Superannuation Salary Sacrifice Calculator: How It Affects Your Pay on the Australian Salary Index

What is a superannuation salary sacrifice calculator?

A superannuation salary sacrifice calculator is a tool that shows how redirecting some of your pre-tax pay into your super fund changes your take-home pay and your overall financial position. It uses your gross annual salary, the amount you want to sacrifice, and the current tax rates to estimate your net income after tax and super contributions. Because the calculator works with your gross earnings, it can also show where your pay sits on the Australian salary index — a benchmark where 100 equals the national full-time adult ordinary-time earnings of $108,352 per year (ABS Average Weekly Earnings, May 2026).

How salary sacrifice works with the salary index

The salary index measures your gross ordinary-time earnings against the national line. Salary sacrifice does not change your gross earnings — the amount your employer pays you before tax remains the same. For example, if you earn $90,000 a year and sacrifice $15,000 into super, your gross is still $90,000. Your salary index is therefore 90,000 ÷ 108,352 × 100 = 83.0. That index number stays the same whether you sacrifice or not.

What changes is your taxable income. After sacrificing $15,000, your taxable income drops to $75,000. Using the 2026–27 resident tax rates (excluding Medicare), you pay:

• $0 on the first $18,200
• 15% on the next $26,800 ($4,020)
• 30% on the remaining $30,000 ($9,000) Total tax = $13,020. Without sacrifice, on $90,000, tax would be $4,020 + 30% on $45,000 ($13,500) = $17,520. You save $4,500 in tax. Plus the 2% Medicare levy applies to both scenarios.

Using the calculator to compare state and industry benchmarks

The salary index varies by state and industry. For instance, the ACT has an index of 109.9 (annualised $119,090), while Tasmania sits at 88.6 ($96,008). If you work in mining (index 154.7) versus retail trade (index 75.9), the same gross pay places you very differently on the national scale. A superannuation salary sacrifice calculator can help you see how your gross pay compares to these benchmarks, even though the sacrifice itself doesn't change your index.

To see how your pay stacks up in your state, visit our states page. For industry comparisons, check industries.

The role of awards and the national minimum wage

Your pay may be governed by a modern award or the national minimum wage. From 1 July 2026, the national minimum wage is $26.44 per hour, $1,004.90 per week, annualised $52,255 (index 48.2). Award minima rose by 4.75% from that date. Salary sacrifice is voluntary and cannot reduce your award or minimum wage entitlements. Your gross ordinary-time earnings must still meet the award rate. The calculator assumes your gross pay is at least the minimum required.

For more on how awards interact with pay, see our pay guides.

Super guarantee and salary sacrifice

From 1 July 2026, the super guarantee is 12% of your ordinary-time earnings, up to a maximum contribution base of $270,830. Salary sacrifice contributions count towards this 12% obligation. That means if you sacrifice $10,000, your employer may reduce their own super contribution so that the total (employer SG plus your sacrifice) equals 12% of your gross. The calculator can show you the combined super contribution and how it affects your net pay.

Example: full-time worker on $80,000

Consider a full-time worker in New South Wales (state index 101.2, annualised $109,658). Gross pay $80,000 gives an index of 73.8. If they sacrifice $10,000 into super:

• Gross: $80,000 (index unchanged)
• Taxable income: $70,000
• Tax (2026–27 rates): $0 on $18,200, 15% on $26,800 ($4,020), 30% on $25,000 ($7,500) = $11,520
• Medicare levy (2% of $70,000): $1,400
• Total tax and levy: $12,920
• Take-home pay: $70,000 – $12,920 = $57,080
• Super contribution: employer SG 12% of $80,000 = $9,600, plus sacrifice $10,000 = $19,600 total into super (but note the employer may only pay $9,600 if sacrifice counts toward SG).

Without sacrifice, take-home would be $80,000 – tax ($17,520) – Medicare ($1,600) = $60,880. The sacrifice reduces take-home by $3,800 but adds $10,000 to super (net benefit $6,200 before investment returns).

Understanding the index after sacrifice

Because the index uses gross earnings, your index remains 73.8. But your effective financial position changes. The calculator helps you weigh the trade-off between current income and retirement savings. For a deeper explanation of how the index is built, see how the index works.

Tax considerations and limits

Salary sacrifice contributions are subject to the concessional contributions cap ($27,500 for 2026–27). Exceeding the cap incurs additional tax. The calculator typically warns if you exceed the cap. Also, the Medicare levy surcharge may apply if you don't have appropriate private hospital cover, but the calculator ignores that for simplicity.

Using the calculator for part-time or casual workers

Part-time and casual workers can also use the calculator. Enter your annualised gross pay (based on your ordinary hours). Casual workers receive a loading (e.g., 25% on top of the minimum wage, which from 1 July 2026 is $33.05 per hour). The calculator treats the gross as your total ordinary-time earnings including loading. Your index is then based on that gross.

Final thoughts

The superannuation salary sacrifice calculator is a practical tool for seeing how pre-tax super contributions affect your net pay and your position on the Australian salary index. While the index itself doesn't change, your take-home income and super balance do. Use it alongside our Salary Index to understand where you stand nationally.