Salary Sacrifice vs Personal Super Contribution (2025-26): Which Is Better?
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Primary tax-year context: 2025-26
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General information only. This is not tax or financial advice. Consult a registered tax agent for advice specific to your situation.
There are two common ways to make extra concessional (pre-tax) contributions to super beyond your employer’s Superannuation Guarantee: salary sacrifice or a personal deductible contribution. Both achieve the same tax outcome inside super — contributions are taxed at 15% rather than your marginal rate — but the mechanics, timing, and side-effects differ in ways that matter.
What they have in common
Both methods count as concessional contributions and are subject to the $30,000 concessional cap in 2025-26. That cap includes your employer’s SG (12% from 1 July 2025), any salary sacrifice, and any personal deductible contributions. Exceeding the cap triggers excess contributions tax at your marginal rate.
Both methods also reduce your taxable income, which can lower your Medicare Levy Surcharge (MLS) liability and, depending on method, your HELP repayment income.
How salary sacrifice works
Salary sacrifice is arranged through your employer before your pay is processed. You agree to forgo a portion of your pre-tax salary, and your employer pays that amount directly into your super fund alongside the SG contribution.
Because the sacrifice happens before tax is assessed, it reduces your taxable income and your reportable fringe benefits amount for MLS and HELP purposes. That makes it particularly effective if you are close to an MLS income threshold or carry a HELP debt — both are calculated on an income measure that includes salary sacrifice, so reducing gross salary directly reduces those obligations.
The trade-off is flexibility. You must agree to the arrangement in advance, and changing the amount requires going back to your employer’s payroll team. If you are unsure how much you want to contribute for the year, locking in a fixed amount can be awkward.
How a personal deductible contribution works
A personal deductible contribution is made from your after-tax bank account. You contribute when you choose, then claim a deduction in your tax return — but only if you first lodge a valid section 290-170 notice of intent with your super fund.
The notice must be lodged before you lodge your tax return and before 30 June of the income year following the contribution year. Miss that window and the contribution becomes non-concessional (no deduction, no 15% tax inside super — it simply counts against the non-concessional cap instead).
The key advantage is flexibility. You can decide the exact amount after the income year ends, once you know your total income and how much cap room you have. This is useful for variable-income earners, the self-employed, or anyone who wants to top up contributions at tax time.
However, personal contributions do not reduce your salary for HELP repayment income or MLS in the same way salary sacrifice does. The deduction reduces taxable income, but HELP repayment income adds back personal super deductions under the adjusted taxable income rules. Salary sacrifice avoids this because the income never enters your taxable salary to begin with.
Side-by-side comparison
| Salary sacrifice | Personal deductible contribution | |
|---|---|---|
| Timing | Agreed before pay is processed | Contributed anytime; deduction claimed at tax time |
| Who arranges it | Employer payroll | You, via bank transfer to fund |
| Section 290-170 notice required | No | Yes — must be lodged before tax return |
| Reduces HELP repayment income | Yes | No (added back under ATI rules) |
| Reduces MLS income | Yes | Partially — reduces taxable income but ATI adjustment applies |
| Flexibility to change amount | Low — requires payroll variation | High — decide amount after year-end |
| Counts toward concessional cap | Yes | Yes |
| Tax inside super | 15% | 15% |
Worked example: $10,000 extra contribution
Suppose you earn $100,000 and want to contribute an extra $10,000 to super on top of the employer SG.
Via salary sacrifice: Your employer reduces your gross salary to $90,000. You pay income tax on $90,000. The $10,000 enters super and is taxed at 15% ($1,500 contributions tax). Net into your super: $8,500. Your HELP repayment income is calculated on $90,000.
Via personal deductible contribution: You transfer $10,000 from your bank account to your super fund and lodge a valid notice of intent. You claim a $10,000 deduction in your tax return. Your taxable income falls to $90,000. The $10,000 is taxed at 15% inside super. Net into your super: $8,500. Your HELP repayment income is calculated on $100,000 less deduction, but the deduction is added back under adjusted taxable income rules — so repayment income stays closer to $100,000.
The after-income-tax saving is identical. The difference is the HELP and MLS treatment.
Which method is better?
- Choose salary sacrifice if you carry a HELP debt or are near an MLS threshold, or if you want a simple set-and-forget arrangement through payroll.
- Choose personal deductible contributions if your income is variable, you are self-employed, or you prefer to decide your contribution amount after the year ends.
Many people use both — salary sacrifice a base amount through payroll, then top up with a personal contribution at tax time if cap room remains.
Use the Salary Sacrifice Calculator to model the take-home pay impact before making changes.