Division 296's one-off cost base reset election is a rare thing in tax: a genuinely time-limited choice that cannot be revisited once the window closes. That makes the question of when trustees must decide just as important as whether they should elect at all. Miss the deadline and the option is generally gone for good, regardless of how beneficial it might have been. Yet the effective timeline starts well before the formal cut-off, because the decision depends on values fixed at a specific date. This article sets out the timing trustees need to have in mind.

The formal deadline

The election must be made by the due date of the fund's 2026–27 return. That is the hard deadline: the point by which an eligible fund that wants to make the election has to have made it. Because it is a one-off transitional choice tied to the commencement of Division 296 on 1 July 2026, it does not recur in later years, so missing the date generally forfeits the opportunity permanently.

The exact lodgment due date depends on a fund's circumstances and whether it uses a tax agent, so trustees should confirm their own fund's date rather than assume a generic one. What is universal is that the election is bound to that return and cannot be made afterwards, which gives the whole exercise a firm end point to plan back from.

Treating the lodgment due date as the finish line, and working backwards, is the right way to frame the timeline.

The valuation date comes first

Although the decision is formally due with the 2026–27 return, the substance of it is anchored to an earlier moment: the reset uses Market Value at 30 June 2026. That date, not the lodgment deadline, is what fixes the values the election turns on, so the relevant snapshot of the fund's Assets is taken at the very start of the regime.

This matters because valuations as at 30 June 2026 need to be supportable. For listed securities that is simple, but for property and unlisted assets it may require independent valuation evidence obtained at or referable to that date. Leaving the valuation question until the return is being prepared risks either a weak valuation or a scramble, so the practical work begins around 30 June 2026 even though the decision is lodged later.

Why the two dates create a timeline

Together, the 30 June 2026 valuation date and the 2026–27 lodgment deadline bookend a working period. The values are fixed at the start; the decision must be made by the end. In between sits the analysis: modelling each member's position, projecting likely realisations, and weighing the all-in, irrevocable reset against the fund's realistic future.

That analysis takes time and good information, so the sensible approach is to begin early rather than treat the election as a last-minute item at lodgment. A fund that gathers its 30 June 2026 valuations promptly and models the choice through the year reaches the deadline with a considered decision, rather than deciding under time pressure with incomplete data.

The cost of missing it

The consequence of missing the deadline is stark: the election is generally lost, and with it the ability to keep pre-commencement growth out of the Division 296 calculation for the fund's assets. For a fund that would have benefited, that is a permanent outcome with no second chance, because the transitional choice does not come around again.

This asymmetry is why timing deserves attention even from trustees who are unsure whether they will elect. Preserving the option, by getting valuations and analysis done in time, costs relatively little, whereas losing it through inattention cannot be undone. The deadline is not a formality to be met at the last minute; it is a genuine cliff edge.

Decide in time, even to decline

Deciding in time does not mean deciding to elect. A fund may work through the analysis and conclude that the election does not help, or could leave it worse off given the all-in reset, and choose not to make it. That is a perfectly valid outcome, and it is a decision, not a default reached by missing the deadline.

The goal is to reach the deadline having actively considered the election on good information, so that whichever way the fund goes, it is a choice rather than an accident. A fund that lets the deadline pass without analysis has not decided against electing; it has simply lost the option, which is a worse position than a considered no.

Building the timeline into the year

For trustees, the practical plan is to treat the 2026–27 year as the window in which this must be resolved: obtain supportable 30 June 2026 valuations early, engage the Accountant and a licensed adviser to model the election, and diarise the fund's actual lodgment due date as the hard stop. That turns a potentially stressful cliff edge into a managed process.

Because the election is irrevocable and the mechanics are still settling as the ATO clarifies its guidance, this is a decision to make carefully and with qualified advice rather than at speed. This article is general information only and is not tax advice; the timing and merits of the election for any particular fund should be confirmed with an appropriately qualified adviser.

The broader takeaway is that Division 296 introduces a new rhythm into the SMSF year for potentially affected funds, and the election is the first and sharpest example of it. Where previous years allowed valuations and decisions to be finalised comfortably at lodgment, the reset ties a consequential, irreversible choice to a valuation date at the very start of the regime. Funds that internalise that rhythm early, and treat 30 June 2026 values as something to capture rather than reconstruct, will handle not just the election but the ongoing measure far more smoothly than those who leave everything to the last return.

Practical takeaway

Division 296's cost base reset election must be made by the due date of the fund's 2026–27 return, and because the reset uses market value at 30 June 2026, the practical work, obtaining supportable valuations and modelling the choice, starts much earlier. Missing the deadline generally forfeits the option permanently, so trustees should confirm their fund's lodgment date, gather 30 June 2026 valuations early, and reach a considered decision, even if that decision is not to elect, with qualified advice.