Employee underpayment confirmed: remediation, regulator engagement and enforceable undertakings

This guide begins where a wage review ends: the employer has enough reliable evidence to conclude that at least one employee was underpaid. It does not repeat the initial diagnostic method in our wage compliance review guide, or the coverage analysis in our guide to award interpretation and classification. The immediate task is to stop further loss, establish authority and move from finding to payment without turning a preliminary number into a false final answer.

First, correct or temporarily override the live payroll rule before the next cut-off. If the permanent fix cannot be tested in time, use a controlled manual payment or other documented interim control. Confirm who can approve that control and who will check the next two pay runs. Do not wait for the historical exercise while the same error continues.

Second, preserve the record: payroll and time extracts, rosters, contracts, award and agreement versions, classification decisions, system configuration, change logs, leave and super data, pay slips, complaints and relevant correspondence. Suspend routine deletion for material in scope. Create read-only source extracts and record when, by whom and from which system they were taken.

Third, appoint a senior sponsor with authority over funding, scope and communication. Establish decision rights for legal interpretation, methodology, cohort expansion, provisional payments, regulator contact, employee disputes and closure. Include payroll, finance, people, industrial relations, data and tax capability. Where exposure may be material, records are poor, intentional conduct is possible or criminal or personal liability issues arise, obtain specialist legal advice at once. AWS can support remediation governance and analysis but is not a law firm and does not provide legal representation.

A confirmed error does not mean its full extent is known. Write a short issue statement: the entitlement affected, the legal source, the rule applied, the correct rule, the known cohort and period, and the assumptions still open. Use language such as ‘confirmed issue; scope and quantum under validation’ until the population and calculation have been checked.

Reconstruct the law that applied in each historical period. Modern-award rates, allowances and clauses change; enterprise agreements commence and cease; classifications and duties change; annualised arrangements, individual flexibility arrangements and contractual set-off terms may apply differently over time. Do not apply today's rate backwards or assume a current classification describes every past period. The detailed coverage and classification method belongs in the linked classification guide rather than being improvised inside remediation.

Test for connected errors without allowing scope to expand indiscriminately. If the fault is an overtime trigger, ask which entities, pay groups, employment types, locations and rule versions used it, and whether it also changed leave, termination, super or tax outcomes. A complaint about one worker may expose a system rule affecting a cohort. Conversely, do not label every payroll difference an underpayment without checking the governing instrument and lawful offsetting arrangements.

The six-year period commonly discussed for recovery proceedings is not a universal instruction to discard older facts. Section 544 of the Fair Work Act 2009 generally prevents a person applying for certain orders more than six years after the contravention. Employers must generally keep prescribed employee records for seven years under s 535 and the Fair Work Regulations. Different contractual, State, tax, super or unclaimed-money rules may apply. Set scope with legal advice rather than treating ‘six years’ and ‘seven years’ as interchangeable cut-offs.

Calculate at worker, pay-period and entitlement-line level. For each period show what was paid, what should have been paid, the difference and the source rule. Keep base wages, overtime, penalties, allowances, leave, termination amounts and other entitlements separate. Reconcile the line-level result to payroll totals, bank files and the general ledger so that duplication and omitted off-cycle payments are visible.

Version-control the methodology. Record instrument versions, rate tables, rounding rules, time assumptions, treatment of missing data, offsets and any material judgement. Never erase an inconvenient exception from the model. Put it in an exceptions register with an owner and resolution. Where records are incomplete, document the limitation and use a fair, supportable approach informed by advice; poor records can create evidentiary and enforcement consequences and should not be used to shift uncertainty onto workers.

Separate preparation from verification. A person with appropriate industrial and payroll competence who did not build the calculation should test the legal rule, data completeness, representative employee calculations, edge cases and payment output. Systemic or high-value programs may warrant independent specialist verification; that is a risk response, not a universal statutory requirement. The sponsor should approve methodology and material changes, while finance approves funding and payroll release only after verification gates are met.

Maintain an assumptions and decisions log. Each entry should state the question, alternatives considered, source relied on, decision-maker, date, affected population and recalculation consequence. That record is essential when an employee challenges a figure, an auditor re-performs the work or the regulator asks how the amount was derived.

The Fair Work Ombudsman's step-by-step underpayment guidance says employers should work out the affected period, compare gross amounts paid with entitlements, discuss the underpayment and pay outstanding amounts as soon as possible. For a large or complex program, its Payroll Remediation Program Guide provides an employee-centred framework.

Do not hold a reliably calculated, undisputed minimum merely because a residual issue remains. Consider an interim payment clearly labelled as such, without asking the employee to waive an unknown balance. Set payment priorities by worker impact and confidence in the calculation, not convenience. Fund the program early enough that payment approval does not become the critical delay.

Give each affected worker a plain-language statement showing the periods reviewed, entitlement categories, gross back-payment, withholding, net payment, super treatment, any interest or other adjustment, payment date, assumptions material to that worker and a contact for questions. Explain that the worker can provide contrary records and how disputes will be reviewed. Avoid broad admissions beyond verified facts, but do not hide behind legalistic language or minimise the error.

Communications should be sequenced: managers and the response team need an accurate script and escalation route before individual notices issue; representative bodies should be engaged where an instrument or process requires it; and privacy should be protected. Employees should receive their own information, not cohort spreadsheets. Promise only confidentiality that can lawfully and practically be maintained.

Former employees remain part of the remediation population. Use proportionate tracing steps — verified personal email or phone details, secure correspondence to a last known address, professional tracing where justified and a public contact channel that does not reveal who is affected. Authenticate identity and current bank instructions before paying. Keep a trace log, attempts, responses and reasons for escalating or closing each case.

If a former employee cannot be located, do not treat the amount as extinguished. The FWO may hold unpaid wages in some regulatory matters under s 559, and State or Territory unclaimed-money laws may apply in other circumstances. Identify the correct pathway for the employer and jurisdiction with advice. For a deceased worker, establish who is legally authorised to receive estate money; do not pay a relative solely because they make contact.

Build a dispute process with a named reviewer who was not the original calculator where practicable. Log the issue, acknowledge it, request only necessary records, re-perform the relevant periods and give a reasoned answer. Pay any undisputed balance while the disputed component is considered. Preserve the employee's material and the revised calculation rather than overwriting the first result.

A wage back-payment can change PAYG withholding, Single Touch Payroll reporting, superannuation and leave balances, but those consequences do not share one rule. Assign an accounting or tax owner and reconcile their outputs back to the wage register. The ATO's back-payment guidance explains that there is no single STP treatment: reporting depends on the payment, and amounts accrued or payable more than 12 months earlier may be reported as lump sum E. Current STP correction guidance should be applied to incorrect prior reporting.

Super requires a split by payment date, not by when the wages were earned. For employee earnings paid up to 30 June 2026, the ATO's quarterly missed-or-late SG guidance applies: late or insufficient contributions can require an SGC statement and payment of the charge to the ATO. For qualifying earnings paid on or after 1 July 2026 — including a historical wage back-payment made on or after that date to the extent it is qualifying earnings — Payday Super generally requires contributions to reach the fund, with allocable information, within seven business days after payday, subject to specified longer periods. The ATO's first-year compliance approach does not erase the underlying obligation.

Do not pay a super shortfall as cash wages or assume a late fund payment alone resolves every SGC consequence. Obtain current accounting or tax advice, especially where periods cross 1 July 2026. Separately recalculate leave accruals and payments where the corrected hours, ordinary pay or service history affects them, and correct current balances without silently rewriting the historical audit trail.

Sections 535 and 536 of the Fair Work Act and the Fair Work Regulations govern employee records and pay slips. The FWO's record-keeping guidance states that prescribed records are generally kept for seven years, must be accessible, legible and in English, and cannot be altered except to correct an error or be knowingly false or misleading. Preserve the original and create a traceable correction. Issue compliant pay documentation for remediation payments and retain calculation and payment evidence.

Interest is not governed by one universal employer-led-remediation formula. It may be ordered by a court, agreed in an enforceable undertaking, required by an instrument or contract, or adopted as a remediation measure. Determine the legal basis and method with advice, apply it consistently and explain it. Do not imply that paying principal automatically removes exposure to civil penalties, record contraventions, serious-contravention provisions or other orders.

Back-payment is necessary but not a release from enforcement. Courts impose penalties; regulators decide their response under their statutory powers and policy. Keep remediation focused on making workers whole and preventing recurrence, not on manufacturing favourable evidence. A contemporaneous, accurate record of prompt correction and cooperation may be relevant, but it is not immunity.

There is no general rule that every underpayment must be self-reported to the FWO. Make a documented decision after considering scale and duration, number and vulnerability of workers, cause and intentionality, record failures, repeat issues, complaints, public or regulated-sector context, capacity to remediate, and whether the FWO or another regulator is already involved. Check whether another law, licence, funding condition, agreement or governance obligation requires notification.

The FWO's Compliance and Enforcement Policy explains its risk-based approach and treatment of self-reported unintentional non-compliance. Its Payroll Remediation Program Guide explains what employers can expect if they notify. Neither creates a promise that disclosure will avoid investigation, penalties or litigation, and an employer cannot choose its own enforcement outcome.

If contact is made, prepare a verified initial brief: entities and instruments, issue and discovery date, current containment, known and potential population, periods, preliminary quantum clearly qualified, methodology plan, payment timetable, governance, worker communications, data limitations, root cause and corrective controls. Nominate one regulator contact and keep a disclosure log. Correct material errors promptly rather than allowing an optimistic early estimate to harden into the official record.

If a compliance notice has already been issued, follow its terms and deadlines. Our separate guide to responding to a compliance notice addresses review rights, evidence and execution. A remediation program does not suspend a notice or replace legal advice about it.

From 1 January 2025, intentional underpayment can be a criminal offence. The FWO's official guidance distinguishes intentional conduct from honest mistakes. Do not make a casual internal finding that conduct was accidental or intentional before the evidence is assessed. Preserve communications and approvals, stop potentially continuing conduct, limit speculative commentary and obtain criminal and employment-law advice where the threshold may be engaged.

Self-reporting alone does not prevent prosecution. A cooperation agreement is a specific written mechanism for self-reported conduct that may amount to the criminal offence; while it is in force the FWO cannot refer conduct covered by it for criminal prosecution, but civil enforcement remains possible. Small businesses should separately consider the Voluntary Small Business Wage Compliance Code. These are not substitutes for advice or remediation.

Privilege also needs precision. Legal professional privilege depends on the dominant purpose and the circumstances of each communication or document; copying a lawyer does not cloak payroll data, ordinary business records or pre-existing documents. Obtain advice on investigation structure, but continue to preserve factual records and meet payment and legal obligations.

Under s 715 of the Fair Work Act, the FWO may accept a written undertaking in connection with a person's compliance. The FWO describes an enforceable undertaking as an agreement used where an investigation has shown workplace laws were not followed, the employer is prepared voluntarily to fix the issue and agrees to preventative action. The regulator decides whether this is the appropriate outcome and prepares the draft; the employer may provide input and seek independent legal advice.

An EU is not a private settlement, an admission-free certificate or a substitute for back-payment. It is published. Typical terms may include acknowledging contraventions, calculating and paying workers, interest or super where specified, public or workplace notices, apologies, independent audits, training, system improvements, periodic reporting and evidence of completion. Actual terms depend on the matter. The FWO's 2026–27 register shows current examples; it should not be treated as a tariff or a promise that another employer will receive the same outcome.

Acceptance may mean the regulator uses an EU instead of commencing proceedings for the conduct it covers, but employers must analyse the instrument's precise scope and other agencies' powers. Noncompliance is serious: the FWO may apply to a court for orders directing compliance, payment of the Commonwealth's financial benefit from the breach, compensation and other appropriate orders. Assign every term an owner, due date, evidence requirement and escalation trigger before signing.

The board or relevant committee needs a concise, regular view: confirmed and potential workers, gross principal and other components, amounts paid and outstanding, tracing results, disputes, methodology changes, regulator status, control failures, corrective actions and residual risk. Separate confirmed figures from estimates and cumulative payments from remaining provision. Management should record who can revise scope, approve payment, communicate externally and declare closure.

Root cause should reach beyond ‘human error’. Ask why the error was possible and why it persisted: ambiguous accountability for instrument interpretation, no rate-update control, duties drifting without classification review, time data not captured, payroll configuration changed without testing, interfaces dropping fields, annualised arrangements not reconciled, exceptions approved without expiry, complaints closed individually without cohort analysis, or assurance reporting that measured processing rather than legal correctness.

Convert each cause into a control with an owner, frequency and evidence: instrument register and change alerts; classification review triggers; configuration approval and regression testing; roster-to-pay exception reports; annualised-wage reconciliations; complaint-to-cohort escalation; former-worker contact controls; and periodic independent testing. Re-test the corrected payroll over live cycles and a historical sample. Closure requires evidence that workers were paid, records corrected, disputes managed, regulator commitments met and controls operated — not merely that a project meeting declared completion.

Personal exposure for people involved in a contravention is addressed separately in our guide to accessorial liability for advisers and payroll professionals. The practical implication here is that decision records must be candid: do not direct staff to suppress exceptions, alter records or describe an unresolved issue as fixed.

A multi-site services employer confirms that a payroll rule excluded a recurring allowance from an overtime calculation for one award cohort. Within 48 hours it changes the live rule under dual approval, preserves system versions and appoints the CFO as sponsor. Industrial relations validates the historical award clauses and rate changes; data staff identify every pay group using the rule; payroll calculates each worker and period; and a separate reviewer checks the interpretation, population, exceptions and payment file.

The employer pays a verified undisputed amount to current workers first with an itemised statement, while tracing former workers and resolving a small set of time-record exceptions. Tax specialists determine withholding and STP treatment. Super specialists split earnings paid up to 30 June 2026 from qualifying earnings paid from 1 July 2026 and apply the relevant regime. The sponsor records the advised decision on FWO notification rather than assuming disclosure is mandatory or unnecessary.

The root-cause review finds no owner for award-rule changes and no regression test across related pay elements. The board receives fortnightly figures separated into confirmed, paid, disputed and unlocated amounts. New controls assign instrument ownership, require signed configuration testing and trigger cohort review when a pay complaint identifies a rule error. Internal audit re-tests two live cycles and a historical sample before closure. The example illustrates governance, not a prescribed legal timetable or guaranteed regulator outcome.

This guide is based on the Fair Work Act 2009 and Fair Work Regulations 2009 as published on the Federal Register of Legislation; the FWO's underpayment steps, Payroll Remediation Program Guide, record-keeping guidance, Compliance and Enforcement Policy, criminal-underpayment, cooperation-agreement and enforceable-undertaking materials, including its published 2026–27 EUs; and current ATO material on STP back-pay reporting and correction, PAYG withholding, quarterly SGC and Payday Super. Those sources should be checked again when action is taken because rates, guidance and law change.

AWS supports employers with remediation governance, cohort and process mapping, calculation-control design, worker communication planning, root-cause analysis, control uplift and evidence tracking through workplace advisory and compliance and governance, risk and compliance. AWS is a workplace consultancy, not a law firm, and does not provide legal advice or representation. Employers should obtain qualified legal advice on statutory interpretation, privilege, limitation periods, regulator strategy, criminal risk and disputed entitlements, and accounting or tax advice on super and reporting. This article is general information current at 24 September 2026.