Max Salary Sacrifice Super: How Awards and the National Minimum Wage Set Your Limit

What is max salary sacrifice super?

Max salary sacrifice super refers to the largest amount of your before-tax pay you can choose to put into your superannuation fund instead of receiving it as cash. This strategy reduces your taxable income, and the contributions are taxed at 15% inside the fund, which is often lower than your marginal tax rate. But there are limits. The two main constraints are the need to keep your cash pay above the legal minimum and the annual concessional contributions cap set by the ATO.

This article explains how the Salary Index benchmarks such arrangements and how Australia’s award system and national minimum wage set the floor for your cash pay. Understanding these rules helps you work out your own max salary sacrifice super amount.

How awards set the floor

Modern awards set minimum hourly rates, penalty rates, allowances, and other conditions for specific industries and occupations. These rates are almost always higher than the national minimum wage. For example, the retail trade industry index is 75.9, meaning average full-time ordinary earnings in retail are about 76% of the national line. But an individual retail employee’s award rate might be $27 or $28 per hour, well above the national minimum of $26.44.

When you salary sacrifice super, your employer must still pay you at least the award rate in cash. You cannot sacrifice so much that your take-home cash drops below the minimum set by your award or, if no award applies, the national minimum wage. That means your max salary sacrifice super is the difference between your gross ordinary pay and the applicable minimum cash wage.

For instance, if your award rate is $30 per hour and you work 38 hours a week, your weekly gross is $1140. The national minimum wage is $1004.90 per week. You could theoretically sacrifice up to $135.10 per week into super, provided that amount plus the employer’s super guarantee does not exceed the concessional cap. But if your award has a higher minimum cash wage, that becomes your floor instead.

National minimum wage and salary sacrifice

The national minimum wage from 1 July 2026 is $26.44 per hour, $1004.90 per week, annualised at $52,255. On the Salary Index, that’s 48.2 – less than half the national line of 100 ($108,352). If you earn exactly the national minimum wage, you cannot salary sacrifice any super because your cash pay is already at the legal minimum. Any sacrifice would push you below the floor.

However, many employees earn above the minimum. The pay guides from Fair Work Ombudsman list the exact rates for each award. If you are on a classification that pays, say, $28 per hour, your weekly gross is $1064. You could sacrifice up to $59.10 per week before hitting the national minimum. But remember: your award might specify a higher minimum cash wage than the national minimum. Always check your specific award.

Calculating your max sacrifice

To find your own max salary sacrifice super, follow these steps:

1. Know your ordinary hourly rate under your award or agreement. This is the rate before any overtime or penalties.
2. Multiply by your ordinary hours (usually 38 per week for full-time) to get your weekly gross ordinary pay.
3. Find the minimum cash wage that applies to you. This is either the national minimum wage ($1004.90/week) or a higher award minimum.
4. Subtract the minimum cash wage from your gross pay. The result is the maximum weekly amount you could salary sacrifice without breaking the cash floor.
5. Check the concessional cap. The ATO sets an annual limit on concessional contributions (employer guarantee plus salary sacrifice). For 2026–27, the cap is not given here, but it is typically around $27,500. If your weekly sacrifice multiplied by 52 exceeds the cap, you must reduce it.

For example, a professional in the scientific and technical industry (index 114.7) might earn $120,000 annually. Their weekly gross is about $2308. The national minimum wage floor is $1004.90, so the theoretical max sacrifice is $1303 per week. But the concessional cap would limit total annual contributions to about $27,500, meaning a weekly sacrifice of around $529 (plus employer 12% on $2308 = $277, total $806 – still under cap). So the cap is the binding constraint for higher earners.

Index perspective

The how the index works page explains that the Salary Index compares your gross ordinary-time earnings to the national line of 100. For salary sacrifice, the index of your cash pay after sacrifice would drop, but your super balance grows. The national minimum wage index is 48.2, while award rates vary. For instance, the health care and social assistance industry index is 97.8, close to the national line. An employee in that industry earning the industry average could sacrifice a meaningful amount while staying above the minimum.

State differences also matter. In Western Australia (index 106.9), average earnings are higher, so there is more room for salary sacrifice. In Tasmania (index 88.6), the average is lower, so the floor is relatively closer. But remember: these are averages, not individual rates. Your personal award classification is what counts.

Important caveats

Salary sacrifice super is a voluntary arrangement. It does not change your award classification or your entitlement to penalty rates, allowances, or leave. Those are calculated on your ordinary pay before sacrifice, unless your award or enterprise agreement says otherwise. Also, salary sacrifice contributions are subject to the same tax rules as employer contributions – they count towards your concessional cap. Exceeding the cap results in additional tax.

Finally, the figures in this article are based on the industries and state benchmarks from the Salary Index reference. They are not a quote for any specific job or person. Always consult your employer, a tax professional, or the ATO for your individual situation.

Summary

Max salary sacrifice super is the amount you can put into super from your before-tax pay without dropping below the legal cash minimum. That minimum is either the national minimum wage or a higher award rate. The concessional cap also applies. Use your award rate and ordinary hours to calculate your personal limit, and check the cap each year. The Salary Index helps you see where your pay sits relative to the national line, but your award is the real floor.