For Australian professionals earning $150,000 or more, salary sacrifice into superannuation is one of the most effective tax strategies available. By redirecting part of your pre-tax salary into super, you can save thousands in tax each year — and those savings compound over decades to dramatically shorten your path to financial independence.

But salary sacrifice isn't as straightforward as it sounds. Concessional contribution caps, Division 293 tax for high earners, and the super preservation age all add complexity. Here's how it all fits together — and how to work out whether salary sacrifice makes sense for your FIRE plan.

What is salary sacrifice?

Salary sacrifice — sometimes called salary packaging — is an arrangement with your employer where you redirect part of your pre-tax salary directly into your superannuation fund. Instead of receiving that money as take-home pay (taxed at your marginal rate), it goes into super where contributions are taxed at just 15%.

The tax saving comes from the gap between your marginal tax rate and the 15% super contributions tax. The higher your income, the bigger the gap.

For someone on a $200,000 salary, the marginal tax rate is 45% plus 2% Medicare levy — a total of 47%. Every dollar salary sacrificed into super is taxed at 15% instead of 47%. That's a 32% saving on each dollar.

The concessional contributions cap

There's a limit to how much you can contribute to super at the concessional (15%) tax rate. For FY2025-26, the annual concessional contributions cap is $30,000. This cap covers all concessional contributions combined — including your employer's Superannuation Guarantee (SG) contributions and any salary sacrifice.

Your employer already contributes 12% of your ordinary time earnings as SG. This eats into your $30,000 cap before you even start sacrificing.

Here's what the available room for salary sacrifice looks like at different incomes:

As your salary increases, employer SG takes up more of the cap, leaving less room for salary sacrifice. At $250,000 and above, employer SG alone fills the entire concessional cap — meaning there's no room for salary sacrifice at all.

Any concessional contributions above the $30,000 cap are added back to your assessable income and taxed at your marginal rate, plus an interest charge. Exceeding the cap is something you want to avoid.

How much can you actually save?

Let's work through two concrete examples.

Example 1: $150,000 salary

• Marginal tax rate: 37% (plus 2% Medicare levy = 39%)
• Employer SG: $18,000
• Room to sacrifice: $12,000

Without salary sacrifice, that $12,000 would be taxed at 39% — you'd lose $4,680 to tax and keep $7,320 in your pocket.

With salary sacrifice, the $12,000 goes to super and is taxed at 15% — $1,800 in contributions tax, leaving $10,200 in your super account.

Annual tax saving: $2,880. Your take-home pay drops by $7,320, but your super grows by $10,200 — a net benefit of $2,880 every year.

Example 2: $200,000 salary

• Marginal tax rate: 45% (plus 2% Medicare levy = 47%)
• Employer SG: $24,000
• Room to sacrifice: $6,000

Without sacrifice: $6,000 taxed at 47% = $2,820 tax, $3,180 take-home.

With sacrifice: $6,000 taxed at 15% in super = $900 tax, $5,100 in super.

Annual tax saving: $1,920. Less room to sacrifice at this income, but the percentage saving per dollar is higher because of the wider gap between marginal rate and super rate.

The compounding effect

The real power isn't just the annual saving — it's what happens when those extra super contributions compound over time.

If the $150,000 earner salary sacrifices $12,000 every year, the tax saving puts $2,880 more to work each year compared to investing after income tax. After 15% contributions tax, $10,200 enters the super account annually — versus $7,320 available to invest outside super after income tax at 39%. That's nearly $3,000 more going to work for you each year, and over 15 years of compounding — combined with super's lower tax on investment earnings — the difference adds up to a six-figure advantage from the same gross income, purely through tax efficiency.

Division 293: the high-income super tax

If your income plus concessional super contributions exceeds $250,000, you'll pay an additional 15% tax on some or all of your concessional contributions. This is called Division 293 tax, and it effectively increases the super contributions tax from 15% to 30% on the affected amount.

For a $230,000 earner maximising concessional contributions to $30,000:

• Employer SG (12%): $27,600
• Salary sacrifice: $2,400
• Income + contributions = $260,000
• Amount over $250,000 threshold = $10,000
• Division 293 tax = 15% on $10,000 = $1,500

Even with Division 293, salary sacrifice remains worthwhile in this range. On the affected contributions, the effective super tax is 30% — still well below the 47% marginal rate (45% + Medicare). For earners at $250,000 and above, where employer SG alone fills the $30,000 cap, there's no room for voluntary salary sacrifice — but the employer contributions still benefit from being taxed at a lower rate inside super.

Catch-up contributions: using unused caps

If you haven't been maximising your concessional contributions in previous years, you may be able to catch up. Since 1 July 2018, unused concessional cap amounts carry forward for up to five financial years, provided your total super balance was below $500,000 at the previous 30 June.

This is particularly useful if you've recently had a pay increase, received a bonus, or simply weren't aware of salary sacrifice earlier in your career. You could potentially contribute well above $30,000 in a single year using your accumulated unused cap.

For example, if you've only used $20,000 of your $30,000 cap in each of the past three years, you'd have $30,000 in unused cap space. Combined with this year's $30,000 cap, you could contribute up to $60,000 in concessional contributions.

The FIRE trade-off: super is locked until preservation age

Here's the critical consideration for anyone pursuing FIRE: money in super is locked until you reach your preservation age, which is 60 for most people.

If you plan to retire at 45, salary sacrifice builds wealth you can't touch for 15 years. You'll need enough in accessible investments — shares, ETFs, cash, property — to cover your living expenses during this "bridge period" between retirement and super access.

This creates a genuine tension in FIRE planning:

• Salary sacrifice is the most tax-efficient way to build wealth, but it's inaccessible early
• Investing outside super gives you flexibility but costs more in tax
• The optimal strategy usually involves doing both — sacrificing into super up to the cap while also building accessible investments

The right balance depends on your target retirement age, your current super balance, and how much you need in accessible assets to bridge the gap.

How Wealth Dashboard helps you optimise salary sacrifice

This is exactly the kind of multi-variable problem that Wealth Dashboard is designed to solve. When you enter your financial details, the platform:

• Models salary sacrifice impact — See how different sacrifice amounts affect your FIRE timeline, accounting for the concessional cap and Division 293
• Tracks the bridge period — Separates your accessible investments from super, showing whether you have enough liquid assets to cover expenses until preservation age
• Calculates Australian tax accurately — Applies FY2025-26 tax brackets, Medicare levy, and super contribution rules to give you precise after-tax projections
• Runs what-if scenarios — Compare strategies side by side: what happens if you maximise salary sacrifice versus investing more outside super? The simulation engine shows you the trade-offs in concrete numbers

You can also use the free FIRE calculator to see how superannuation contributions affect your projected FIRE age — no signup required.

When salary sacrifice makes the most sense

Salary sacrifice is most powerful when:

• Your marginal tax rate is high — The bigger the gap between your marginal rate and 15%, the more you save
• You're not planning to retire very early — If your target retirement age is 50+, the money won't be locked for long
• You haven't hit the concessional cap — There's no benefit if your employer SG already fills the $30,000 cap
• Your super balance is below $500,000 — You may be eligible for catch-up contributions using unused caps from prior years
• You have enough accessible investments — You're not starving your bridge period to feed your super

For most high-income professionals in their 30s and 40s, the answer is typically to maximise salary sacrifice up to the cap while simultaneously building investments outside super. Wealth Dashboard's projection engine can show you exactly how this balance plays out over your specific timeline.

Getting started

If you're not currently salary sacrificing, speak to your employer or payroll team about setting it up. Most employers support salary sacrifice arrangements, and the process is usually straightforward.

Before you decide how much to sacrifice, map out your complete financial picture. Your salary sacrifice strategy should fit within your broader FIRE plan — not be made in isolation. See our guide to superannuation and early retirement for a deeper look at how super fits into the FIRE equation, or read about Australian tax strategies for FIRE for more ways to optimise your tax position.

Ready to see how salary sacrifice affects your FIRE timeline? Try the free calculator or create a Wealth Dashboard account to model detailed scenarios with your actual numbers.