Discovered Employee Underpayment? How to Fix It Before Fair Work Does

Discovering that you've underpaid staff is confronting, but it is a fixable problem, and how you respond matters far more than the mistake itself. Regulators, employees and courts all draw a sharp line between businesses that find an error and fix it properly, and businesses that minimise, delay or hope nobody notices.

Step one: establish the full extent before you act

Resist the urge to fix the obvious case and move on. A partial remediation that misses employees or pay periods can look worse than the original error, because it suggests carelessness rather than good faith. Before any money moves, work through every employee who could plausibly be affected, across the whole period the error existed.

For each person, compare what was actually paid against what the correct award classification required at the time. That means checking base rates against the Fair Work pay guides for the relevant classification and period, penalty rates for weekends, public holidays and overtime, award allowances such as meal, travel or uniform allowances, leave accrual and payment, and superannuation on any shortfall. Rates change over time, so use the rates that applied in each pay period, not today's.

For most small businesses this is not a do-it-yourself job. An employment lawyer with payroll expertise, or a payroll provider who works in award interpretation daily, will get the calculation right and give you a defensible methodology. If you later self-report, you want to report everything once, with workings you can stand behind.

Step two: understand your legal position

Australian law has tightened considerably around underpayment. Penalties under the Fair Work Act scale with the seriousness and duration of the conduct, and deliberate underpayment is now treated far more severely than honest error. In the worst cases it can attract criminal consequences. The current penalty framework is published by the Fair Work Ombudsman, and it changes; check their guidance or ask your adviser rather than relying on a figure you read somewhere.

The good news sits in the same framework: voluntary disclosure, prompt back-payment and genuine cooperation are consistently treated more favourably than underpayments uncovered by complaint or audit. Good faith is not a technicality — it is the single biggest lever you control.

Step three: back-pay in full, including super

Pay the entire shortfall to every affected employee, current and former. Former employees still have an entitlement, and tracking them down is part of doing this properly. Superannuation is payable on the underpaid amounts too; where super was short, there is a specific ATO process for late super that involves additional components beyond the missed contribution, so get advice on how to lodge rather than simply topping up the fund. Keep detailed records of how every amount was calculated — those records are your evidence of good faith.

Step four: tell your people honestly

Employees generally respond well to transparency and badly to discovering an error themselves. Explain what happened, how you found it, what each person is owed, when it will be paid, and what you've changed so it won't recur. Put it in writing. An awkward conversation now is vastly better than a Fair Work complaint later.

Step five: decide whether to self-report

Not every small, quickly corrected error needs to be reported, but where the underpayment is significant, long-running or affects many employees, voluntary disclosure to the Fair Work Ombudsman, accompanied by a completed remediation and a plan to prevent recurrence, is usually the stronger position. Make this decision with professional advice, because the framing of a disclosure matters.

Step six: fix the system that produced the error

Underpayments rarely come from malice. They come from a wrong classification chosen years ago, a missed annual wage review, manual spreadsheets, or the simple fact that nobody in the business owns payroll compliance. Whatever the cause here, name it and close it: payroll software configured for the right award, a scheduled check when award rates update, and a clear owner for compliance. If payroll sits alongside a stack of other people obligations nobody quite owns, that's a signal the back office needs proper structure, not just a patch — our guide on systemising your business covers how to build that.

The underpayment is history the moment it's repaid. The system you build afterwards is what determines whether you're ever in this position again.