Disadvantages of Salary Sacrifice: How State and Industry Differences Affect Your Pay Index

Understanding the Disadvantages of Salary Sacrifice and the National Pay Index

Salary sacrifice is an arrangement where you forgo part of your salary in exchange for a benefit like a car or super contributions. While it can lower your taxable income, it also reduces your ordinary-time earnings, which is the basis for the Salary Index that compares your pay against the national line of 100. The national line uses full-time adult ordinary-time earnings of $108,352 per year (index 100). When you sacrifice salary, your reported gross drops, so your index may fall below what it would be without sacrifice. This matters when comparing across states and industries because the baseline varies.

How Salary Sacrifice Lowers Your Index Figure

Your index is your yearly gross divided by the national line times 100. If you earn $120,000 but sacrifice $20,000 for a car, your reported ordinary-time earnings become $100,000, giving an index of 92.3, well below the national average. The disadvantage is that you appear to be earning less relative to others, even though your total remuneration may be higher. This can affect your standing in pay comparisons, especially in high-index states like Western Australia (106.9) or industries like mining (154.7). For example, a miner in WA on a high base might sacrifice salary for a vehicle, dropping their index from 154 to maybe 130, still above the national line but lower than peers who don't sacrifice.

Tax Disadvantages of Salary Sacrifice

Salary sacrifice reduces taxable income, which can push you into a lower marginal tax bracket. However, the disadvantage is that you lose access to that income for immediate needs. The 2026–27 tax rates apply: 30% between $45,001 and $135,000, 37% to $190,000. If you sacrifice too much, you might miss out on the tax-free threshold benefits or reduce your eligibility for certain offsets. Additionally, the Medicare levy (2%) applies to your reduced income, but you still pay it. The sacrifice does not reduce the levy surcharge if applicable. For a resident earning $130,000, sacrificing $20,000 drops taxable income to $110,000, saving about $6,000 in tax, but you lose $20,000 in cash. That is a real disadvantage if you need liquidity.

Super Guarantee and Award Implications

From July 2026, the super guarantee is 12% on ordinary-time earnings up to $270,830. Salary sacrifice reduces the base for super contributions, meaning your employer pays less super. Even if you sacrifice into super, the total super may be similar, but the compulsory employer contribution is lower. This is a disadvantage because you lose the benefit of employer contributions on the sacrificed amount. Also, many modern awards use ordinary-time earnings for penalty rates, overtime, and allowances. If you sacrifice salary, your penalty rates may be calculated on a lower base, lowering your overtime pay. For example, a retail worker (retail trade index 75.9) on a base of $80,000 sacrificing $10,000 reduces penalty calculations, reducing take-home even more.

State and Industry Differences Exacerbate Disadvantages

State indexes vary widely: ACT 109.9, WA 106.9, NSW 101.2, VIC 98, QLD 97.9, SA 94.6, NT 95.2, TAS 88.6. If you sacrifice salary in a high-index state like WA, your index drops more dramatically relative to the national line. In a low-index state like TAS, sacrificing may push you even further below the national average. Industry also matters: professional services (index 114.7) vs accommodation (72.5.5). A professional in ACT sacrificing for a car could drop from 114.7 to 100, while a hospitality worker in TAS sacrificing might fall from 72.5 to 60, a bigger relative disadvantage. The pay guides on our site explain how awards interact with sacrifice.

Other Disadvantages: FBT and Reporting

Salary sacrifice can trigger fringe benefits tax (FBT) for certain items like cars, which employers may pass on. This reduces the net benefit. Also, the Australian Taxation Office (ATO) has rules about reportable fringe benefits that can affect your tax return and HELP repayments. These are disadvantages not always obvious. The how the index works page explains that the index uses ordinary-time earnings, not total remuneration, so sacrifice always lowers your index.

Conclusion: Weighing the Disadvantages

Before entering a salary sacrifice arrangement, consider how it affects your index, your take-home pay, your super, and your award entitlements. The disadvantages are especially pronounced in high-index states and industries where your base is already above average, as sacrifice can bring you closer to the national line or below. In low-index industries, sacrifice can make you fall further behind. Always check your award and consult a tax professional. For more on state and industry pay differences, see our topics page.