Salary sacrifice vs personal deductible contributions: two roads to the same destination

If you're in your 50s or 60s and want to build your super before you stop working, putting extra pre-tax money in is one of the most effective moves available. What many people don't realise is that there are two different ways to do it — salary sacrifice, and personal deductible contributions — and they lead to almost exactly the same tax outcome. That's the first thing to understand: this is not a decision about tax efficiency. Both methods get money into super taxed at the concessional 15% rate rather than your marginal income tax rate, so the end result is essentially identical. The choice is about something more practical — timing, flexibility, cash flow, and one piece of paperwork that, done in the wrong order, can cost you the deduction entirely. This article is general information only, not personal advice.

What do the two methods have in common?

Both are concessional (pre-tax) contributions, which means both count toward the same concessional contributions cap — $32,500 for the 2026-27 year (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/caps-limits-and-tax-on-super-contributions/concessional-contributions-cap) — alongside the compulsory Super Guarantee (SG) your employer pays. Go over the cap by stacking them carelessly and you face excess-contributions tax. Both are taxed at 15% as they enter the fund, or an effective 30% for high earners caught by Division 293 tax, which applies once your combined income and concessional contributions exceed $250,000 and adds a further 15% (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/caps-limits-and-tax-on-super-contributions/division-293-tax-on-concessional-contributions-by-high-income-earners). Both reduce your assessable income, which can quietly help with things like the Medicare levy surcharge and the private health insurance rebate. And both can draw on the carry-forward (catch-up) rule, letting you use unused concessional cap from up to five earlier years if your total super balance was under $500,000 at the prior 30 June (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/caps-limits-and-tax-on-super-contributions/concessional-contributions-cap). So far, identical. Here's where they diverge.

How does salary sacrifice work?

Salary sacrifice is an arrangement with your employer to redirect part of your pre-tax salary into super before you earn it. Because it comes out of your gross pay, it reduces your taxable income automatically — there's no deduction to claim at tax time, it's already done. The catch is in the word "before": you can only sacrifice income you haven't earned yet, so it has to be set up in advance, and it relies on your employer offering the arrangement and administering it properly. One common myth worth killing: salary sacrifice does not reduce your Super Guarantee. Since reforms that took effect on 1 January 2020, salary-sacrificed amounts can't be used to reduce the earnings base on which your employer's compulsory SG is calculated (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/how-to-save-more-in-your-super/salary-sacrificing-super), so sacrificing extra into super doesn't cut the SG they owe you. (It's still worth checking your employer has this right.)

How do personal deductible contributions work?

A personal deductible contribution flips the order. You make the contribution from your own after-tax money — straight from your bank account into your super fund — and then claim a tax deduction for it afterwards. To get the deduction, you have to lodge a Notice of Intent to claim a deduction with your fund and receive the fund's acknowledgement. This is the step that trips people up. You must give the notice to your fund on or before the earlier of the day you lodge your tax return for the year the contribution was made, or the last day of the income year after the one in which you contributed — and crucially before you withdraw the money, roll it over to another fund, or start a pension with it, because once you've rolled over or withdrawn, a valid notice is limited to the proportion still held by the fund (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/how-to-save-more-in-your-super/personal-super-contributions). Get that order wrong and the deduction can be lost — the contribution still goes in, but you don't get the tax benefit you were counting on. The upside is flexibility: since the old "10% maximum earnings test" was removed from 1 July 2017, most employees can use this route too, not just the self-employed. You can decide to contribute at any time, including a single lump sum just before 30 June, once you can actually see what your income for the year looks like.

What differences actually decide it?

Because the tax result is the same, the decision comes down to how you want to manage it. On flexibility, salary sacrifice is locked in ahead of time, whereas a personal deductible contribution can be made whenever you like and sized to your actual income — ideal if your earnings are variable, if you get bonuses, or if you're self-employed. On cash flow, salary sacrifice smooths the contribution across every pay cycle so you barely notice it, while a personal deductible contribution needs you to have the cash on hand when you make it. On your employer, salary sacrifice depends on them offering and running it, whereas a personal deductible contribution bypasses the employer entirely — useful if they don't offer sacrifice or don't do it well. And on admin and risk, salary sacrifice is largely set-and-forget, while a personal deductible contribution puts the Notice of Intent paperwork on you, with a real cost if you get the timing wrong.

What do worked examples look like?

These show who each route tends to suit. They are illustrative only — not personal advice, and the rules and caps change.

David, 58, is a steady salaried employee earning $110,000, with a cooperative employer and a total super balance well under $500,000. He wants to add about $18,000 a year to his super on top of his employer's SG, comfortably within the $32,500 concessional cap (2026-27). On these facts, salary sacrifice is generally the cleaner fit for David: he arranges with his employer to redirect roughly $690 of pre-tax pay each fortnight, the money lands in super taxed at 15% instead of his marginal rate, and there's no annual paperwork and no Notice of Intent to remember (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/how-to-save-more-in-your-super/salary-sacrificing-super). His SG keeps being calculated on his full pre-sacrifice salary, so he loses nothing there. The smooth, automatic nature of the arrangement matches his steady income — he sets it up once and it runs itself, with only an annual check that he's tracking within the cap.

Susan, 61, runs her own consultancy with income that swings between $80,000 and $160,000 depending on the year, and she also has several years of unused concessional cap because her balance has been under $500,000. She doesn't know until late in the financial year how much she can comfortably contribute. On these facts, personal deductible contributions generally suit Susan better: she waits until May or June, sees where her income has landed, and makes a lump-sum contribution sized to her actual position — potentially using carry-forward cap to put in well above $32,500 in a strong year (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/caps-limits-and-tax-on-super-contributions/concessional-contributions-cap). On these facts the critical discipline for her is the paperwork order: she must make sure the fund receives the contribution before 30 June, then lodge her Notice of Intent and get the fund's acknowledgement before she lodges her tax return and before she touches that money (ATO, https://www.ato.gov.au/individuals-and-families/super-for-individuals-and-families/super/growing-and-keeping-track-of-your-super/how-to-save-more-in-your-super/personal-super-contributions). Done in that sequence, she gets the deduction; done out of order, she could lose it. Plenty of people in between do both — a modest salary sacrifice running through the year for discipline, topped up with a personal deductible contribution before 30 June once they know exactly where they've landed.

What traps should you avoid?

A few things are worth getting right. With the Notice of Intent, if you're claiming a personal deduction, lodge the notice and get your fund's acknowledgement before you lodge your tax return, and before you withdraw, roll over, or start a pension with that money. With the shared cap, remember that employer SG, salary sacrifice, and personal deductible contributions all count toward the one concessional cap, so add them up to avoid accidentally exceeding it. On 30 June timing, a personal deductible contribution has to be received by your fund before 30 June to count for that year, not just initiated on the day. And with Division 293, if you're a high earner the benefit is smaller — an effective 30% rather than 15% — which is still usually worthwhile but worth modelling. The tax outcome may be the same either way, but the practicalities aren't, and the Notice of Intent trap is the one most worth getting right. If your income is variable, you're close to the cap, or you're not sure which route fits, it's worth a conversation with an adviser before 30 June rather than after.

Sources

• ATO — Personal super contributions (including Notice of Intent)
• ATO — Salary sacrificing super
• ATO — Concessional contributions cap
• ATO — Division 293 tax on concessional contributions by high-income earners