How salary sacrifice into super affects your pay and tax

What is salary sacrifice into super?

Salary sacrifice into super is a common strategy in Australia where you ask your employer to pay part of your pre-tax salary directly into your superannuation fund instead of giving it to you as cash. This reduces your taxable income, which can lower the income tax you pay. The amount sacrificed is taxed at 15% inside super, often lower than your marginal rate. This arrangement is different from the employer's mandatory super guarantee (12% from 1 July 2026) and is entirely voluntary.

How salary sacrifice into super affects your gross pay and the Salary Index

Your gross ordinary-time earnings – the figure used for the Salary Index – does not change when you salary sacrifice into super. The Salary Index measures your gross pay before any salary sacrifice. For example, if you earn the national line of $108,352 (index 100), and you salary sacrifice $10,000, your taxable income drops to $98,352, but your index figure remains 100. This is because the index is based on full-time adult ordinary-time earnings, not your taxable income. So your position on the index stays the same, but your take-home pay is lower.

Tax implications of salary sacrifice into super

Salary sacrifice into super reduces your taxable income, which can move you into a lower tax bracket. For 2026–27, the resident tax rates (excluding Medicare) are: nil up to $18,200; 15% from $18,201 to $45,000; 30% from $45,001 to $135,000; 37% from $135,001 to $190,000; 45% above $190,000. Plus a 2% Medicare levy. If you are in the 30% bracket and sacrifice $10,000, you save $3,000 in tax (30% of $10,000). The $10,000 contributed to super is taxed at 15%, so you effectively paying $1,500 tax inside super. So the net tax benefit is $1,500. This can be significant over time.

Super implications of salary sacrifice into super

Your employer must still pay the 12% super guarantee on your ordinary-time earnings before salary sacrifice. So if you earn $100,000, your employer pays $12,000 into super regardless of your sacrifice. If you then sacrifice an extra $10,000, your total super contributions for the year become $22,000. This can help you build retirement savings faster. However, be aware of the concessional contributions cap of $27,500 per year. If your total contributions (employer guarantee plus salary sacrifice) exceed that, you pay additional tax.

The Salary Index and salary sacrifice: state and industry context

The states and industries have different average earnings, which can affect the benefit of salary sacrifice into super. For example, if you work in Western Australia (index 106.6) or ACT (109.9), your higher gross pay means a higher marginal tax bracket, making salary sacrifice more beneficial. Conversely, in retail trade (index 75.9) or accommodation and food services (index 72.5), lower earnings may mean lower marginal rates, reducing the benefit. The how the index works explains that the index is a benchmark, not a personal quote. Use the pay guides to see typical pay in your industry.

Practical example of salary sacrifice into super

Consider a worker in professional, scientific and technical services (index 114.7, annualised $124,000). If they earn $124,000 and sacrifice $15,000 into super, their taxable income drops to $109,000. Their marginal rate is 30% (since $109,000 is within 30% bracket). They save $4,500 in tax (30% of $15,000) and pay $2,250 tax inside super (15% of $15,000). Net tax saving $2,250. Their employer still pays 12% on $124,000 ($14,880). Total super contributions $29,880, which exceeds the cap of $27,500 by $2,380, incurring excess contributions tax. So careful planning is needed.

Key considerations for salary sacrifice into super

• Check your employer offers salary sacrifice. Not all employers offer it.
• Consider your cash flow needs: reducing take-home pay may be difficult if you need money now.
• Salary sacrifice may affect your eligibility for government benefits like Family Tax Benefit or the Medicare levy surcharge.
• You cannot access salary sacrifice contributions until you meet a condition of release (usually retirement after age 60).
• The concessional contributions cap is $27,500 per year; if you exceed it, the excess is added to your taxable income and taxed at your marginal rate.

Conclusion

Salary sacrifice into super is a powerful tool to reduce tax and boost retirement savings, but it does not change your Salary Index figure. Use the topics to explore more about pay and super. Always consider your personal situation and seek professional advice.