Model Your Super Split: When to Unlock Up to 85% for Australian Couples

You can generally split up to 85% of your taxed splittable concessional contributions to your spouse, but your spouse must be under preservation age, or between preservation age and 65 without being retired. The transfer is processed as a rollover, not a new contribution, and your fund decides whether and when to act on it.

TL;DR:

• You can split up to 85% of taxed splittable contributions, but only within your concessional cap limit, which is $32,500 for 2026-27.
• Spouses eligible for splitting must be under preservation age or between preservation age and 65 without having met a retirement condition.
• The split transfer is treated as a rollover, meaning it does not affect either spouse’s contribution caps or incur a tax offset.
• Confirm fund eligibility and process timing before applying, and ensure no simultaneous claims for deduction are made on the same contributions to avoid invalidating the split.
• Running scenario comparisons with professional advice or modeling tools helps determine if splitting improves long-term household retirement outcomes.

Table of Contents

• How contribution splitting works: rollover mechanics and tax treatment
• Eligibility: who can receive split contributions and age tests
• What you can split and how the caps limit you
• How and when to apply: steps, forms, and timing
• When splitting pays off: household scenarios and decision heuristics
• Common pitfalls that derail a split
• Aerowealth Team perspective: model before you split
• Model contribution-splitting scenarios with AeroWealth
• Sources
• FAQ

How contribution splitting works: rollover mechanics and tax treatment

When you apply to split, the amount moved to your spouse’s account is called a contributions-splitting super benefit. It leaves your account and lands in theirs, but the ATO still counts the original contribution against your own concessional cap, not your spouse’s. Your spouse does not use up any of their own contribution caps when they receive it, because the transfer is treated as a rollover rather than a fresh contribution.

This distinction matters for reporting and for planning:

• The contribution stays attributed to you for cap purposes and Division 293 calculations.
• Your spouse’s account grows without touching their concessional or non-concessional limits.
• No tax offset applies to the transfer itself, unlike a genuine spouse contribution.

Because the mechanics sit closer to an internal transfer than a new deposit, splitting changes where money sits, not who originally earned the tax treatment on it.

Eligibility: who can receive split contributions and age tests

Your spouse’s age and work status decide whether they can receive a split at all. Anyone under their preservation age can receive contributions without restriction. Between preservation age and 65, they can still receive a split as long as they have not met a retirement condition of release. Once they turn 65, they are no longer eligible to receive a split, regardless of their work status.

A few other points shape who qualifies:

• “Spouse” covers a married partner, a de facto partner, or someone in a registered relationship, same-sex or opposite-sex.
• The receiving spouse does not need to be a member of your same fund, but they do need their own account somewhere.
• Funds retain discretion over whether they offer splitting at all, and some choose not to, so it is worth checking before you plan around it.

What you can split and how the caps limit you

Taxed splittable contributions include employer contributions (including salary sacrifice) and personal contributions you have claimed as a tax deduction. Co-contributions, personal contributions you have not claimed, and most other non-concessional amounts cannot be split.

You can split up to 85% of your taxed splittable contributions in a year, capped by the concessional contributions cap of $32,500 for 2026-27. That 85% figure accounts for the 15% contributions tax already deducted inside the fund, so you are never splitting more than what actually lands in your account after tax.

A few additional rules apply:

• The amount you can split can never exceed your concessional cap for that year, even if 85% of your contributions is a larger number.
• Unused concessional cap space you carry forward from prior years can increase how much you contribute and therefore how much is available to split.
• Some public-sector funds allow untaxed splittable employer contributions to be transferred at up to 100%, under scheme-specific rules you need to confirm with the fund.

How and when to apply: steps, forms, and timing

Splitting follows a fixed annual cycle, and missing the window means waiting another year.

1. Confirm your fund actually offers contribution splitting and ask which form they require.
2. Complete the ATO’s Superannuation contributions splitting application (NAT 15237) or your fund’s own equivalent.
3. Gather your spouse’s fund ABN and member number before you start the form.
4. Lodge the application in the financial year immediately following the year the contributions were made.
5. Confirm your spouse’s account can receive the transfer, since accounts already in pension phase typically cannot.

You can only split contributions from one financial year per application, and most funds process one split per member per year.

Pro Tip: Call your fund before the end of the financial year to confirm processing times, since some take weeks to action a split and delays can push you past the application deadline.

When splitting pays off: household scenarios and decision heuristics

Splitting earns its place in a strategy when it changes what your household can do next, not just where the balance sits. A few situations where it tends to help:

• One spouse has a much lower total super balance and splitting keeps them under the threshold needed to access unused concessional carry-forward space.
• A spouse is approaching the non-concessional contributions pivot points tied to total super balance, and reducing one partner’s balance preserves room for further non-concessional contributions.
• You want to equalize access dates between partners heading toward retirement around the same time.

Splitting is a different tool from a direct spouse contribution, which can attract a tax offset of up to $540 on the ATO’s own guidance. A spouse contribution adds new money into the system and can earn that offset, while splitting simply reallocates money you already contributed. Choosing between them depends on whether your goal is adding new super savings or redistributing what already exists, and in many households the right answer is doing both at different points in the year.

Common pitfalls that derail a split

The most expensive mistake is sequencing. If you plan to claim a tax deduction on personal contributions and also split them, you must lodge your notice of intent to claim a deduction with your fund before or at the same time as the splitting application. Get the order wrong and the split can be invalidated entirely.

A few other traps to watch for:

• Splitting does not reduce your own reported contributions or your Division 293 exposure, since the amount still counts against your cap.
• Your spouse’s account needs to be open and able to receive contributions, not already converted to pension phase.
• Some funds charge a processing fee for splitting or simply decline to offer it, so confirm both before you count on it.

Pro Tip: Lodge your notice of intent to claim a deduction the same day you submit your splitting application, so there is no gap for the fund to question the order.

Aerowealth Team perspective: model before you split

Splitting looks simple on paper, but the real payoff depends on how it interacts with carry-forward caps, Division 293 thresholds, and Age Pension asset tests years down the line. Running side-by-side scenarios before you act shows whether splitting, a spouse contribution, or a mix of both leaves your household better off. Talk specifics through with your fund or a licensed adviser before you lodge anything.

— Aerowealth Team

Model contribution-splitting scenarios with AeroWealth

AeroWealth projects how splitting, spouse contributions, and carry-forward caps play out together across your retirement timeline, so you can see the long-term effect on both partners’ balances before you file a form.

• Compare splitting against a direct spouse contribution side by side under Australian contribution rules.
• Start on the Free plan or check Pro pricing at $7 AUD per month for expanded scenario comparisons and stress tests.
• AeroWealth models outcomes, it does not replace tax or legal advice, so confirm final steps with your fund or a tax adviser.

See how your own numbers play out on the AeroWealth platform.

FAQ

What are the rules for superannuation contribution splitting?

You can apply to split up to 85% of your taxed splittable contributions to your spouse’s super account, capped at your concessional contributions limit. Your spouse must be under preservation age, or between preservation age and 65 without meeting a retirement test, and your fund must agree to process the split.

Can I put $300,000 into my super?

A single lump sum of that size is not part of contribution splitting, but eligible individuals can make a downsizer contribution of up to $300,000 each after selling a qualifying home. Downsizer contributions sit outside the concessional and non-concessional caps and follow their own eligibility rules.

What happens if I contribute more than $32,500 to super?

Contributions above the 2026-27 concessional cap of $32,500 are generally taxed at your marginal rate rather than the concessional 15% rate, though unused cap amounts from prior years can sometimes be carried forward to lift your limit. Splitting contributions to a spouse does not reduce how much counts against your own cap.

What is the 4% superannuation rule?

There is no official “4% rule” in Australian superannuation guidance from the ATO or MoneySmart. Readers sometimes borrow this figure from overseas retirement withdrawal concepts, but it is not a standard applied to Australian super accounts, so treat any such reference with caution.

Recommended

• Can You Access Super at 55? A Practical Australian Guide
• Best Super Calculators in Australia for Retirement Planning
• Spouse Super Contribution: Eligibility, Tax Offset & Steps