Salary Sacrifice Super: How It Works and Whether It's Worth It

The most underused tax strategy for working Australians

If you earn over $45,000 a year, salary sacrificing into superannuation is almost certainly the highest-returning, lowest-risk financial move available to you. Yet surveys consistently show that fewer than 30% of eligible Australians use it. The reason is usually confusion about how it works — not a reasoned decision not to use it.

Use the Super Contribution Calculator to model the impact of salary sacrifice on your take-home pay and retirement balance. This guide explains the mechanics behind it.

What salary sacrifice actually means

Salary sacrifice is an arrangement between you and your employer where you agree to receive less take-home pay in exchange for additional contributions going into your superannuation fund. The portion you sacrifice is paid from your pre-tax salary — before income tax is calculated.

This matters because contributions going into super as salary sacrifice are taxed at 15% (the concessional contributions tax rate) rather than your marginal income tax rate, which could be 30%, 37%, or 45%. The difference is your tax saving.

The maths: a concrete example

Say you earn $95,000 per year. Your marginal tax rate is 30%. If you salary sacrifice $500 per month ($6,000 per year) into super:

• Without sacrifice: That $6,000 is taxed at 30% = $1,800 in income tax, leaving $4,200 in your pocket
• With sacrifice: That $6,000 goes to super where it's taxed at 15% = $900 in contributions tax, leaving $5,100 in your super fund
• Your gain: $5,100 in super vs $4,200 in your hand — that's $900 per year better off, purely from the tax difference

And that $5,100 sits in super growing with compounding returns, sheltered from further tax on earnings (at a maximum of 15% in the accumulation phase).

Use the Take Home Pay Calculator to see exactly how your net pay changes with a salary sacrifice arrangement.

The concessional contributions cap

Salary sacrifice contributions are classified as concessional contributions — they include your employer's compulsory super guarantee (SG) contributions as well. For 2025-26, the concessional contributions cap is $30,000 per year.

With a $95,000 salary, your employer's SG at 11.5% = $10,925. That leaves $30,000 − $10,925 = $19,075 of remaining concessional cap you can use for salary sacrifice. Exceeding the cap means the excess is taxed at your marginal rate plus a charge, so never go over without checking your position first.

If you've had lower contributions in previous years, the carry-forward rules may allow you to contribute more than the standard $30,000 cap in a single year — useful if you receive a bonus or have a windfall.

How to set up salary sacrifice

The process is simpler than most people expect:

1. Contact your payroll or HR department and ask to set up a salary sacrifice arrangement for superannuation
2. Specify the dollar amount per pay period you want sacrificed
3. Your employer will adjust your payroll so the specified amount goes directly to your nominated super fund as an employer contribution
4. The arrangement is documented in a salary sacrifice agreement — keep a copy

You can start, stop, or change the amount at any time (subject to your employer's payroll processing cycle). There's no ATO form to submit — it's entirely between you and your employer.

Who benefits most from salary sacrifice

The higher your marginal tax rate, the larger the benefit:

• Earning under $37,000: Your marginal rate is 16% or less — barely above the 15% contributions tax, so the benefit is minimal
• Earning $45,001–$135,000: Your marginal rate is 30%. Every dollar sacrificed saves 15 cents in tax. For $10,000 sacrificed, that's $1,500 saved.
• Earning $135,001–$190,000: Marginal rate is 37%. Every dollar saves 22 cents in tax.
• Earning over $190,000: Marginal rate is 45%. Note the Division 293 tax applies, reducing the effective super tax rate to 30% — still a 15-cent saving per dollar.

The long-term compounding effect

The tax saving is just the start. The real power is what those extra contributions do inside super over 20–30 years. An extra $5,000 per year in super at age 35, growing at 7% p.a. for 30 years, adds approximately $472,000 to your retirement balance.

Use the Super Balance Growth Calculator to model your specific scenario. The results are often startling — even small additional contributions made early can dwarf their nominal value by retirement.

For deeper reading on the mechanics of super strategy, Australian superannuation guides on Amazon are a solid starting point — particularly books specifically covering salary sacrifice and concessional contribution strategies.

Common mistakes to avoid

• Exceeding the $30,000 concessional cap without checking your employer SG
• Salary sacrificing when you have high-interest debt (credit cards at 20%+ should almost always be paid first)
• Confusing salary sacrifice with after-tax contributions — they're different mechanisms with different caps
• Forgetting to update your sacrifice amount after a pay rise (you may have more cap headroom than before)