FairCheckCriminal underpayment › If you find one

What to do if you discover an underpayment

Work through it in order: stop the error so it does not repeat in the next pay run, quantify the full exposure across every affected person and period rather than only the case you found, repay with any interest, document what happened and how you fixed it, change the process so it cannot recur, and only then decide whether to self-report.

Do not start by deciding whether to tell anyone. Two things drive the outcome more than anything else: that you found it yourself, and that you can show what you did about it.

General information for Australian employers, checked against Fair Work Ombudsman guidance on 2 September 2026. This is not legal advice. If there is any realistic prospect the conduct was intentional, get legal advice before you do anything else, including before self-reporting.

Step 1: stop it repeating

The next pay run is the one thing you still fully control. Correct the configuration, rate or classification now so the error does not extend by another cycle. Every additional period adds to the liability and weakens the picture of a business that acted promptly.

Step 2: find out how big it really is

This is the step most often done too narrowly. You found one person, in one pay period. The question is not what that person is owed, it is how far the same root cause reaches.

Fixing the current cycle while leaving four years of the same error unaddressed does not resolve the liability. It postpones it, and it removes your ability to say you dealt with it properly.

Step 3: repay

The wages are a debt, separate from any penalty question. Repay as soon as you reasonably can, including any interest. Prompt rectification is explicitly one of the factors the Fair Work Ombudsman weighs, and for employers with fewer than 15 employees it is one of the factors in the Voluntary Small Business Wage Compliance Code.

Tell the affected employees what happened, what you are paying them and why. It is the right thing to do, and an employee who has been dealt with straightforwardly is markedly less likely to escalate.

Step 4: write it down while you still remember it

This is the step that changes your position and the one people skip. Create a dated file containing:

That last point matters more than it looks. The difference between a mistake and a deliberate act is proved with evidence, and the evidence is a record of reasonable steps taken before anything went wrong.

Step 5: fix the process, not just the number

A repayment closes one incident. It does nothing about the fact that nothing in your systems was checking. Ask what would have caught this earlier and put that in place, whether that is a scheduled review each 1 July, a classification review when roles change, or an independent check on each pay run.

If the same error recurs after you have repaid it once, the story changes from an honest mistake to something harder to characterise that way.

Step 6: decide about self-reporting, with advice

Now, and not before, consider disclosure.

If the underpayment is plainly an honest mistake, the criminal offence does not apply, and your priority is rectification and evidence rather than disclosure. If there is a realistic prospect the conduct was intentional, whether by you or by someone in your business, a cooperation agreement may be worth pursuing.

How cooperation agreements work

An employer, business or individual who voluntarily tells the Fair Work Ombudsman about conduct that could amount to the criminal underpayment offence can request a written cooperation agreement. While it is in force, the Ombudsman cannot refer the conduct covered by it for possible criminal prosecution.

What it doesWhat it does not do
Stops a referral for criminal prosecution of the covered conductStop compliance notices, enforceable undertakings or litigation
Applies to the party that entered itCover other individuals or entities, who need their own agreements
Is assessed case by case, with evidenceAffect the Ombudsman's other powers or its inspectors' powers

Two cautions the Ombudsman itself raises. It encourages independent legal advice before voluntarily reporting that you may have committed an offence, including about the information you provide. And knowingly or recklessly giving false or misleading information during the process can attract a civil penalty and is a serious offence under the Criminal Code Act 1995.

Note also that a small business employer who satisfies the Code cannot enter a cooperation agreement about the same conduct, because the Code protection already covers it.

What not to do

Common questions

What is a cooperation agreement with the Fair Work Ombudsman?

It is a written agreement between the Fair Work Ombudsman and an employer, business or individual who has voluntarily told the Ombudsman they engaged in conduct that may amount to the criminal underpayment offence. While the agreement is in force, the Ombudsman cannot refer the conduct it covers for possible criminal prosecution. Civil enforcement options remain available, including compliance notices, enforceable undertakings and litigation. Each agreement is entered into with one party only, so where several entities or individuals were involved, separate agreements may be needed.

Should you self-report an underpayment to the Fair Work Ombudsman?

It depends on whether there is any realistic prospect that the conduct was intentional, and it is a decision to take with legal advice rather than alone. The Fair Work Ombudsman itself encourages people to seek independent legal advice before voluntarily reporting that they may have committed an offence. Where an underpayment is plainly an honest mistake, the criminal offence does not apply and the priority is rectification and evidence. Where intent is genuinely arguable, a cooperation agreement may be worth pursuing, but the disclosure is real and its consequences should be understood first.

How far back do you need to go when fixing an underpayment?

Far enough to cover the whole error, which usually means back to when the incorrect configuration or classification started. Underpaid wages can generally be recovered through the courts for six years from when the entitlement fell due, and employee records must be kept for seven years, so a review that only covers recent pay periods will understate the exposure. Fixing the current cycle while leaving four years of the same error unaddressed does not resolve the liability, it just delays it.

Step 2 is the one people get wrong

Quantifying the real reach of an error, across everyone on the same configuration and back to when it started, is exactly what FairCheck is built to do, with a dated record of every check for your file. In beta now, with early access opening to the waitlist first.

Join the waitlist What the penalties actually are

FairCheck provides general information about Australian pay rules and does not provide legal advice. Decisions about disclosure and self-reporting carry legal consequences and should be made with independent legal advice. Official information is available from the Fair Work Ombudsman at fairwork.gov.au.