Salary Sacrificing Into Super Before EOFY 2026: The 8-Week Playbook to Cut Your Tax Bill

Quick take: Between now and 30 June 2026 you have one of the cleanest tax-saving windows the Australian system offers — and most workers either don't use it at all or leave thousands on the table by acting too late. Salary sacrificing into super lets you swap a slice of your top-marginal-rate income for the 15% concessional super tax. On a $90,000 salary, that's a 17 cent saving in the dollar; on $150,000, it's 22.5 cents in the dollar. Done correctly, an extra $10,000 sacrificed before EOFY can put $2,250 back in your pocket — without changing your job, your insurance, or your investments.

What "Salary Sacrifice" Actually Means on a Payslip

Salary sacrifice is a written agreement between you and your employer to redirect part of your pre-tax wage into your super fund instead of paying it to you as cash. The cash you give up never appears as taxable income on your payslip. Your taxable income goes down, the contribution lands in your super fund, and your fund pays 15% contributions tax on the way in. Because most workers sit on a marginal rate well above 15% — 32%, 39%, or 47% once Medicare is included — the gap between your marginal rate and the 15% super rate is the tax saving.

Three things must be true for it to be a valid salary sacrifice and not just a personal contribution from after-tax money:

1. The agreement must be in place before the income is earned. You cannot sacrifice money that has already hit your bank account or been processed through a finalised payslip. The ATO is very clear on this — retrospective sacrifices don't work.

2. The employer has to actually pay the sacrificed amount into super, on top of (not instead of) the 12% Super Guarantee. Some unscrupulous employers historically tried to count salary sacrifice towards their SG obligation. That loophole was permanently closed on 1 January 2020 — your SG must be calculated on your full pre-sacrifice salary.

3. The arrangement should be documented in writing. Most large employers have a HR portal where you fill in a form; smaller employers might just need an email exchange. Either way, keep the paper trail.

The Tax Math: How Much Do You Actually Save?

The marginal tax rates that apply to your sacrifice in 2025-26 are: nil up to $18,200, 16% from $18,201 to $45,000, 30% from $45,001 to $135,000, 37% from $135,001 to $190,000, and 45% above $190,000. Add the 2% Medicare Levy and most working Australians pay an effective marginal rate of either 32%, 39%, or 47%.

Inside super, concessional contributions are taxed at a flat 15%. So the saving per dollar sacrificed is roughly:

$50,000 salary: Marginal rate 18% (16% + 2% Medicare). Saving = 18% − 15% = 3 cents per dollar. Honestly modest — at this income level the 15% super tax barely beats the 16% bracket. Sacrifice is more about retirement-balance building than near-term tax wins.

$90,000 salary: Marginal rate 32% (30% + 2%). Saving = 17 cents per dollar. Sacrifice $10,000 and you keep $1,700 you would otherwise have given the ATO.

$150,000 salary: Marginal rate 39% (37% + 2%). Saving = 24 cents per dollar. Sacrifice $10,000 and you save $2,400.

$200,000 salary: Marginal rate 47% (45% + 2%). Saving = 32 cents per dollar — but be aware Division 293 may apply (more on this below), which halves the benefit by adding an extra 15% super tax.

You'll often see the saving expressed in a slightly different way: a sacrificed dollar lands in your super as 85 cents, while a take-home dollar at the 39% bracket lands in your savings account as 61 cents. So sacrificing into super effectively adds 39% to the size of every dollar you put aside — at no cost to your future returns, since super investment options mirror what you'd pick in a brokerage account.

The Carry-Forward Rule: Where Most People Leave Money on the Table

This is the part most Australians under 40 have never heard of. Since 1 July 2018, if your total super balance on the previous 30 June was under $500,000, any unused portion of your concessional cap can be carried forward for up to five financial years. That means in 2025-26 you may be able to contribute much more than $30,000 if you've underused your cap in any of the prior five years.

Here's a typical example. Imagine you're 32, on $110,000 a year, with a $180,000 super balance. Over the last five years your employer SG has averaged around $11,000 per year, leaving roughly $19,000 of unused cap each year — about $95,000 in total carry-forward room. In 2025-26 your $30,000 current-year cap plus that $95,000 means you could in theory put up to $125,000 into super at the concessional 15% rate. Most people will never actually have that much spare cash — but a one-off windfall (an inheritance, a property sale, a redundancy payment) is the classic moment where this rule unlocks an enormous tax saving that's otherwise invisible.

To check your unused cap, log into myGov, click into the ATO, and go to Super → Information → Carry-forward concessional contributions. The screen shows your unused cap year by year. Snap a screenshot of it now — it's the single most useful piece of personal-finance data the ATO publishes, and most people have never opened the page.

Division 293: The High Earner's Extra 15%

If your combined income — taxable income plus reportable fringe benefits, investment losses, and concessional contributions — exceeds $250,000, you become liable for Division 293. This is an additional 15% tax on the portion of your concessional contributions that pushes you over the threshold, levied directly on you (not your fund) via a notice of assessment after you lodge your return.

Practically, Division 293 means your effective super contributions tax doubles to 30% — still below the 47% top marginal rate, so sacrificing remains tax-effective for high earners, but the saving shrinks from 32 cents in the dollar to 17 cents. If you're close to the threshold, sometimes a partial sacrifice that keeps you just under $250,000 of combined income is the optimal play. A 15-minute conversation with a tax accountant before EOFY will more than pay for itself if this is your zone.

Salary Sacrifice vs Personal Deductible Contribution

There are now two ways to get money into super at the 15% concessional rate: pre-tax salary sacrifice, or post-tax personal contributions for which you claim a deduction in your tax return. Both end up taxed the same way inside super, both count toward the same $30,000 cap, and both give you the same headline tax saving. Which one to choose comes down to timing and convenience.

Salary sacrifice is set-and-forget — you fill in the HR form once and money flows automatically. The downside is that to make a meaningful contribution before 30 June, you generally need to set it up now, because there are only about 8 weekly or 4 monthly pay cycles left. If you're paid monthly and you start on 1 May, that's only 2 pays before EOFY (May and June).

Personal deductible contributions are the late-stage alternative. You make a lump-sum contribution from your savings account directly to your super fund any time before 30 June, then lodge a Notice of Intent to Claim a Deduction (NOI) with the fund, get the acknowledgement back, and claim the deduction on your 2025-26 tax return. This is the right move if you didn't get organised early enough for a full salary sacrifice, or if you've come into a chunk of cash you want to deploy quickly. The trap: you must lodge the NOI before the earlier of (a) lodging your tax return or (b) 30 June 2027, and the fund has to acknowledge it before you claim. Miss this paperwork and the contribution is treated as non-concessional, with no tax deduction.

The 8-Week Playbook: What to Do Between Now and 30 June

Here's a week-by-week sequence that gets the maximum benefit before EOFY without rushing.

Week 1 (this week, 30 Apr–6 May)

Pull your last three payslips. On each one, find the year-to-date "Employer Super" figure (sometimes shown as "SG" or "Super Guarantee"). Multiply it by 12/the number of months elapsed in this financial year to project your total employer SG for 2025-26. Subtract from $30,000 — that's your remaining current-year cap. Also, log into myGov, find the carry-forward screen, and write down the dollar figure of unused cap from prior years.

Week 2 (7–13 May)

Decide your target sacrifice amount. The honest budgeting question is "how much can I afford to lose from take-home pay between now and 30 June without dipping into emergency savings?" — multiplied roughly by 1.4 if you're on the 39% bracket, since the take-home cost is only 61 cents per dollar sacrificed. If your answer is "$3,000 hit to take-home," you're sacrificing about $4,900 gross.

Week 3 (14–20 May)

Submit the salary sacrifice form to your HR team. Most large employers require 1-2 pay cycles of notice, so timing matters here. Specify exactly: a percentage or fixed dollar amount per pay, the start date, and the super fund details (BSB, account number, USI). Confirm that your SG continues to be calculated on your full pre-sacrifice salary.

Week 4 (21–27 May)

Watch your next payslip carefully. Confirm three things: taxable income has dropped, super contributions reflect SG plus sacrifice, and PAYG withholding has dropped roughly proportionally to taxable income. If anything looks off, raise it with payroll immediately — fixing a mis-coded sacrifice in May is easy; fixing it in July is a year-long admin headache.

Week 5–6 (28 May–10 June)

If you have spare lump-sum cash available (e.g. from a tax refund, sale, or savings buffer above 3 months of expenses), prepare a personal deductible contribution to top up. Most super funds accept BPay; allow at least 5 business days for the contribution to be received and recorded by 30 June.

Week 7 (11–17 June)

Make the personal contribution. Immediately download the Notice of Intent form from your super fund's website (or use the online lodgement option in their member portal). Submit the NOI specifying the exact dollar amount you intend to claim as a deduction.

Week 8 (18–30 June)

Confirm the fund has received and processed both your sacrifice and any lump-sum contribution. Save the NOI acknowledgement letter — your accountant will need it for your 2025-26 return. Last day to contribute is the close of business on 30 June 2026 (a Tuesday this year), but in practice anything later than 25 June is gambling on bank processing times.

Five Mistakes That Cost People Money Every EOFY

1. Going Over the Cap

Excess concessional contributions are added back to your taxable income and taxed at your marginal rate, with an interest-style charge to recognise the timing benefit you got. The penalty is not catastrophic — it's not 47% twice — but it does eliminate the saving you were trying to capture. Always do the cap arithmetic including the full year's expected SG before deciding your sacrifice amount.

2. Forgetting the Notice of Intent

If you make a personal contribution but never lodge the NOI, the contribution sits in super taxed at 15% — but you get no deduction in your tax return. You've effectively donated money to your future self at the cost of your current self's tax bill. Set a calendar reminder.

3. Sacrificing Money You'll Need

Money in super is locked away until you reach preservation age (currently 60 for everyone born after 1 July 1964). Don't sacrifice your emergency fund, your house deposit, or money earmarked for a wedding or a baby. Build the buffer first.

4. Ignoring the First Home Super Saver Scheme

If you're saving for a first home and not yet a homeowner, the FHSSS lets you withdraw up to $50,000 of voluntary contributions plus deemed earnings at concessional tax rates to fund a deposit. Sacrificing into super and later releasing under FHSSS is one of the most tax-effective ways for a first home buyer to save — but it has to be voluntary contributions, not your SG, and the rules around timing are strict. Worth a separate conversation with a financial adviser.

5. Not Updating the Sacrifice After a Pay Rise

If you set your sacrifice as a fixed dollar amount three years ago and your salary has gone up, your effective sacrifice rate has fallen and you're probably under-using the cap. Review the figure every July and after any pay rise.

Should Younger Workers Even Bother?

This is the most common pushback we hear: "Why lock money away until I'm 60 when I could invest it now and access it whenever?" It's a fair question. The honest answer is that the tax discount on concessional contributions is large enough, and the compounding window long enough, that for most workers earning above about $50,000 the after-tax retirement balance from sacrificing $5,000 a year will materially exceed the after-tax balance from investing the same gross amount in a brokerage account, even after accounting for the lock-up.

That doesn't mean sacrifice everything you can. It does mean that ignoring sacrifice entirely is leaving compounding tax-arbitrage money on the table for 30+ years. A reasonable starting point for a worker in their 20s or 30s on $80k–$120k is to top up to about $20,000 in concessional contributions (roughly $9,000 in sacrifice on top of average SG), revisit annually, and bump it up alongside pay rises and income growth. That kind of cadence builds a meaningful retirement balance without cannibalising the cash you need for life now.

The Bottom Line

Salary sacrifice is one of the few financial moves where the tax code does most of the heavy lifting for you. The setup is one form, the maintenance is zero, and the saving compounds for decades inside a vehicle that's already taxed lower than almost any other investment in the country. The only friction is administrative — and the 8-week window between now and EOFY is more than enough to get it done if you start this week.

The single highest-leverage step you can take in the next 24 hours: log into myGov, open the carry-forward screen, and write down your unused cap. Knowing that number is the difference between a generic "I should put more into super" feeling and a concrete plan that actually moves the needle on 30 June.