Salary Sacrifice Super vs Extra Mortgage Repayments: Which Wins in 2026?

If you earn $110,000 and salary sacrifice $13,000 into super instead of making extra mortgage repayments, you keep $2,210 more that would have otherwise gone to the ATO. That immediate tax saving is the core reason this question gets debated so heatedly — but it is not the whole story.

The right answer depends on your income, your mortgage rate, your access to the money, and your stage of life. This guide gives you the maths at each income level, a clear decision framework, and a worked example to run the comparison yourself.

The tax maths: what salary sacrifice actually saves

Salary sacrifice redirects pre-tax income into super, where it is taxed at 15% instead of your marginal rate. The saving depends on your income bracket.

Under the 2026-27 income tax rates, here is what each $10,000 salary sacrificed saves in tax — and how that compares to the after-tax cash you would have kept:

Taxable income (2026-27)	Marginal rate	+ Medicare	Total rate	Super tax	Tax saving per $10k	Return on after-tax equiv.
$18,201 – $45,000	15%	2%	17%	15%	$200	2.4%
$45,001 – $135,000	30%	2%	32%	15%	$1,700	25.0%
$135,001 – $190,000	37%	2%	39%	15%	$2,400	39.3%
$190,001 – $250,000	45%	2%	47%	15%	$3,200	60.4%
$250,001+	45%	2%	47%	30%*	$1,700	32.1%

*Division 293 applies above $250,000, increasing the super tax rate to 30%.

The "return on after-tax equivalent" column is the one that matters. It answers: for every $1 of take-home pay you could have kept, how much more do you end up with by putting the pre-tax equivalent into super instead?

At the $45k–$135k bracket (most Australian workers), the answer is 25% — an immediate, guaranteed uplift before your super fund earns a cent of investment return.

At $190k–$250k (the bracket most affected by the Stage 3 restructure), the figure is 60%. That is not a typo.

For income below $45,000, the benefit is negligible (2.4%) because your marginal tax rate is already the same as the super tax rate. In this case, extra mortgage repayments almost certainly win.

Use our Superannuation Calculator to model how additional contributions compound over your working life.

What your mortgage needs to earn to beat super

The guaranteed after-tax "return" from extra mortgage repayments equals your mortgage interest rate. If your rate is 6.0%, you get a risk-free 6.0% annual return on every extra dollar you put in — because you avoid paying that 6.0% interest.

For salary sacrifice into super to win on pure maths, the super fund's after-tax returns need to exceed that 6.0% after accounting for the tax saving on entry. The tax saving is already captured in the "return on after-tax equivalent" above — but super fund returns are not guaranteed, and returns inside super are also taxed at 15% on earnings (not tax-free until you enter pension phase).

Here is the rough break-even:

Mortgage rate	Required super return to match (at 30–32% MTR)
5.5%	~4.4% after-tax in super
6.0%	~4.8% after-tax in super
6.5%	~5.2% after-tax in super

Balanced super funds (60–70% growth assets) have averaged 8–10% per year over the past decade. After 15% earnings tax inside super, that is roughly 6.8–8.5% net. On that basis, super has historically beaten a 6.0% mortgage — but not by as much as the headlines suggest once you factor in fees and variance.

The key word is historically. Past returns do not guarantee future ones, and any year your super fund goes backwards, you are still paying interest on your mortgage.

The problem most calculators ignore: super is locked until 60

Everything above assumes you are comfortable not touching that money until you reach preservation age — currently 60 for anyone born after 30 June 1964.

If you are 35 today, that is 25 years away. A lot can happen:

• Job loss or a period of reduced income
• Medical emergency or disability (income protection pays while you are off, but a mortgage still exists)
• Relationship breakdown
• A business opportunity requiring capital

Extra mortgage repayments — or money in an offset account — stay accessible. Super does not.

This is not an argument to ignore super. It is an argument to build a buffer first, before redirecting surplus cash to either super or mortgage.

The offset account: the middle path most people miss

An offset account reduces the principal your mortgage interest is calculated on, dollar for dollar. A $50,000 offset against a $550,000 loan means you pay interest on $500,000 — a guaranteed, risk-free return equal to your mortgage rate, with the money remaining accessible at any time.

For most Australians in their 30s, the practical approach is:

1. Build your offset first — three to six months of living expenses (see our emergency fund guide). This is not a return-maximising move; it is risk management.
2. Then salary sacrifice to fill your concessional cap — if your income is above $45,000, the tax saving on super contributions is almost certainly higher than the guaranteed return from your mortgage.
3. Put the remainder into offset — everything above your super cap goes into offset, earning your mortgage rate risk-free.

This approach does not require choosing. It sequences: safety net first, tax benefit second, guaranteed return third.

Worked example: $500 per fortnight over 25 years

Scenario: Sarah is 38, earns $110,000, has a $550,000 mortgage at 6.0%, and wants to do something useful with $500 per fortnight of surplus cash.

Her employer contributes 12% SGC = $13,200/year toward the $32,500 concessional cap. She has $19,300/year of concessional cap remaining — well above the $13,000/year she wants to contribute ($500/fn × 26 = $13,000).

Option A — Extra mortgage repayments ($500/fn)

Sarah pays $13,000 of after-tax income per year directly off the mortgage.

• Guaranteed return: 6.0% per year (interest avoided)
• Over 25 years at 6%: approximately $715,000 in interest saved and equity built (on a $550k loan, paying it down faster reduces total interest dramatically)
• Money is accessible via redraw (subject to lender conditions)

Option B — Salary sacrifice $500/fn into super (pre-tax)

Sarah salary sacrifices $13,000 gross per year.

• Tax saving: $13,000 × 17% (32% MTR minus 15% super tax) = $2,210/year less tax
• Net into super after 15% contributions tax: $13,000 × 0.85 = $11,050/year
• After-tax equivalent Sarah would have kept otherwise: $13,000 × 0.68 = $8,840

So for the same $13,000 of gross income, super receives $11,050 while the after-tax cash for mortgage repayments would have been only $8,840. That is 25% more capital working in super from day one.

At 8% average annual return after earnings tax:

$11,050/year for 25 years at 8% = approximately $810,000 in super

Compare that to the mortgage savings of approximately $715,000 with Option A — and super is ahead on paper by roughly $95,000. But that $810,000 is locked until Sarah turns 63 and depends on 8% annual returns being achieved. The mortgage option builds equity she can access by selling or refinancing.

Use the Mortgage Repayment Calculator to see exactly how much interest you save with extra repayments at your current rate.

Decision framework: what to actually do in your 30s

Work through these questions in order:

1. Do you have three to six months of expenses in an offset or savings account? If no, that comes first. No investment or super contribution replaces an emergency fund.

2. Is your income above $45,000? If yes, salary sacrifice is worth serious consideration — the tax saving is material. If no, the tax benefit is minimal and extra mortgage repayments likely win.

3. Can you access your mortgage rate below 5.5%? If you are on a very low fixed rate, the guaranteed return from extra repayments is lower, making super more attractive by comparison.

4. How many years until you retire? The longer your horizon, the more time super's compound returns have to work. The tax saving on entry, compounded over 20–30 years, is powerful. If you are 10 years from retirement and already mortgage-free, maxing super is usually correct.

5. Could you need the money before 60? If yes — career change, potential redundancy, wanting to work part-time in your 50s — prioritise the offset over additional super contributions. Liquidity has real value.

A practical split for many 30-somethings: Contribute enough to super via salary sacrifice to reduce your marginal tax bill meaningfully (say $5,000–$10,000/year in extra contributions above SGC), while directing the rest into your offset. This captures most of the tax benefit while keeping flexibility.

For the salary sacrifice detail and how to set it up with your employer, see our dedicated guide. For the full picture on super contribution caps, carry-forward rules, and non-concessional contributions, see the caps guide.

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Frequently asked questions

Is it better to salary sacrifice or pay off my mortgage?

For most Australians earning above $45,000, salary sacrifice into super wins mathematically because of the immediate tax saving on contributions — your super fund receives 25% more capital than you would have had after tax. However, super is locked until you turn 60 (preservation age), so it is not a complete substitute for paying down accessible debt. The practical answer for most people in their 30s is to do both: maintain an offset account buffer and salary sacrifice enough to capture the bulk of the tax saving.

What is the breakeven mortgage rate where super stops winning?

Super's edge shrinks as your mortgage rate falls. If your mortgage rate equals or exceeds your expected super fund return (net of 15% earnings tax and fees), the comparison is much closer. At 6.0% mortgage rates and an 8% net super return, super still wins on paper — but the margin is not as large as the entry tax saving alone suggests.

Does salary sacrifice reduce my mortgage repayment capacity?

Yes. Salary sacrifice reduces your take-home pay, which can affect your ability to make extra repayments on the mortgage. If you are already on minimum repayments and cash-tight, fixing that first makes sense before increasing super. Run both paths through our Mortgage Repayment Calculator and Superannuation Calculator to see the actual impact on your numbers.

What is the 2026-27 concessional super cap?

The concessional (pre-tax) contributions cap is $32,500 per year from 1 July 2026, up from $30,000 in 2025-26. This cap includes your employer's Superannuation Guarantee contributions (12% of salary from 1 July 2025) as well as any salary sacrifice or personal deductible contributions you make. Exceeding the cap means the excess is taxed at your marginal rate with a 15% offset.

Can I salary sacrifice into super and still make extra mortgage repayments?

Yes — many people do both. A common approach is to set salary sacrifice at a modest level (say, $5,000–$15,000/year) to capture the tax benefit, then direct remaining surplus cash into an offset account. The offset account earns your mortgage interest rate risk-free while keeping the funds accessible. This beats trying to choose one or the other.

What happens if the government changes super rules before I retire?

Super rules have changed many times — access ages, contribution caps, tax treatment, and pension phase taxation have all shifted over decades. This is a legitimate risk for long-term super planning. It does not mean super is a bad choice, but it does mean diversifying your wealth outside of super (in an offset, ETFs, or investment property) makes sense. Do not keep all your retirement wealth in one vehicle.

Does salary sacrifice affect my Home Loan borrowing power?

It can. Lenders assess your income based on gross salary, but some lenders factor in take-home pay when calculating serviceability. Salary sacrifice reduces your taxable income, which may reduce the amount some lenders will lend you. If you are planning to refinance or buy property soon, check with your lender or broker before significantly increasing your salary sacrifice level.

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This article is for general information only and does not constitute financial, tax or legal advice. Individual circumstances vary. Consult a registered tax agent or licensed financial adviser before making decisions based on this information.