Salary Sacrifice to Super: How It Affects Your Pay and Tax

What is salary sacrifice to super?

Salary sacrifice to super is an arrangement where you agree to forgo part of your before-tax salary in exchange for your employer making additional superannuation contributions on your behalf. It is a voluntary strategy that can reduce your taxable income while boosting your retirement savings. Unlike salary sacrifice for a car or other benefits, super contributions are taxed at a concessional rate of 15% within the fund (up to the cap), making it a tax-effective way to save.

How it affects your gross pay and the Salary Index

The Salary Index measures full-time adult ordinary-time earnings, with 100 set at $108,352 per year (based on ABS Average Weekly Earnings, May 2026). This figure is your gross pay before any salary sacrifice. If you earn $120,000 and sacrifice $10,000 to super, your gross ordinary-time earnings remain $120,000 for index purposes. Your index would be 110.8 ($120,000 ÷ $108,352 × 100). The sacrifice does not change that benchmark because the index tracks what you earn, not what you take home.

However, your taxable income drops to $110,000, which affects your tax bill and your take-home pay. The salary sacrifice amount is not included in your assessable income, so you pay less income tax and Medicare levy. The super fund pays 15% tax on the contribution instead.

Tax savings in practice

Consider a resident earning $120,000 in 2026–27. Without salary sacrifice, tax is calculated as:

• $0 on first $18,200
• 15% on $18,201 to $45,000 = $4,020
• 30% on $45,001 to $120,000 = $22,500
• Total income tax: $26,520
• Medicare levy (2%): $2,400
• Total: $28,920

With a $10,000 salary sacrifice to super, taxable income is $110,000:

• 15% on $18,201 to $45,000 = $4,020
• 30% on $45,001 to $110,000 = $19,500
• Total income tax: $23,520
• Medicare levy (2%): $2,200
• Total: $25,720

You save $3,200 in tax and Medicare. The $10,000 contribution to super is taxed at 15% ($1,500), so your net benefit is $3,200 – $1,500 = $1,700 plus the $8,500 that goes into your super account. Over time, compounding returns can make this strategy powerful.

Limits and rules

The concessional contributions cap for 2026–27 is $27,500 per year. This includes your employer's super guarantee (12% of your ordinary-time earnings) plus any salary sacrifice. For example, if your salary is $120,000, your employer pays $14,400 in SG (12% × $120,000). You can salary sacrifice up to $13,100 more to reach the cap. If you exceed the cap, the excess is taxed at your marginal rate plus an additional 15% (or 30% if your income exceeds $250,000 under Division 293).

Also note that the super guarantee is calculated on your ordinary-time earnings. Some awards or enterprise agreements require SG to be based on your full salary before sacrifice, while others allow it to be reduced. Check your pay guides or your award to be sure. If SG is calculated on the reduced salary, your employer's contribution drops, partially offsetting the benefit.

Who benefits most?

Salary sacrifice to super is most valuable if you are in the 30% tax bracket or higher. The 15% tax inside super is lower than your marginal rate, so you save the difference. For lower earners, the benefit is smaller, and you may be better off using after-tax contributions to qualify for the government co-contribution or the low-income super tax offset.

State and industry context

Your salary index varies by states and industries. For example, the national index is 100, but Western Australia sits at 106.9 and Tasmania at 88.6. If you work in mining (index 154.7) or professional services (114.7), your gross pay is well above the national line. Salary sacrifice to super can help you manage the higher tax that comes with those earnings. Conversely, if you work in retail (75.9) or accommodation and food services (72.5), your gross pay is below the national line, and salary sacrifice may be less beneficial because your marginal rate is lower.

Practical considerations

• Salary sacrifice reduces your take-home pay. Ensure you can cover your living expenses.
• It is an ongoing arrangement; you can usually vary or stop it by agreement with your employer.
• The sacrificed amount counts towards your total super balance and may affect your ability to make non-concessional contributions later.
• If you have a HELP debt, salary sacrifice reduces your repayable income, which may lower your compulsory repayment amount.

For more detail on how the index works and how different pay components are measured, see how the index works. You can also explore topics related to super, tax, and salary packaging.

Summary

Salary sacrifice to super is a legitimate way to reduce your taxable income and build retirement savings. It does not change your gross ordinary-time earnings or your Salary Index figure, but it lowers your tax bill and increases your super balance. The key is to stay within the concessional contributions cap and understand how your award treats SG. Use the tax brackets and the index to see where you sit, and consider whether salary sacrifice aligns with your financial goals.