
• PAYG withholding — tax withheld per the ATO's current tax tables and remitted on the ATO's schedule for your business size.
• Superannuation — calculated at the current rate the ATO publishes, on ordinary time earnings. With the move to payday super, super is aligned to the pay cycle itself rather than a quarterly catch-up, which makes cashflow planning per pay run more important, not less.
• Single Touch Payroll (STP) — reporting each pay event to the ATO on or before payday, through STP-enabled software.
• Record-keeping — time and wage records kept for the period the Fair Work Act requires, and payslips issued within the required window after payday.

Setting up properly

A clean payroll setup has a few non-negotiables: STP-enabled software connected to the ATO; employee records with tax file number declarations and super choice forms completed before the first pay; each employee mapped to an award classification (with the reasoning written down); and a documented pay calendar. If you're registering as an employer for the first time, the ATO's employer registration steps cover PAYG withholding registration and STP onboarding.

Casuals, part-timers and contractors

Employment type changes the rules. Casuals attract a loading in place of certain leave entitlements and have specific conversion rights; part-timers usually need agreed patterns of hours; and the contractor-versus-employee question is decided by the substance of the relationship, not the invoice. Both the ATO and the Fair Work Ombudsman publish guidance on the distinction — worth reading before you engage anyone as a contractor, because getting it wrong creates back-pay, super and tax exposure at once.

The mistakes that cost the most

• Set-and-forget rates. Award rates change at least annually. Check the Fair Work Ombudsman's current rates every time the award updates, and after every classification or anniversary change.
• Annualised salaries with no reconciliation. Paying a salary doesn't switch off the award. If the underlying award would have paid more in a given period, the shortfall is owed.
• Super calculated on the wrong earnings base — or paid late. Late super triggers the superannuation guarantee charge regime, which is deliberately punitive; the ATO's guidance sets out what counts as on time.
• Nobody owns payroll. When payroll lives in one person's head, errors compound quietly. It's a classic founder-dependency risk.

A simple payroll health check

Once a year, pick two or three employees and reconstruct their pay from first principles: award, classification, current published rate, penalties, super and leave accruals. If your reconstruction matches the payroll system, your setup is sound. If it doesn't, you've found the problem while it's still small. Businesses that treat payroll as part of a connected back office — where rosters, timesheets, payroll and accounting talk to each other — catch these drift errors early rather than at audit time.