What Is Backpay? Meaning & Examples
Backpay is money an employer owes a worker for wages or entitlements that were underpaid, unpaid or paid late. Under the Fair Work Act 2009 (Cth) and the relevant modern award, the employer must pay the shortfall, and you can ask the Fair Work Ombudsman to help recover it.
Backpay can cover base wages, penalty rates, casual loading, overtime, leave payouts and super. This guide explains how backpay works, where it shows up on real jobs and which figures to check.
How backpay works
Backpay starts with a gap between what you were paid and what the award or the National Employment Standards required.
- Compare your payslip with the Fair Work Ombudsman pay guide for your award, classification, age and employment type to confirm that a shortfall exists.
- Work out the period affected, using rosters, timesheets and payslips, so the amount you ask for is based on dates and hours rather than a guess.
- Raise the shortfall with your employer in writing and ask for a reply by a set date, keeping a copy of the message.
- The employer calculates the difference, pays it, and shows it on the next payslip so both sides have a clear record.
- If the employer does not fix it, the Fair Work Ombudsman offers free help through the Fair Work Infoline on 13 13 94.
- Check super as well, because unpaid super is a separate debt that the ATO can pursue at 12% of ordinary time earnings for 2026-27.
Most backpay is simple payroll correction, and a calm written request often settles it before anyone needs a formal claim.
Examples of backpay
These workplace examples show where underpayment, and therefore backpay, usually comes from.
- A construction labourer is still paid last year's award rate after 1 July, so the employer owes the difference for every hour worked since the increase took effect.
- A warehouse casual is paid a flat hourly rate with no 25% casual loading, so the missing loading is owed for each shift in the affected period.
- A cleaning crew works Sunday shifts at ordinary rates, and the employer owes the weekend penalty difference once the award is checked.
- An office worker on an annual salary regularly finishes late, and the salary turns out to be less than the award minimum once overtime is counted.
- A worker finishes up and the final pay leaves out unused annual leave, which must be paid out when employment ends.
Backpay rules and key numbers
Use this table to check the figures behind most backpay claims. Where a dollar rate is not shown, take it from the pay guide for your award.
| Item | What applies | Why it matters for backpay |
|---|---|---|
| National minimum wage | $26.44 per hour from the first full pay period starting on or after 1 July 2026 | The floor for award-free employees |
| Casual minimum | At least $33.05 per hour for award-free casuals, including the 25% loading | A casual paid less than this has a shortfall |
| Award minimum rates | Rose 4.75% from the same date | An old rate after that date is a common cause |
| Payslips | Within 1 working day of payday | Shows what was paid so errors can be spotted |
| Pay records | Kept for 7 years | Evidence of hours and rates in a dispute |
| Super | 12% of ordinary time earnings, reaching the fund within 7 business days of payday | Late or missing super is also recoverable |
Backpay and related terms
- Super guarantee: the percentage of ordinary time earnings an employer must pay into your fund on top of wages.
- Single Touch Payroll: the system that reports wages and super to the ATO each payday.
- Payslip: the record of hours, rates, loadings and deductions you can check against the pay guide.
- Minimum wage: the lowest hourly rate that applies when no award sets a higher one.
Backpay FAQ
How long does an employer have to pay backpay?
An employer should pay as soon as the error is confirmed, and many fix it in the next pay run. Time limits apply to recovering underpayments, so do not wait. Contact the Fair Work Ombudsman if you are unsure how far back a claim can go.
Is backpay taxed?
Backpay is generally treated as income and paid through payroll, with tax withheld like your normal wages. The way tax applies to a large lump sum can depend on the period it covers. Check the ATO or ask a tax adviser about your case.
Can I claim backpay after I leave the job?
Yes. A former employee can still raise unpaid wages, penalty rates or leave entitlements, and unused annual leave must be paid out when employment ends. Gather your payslips, rosters and contract, then write to the employer or contact the Fair Work Ombudsman.
Getting backpay right
This is general information, not legal, tax or financial advice, so check the Fair Work Ombudsman, the ATO or an employment lawyer for your situation. For the wider picture, read our guide to payroll for small business.
If you are between jobs and want work where pay is set out clearly, see our recruitment page and register with us.