Your Employer Is Underpaying You: How to Demand Back-Pay

You’ve checked your award rate or enterprise agreement. You’ve checked your payslips. The maths doesn’t add up. You’ve been underpaid — for weeks, months, possibly years. Your employer has done nothing about it, fobbed you off, or said it’ll “come out in the next pay cycle”.

Wage underpayment is one of the most common — and recoverable — workplace claims in Australia. The Fair Work Ombudsman recovered over $500 million in underpaid wages in a recent reporting period. The legal path is clear, but you need to follow it in the right order.

Step 1: Calculate exactly what you’re owed

Before any letter goes out, get the numbers right:

• Identify the modern award or enterprise agreement that covers your role
• Calculate the correct base rate, plus any allowances, penalties, overtime, and leave loading you should have received
• Compare against what you were actually paid (use payslips, payroll records, bank deposits)
• Calculate the shortfall, with separate columns for wages, superannuation, and any unpaid entitlements (annual leave, personal leave loading, sick leave)

The Fair Work Ombudsman’s pay calculator at fairwork.gov.au is free and authoritative.

Step 2: Send a formal Letter of Demand

Most employers fix underpayment claims when a formal letter arrives — often because they’ve already been on the regulator’s radar and don’t want a Fair Work investigation triggered. The letter:

• References your employment (start date, role, award/EA)
• Sets out the exact shortfall by pay period with calculations
• Cites the relevant award clauses or NES (National Employment Standards) entitlements
• Demands payment within a specific deadline (typically 14 days)
• States the next step: a complaint to the Fair Work Ombudsman + a Fair Work Commission claim if appropriate

What about Fair Work?

The Fair Work Ombudsman is the regulator. They investigate underpayments and can issue compliance notices forcing employers to pay. Their service is free. A direct Letter of Demand puts your claim to the employer in writing straight away. If it does not resolve it, the formal Fair Work complaint becomes much stronger because you have a documented refusal on file.

Statute of limitations

Most underpayment claims must be brought within 6 years of the underpayment occurring. If you’re sitting on a multi-year underpayment, the older portion may be outside the window. Act sooner rather than later.

What about employer retaliation?

Adverse action against an employee for asserting workplace rights (including raising an underpayment claim) is illegal under the Fair Work Act. If you experience retaliation — sudden negative reviews, hours cut, sham termination — that’s a separate general protections claim with very strong remedies.

Flat fee

The wizard asks for your employment details, the calculated shortfall, and the period covered. Our Programmatic Algorithms draft a Fair-Work-grounded letter and send it to your employer. The letter goes to whoever you nominate — direct manager, HR, or company secretary.