It’s all-or-nothing, and it’s irreversible
The election applies at the fund level, not asset-by-asset. If you opt in, every asset has its Division 296 cost base reset to market value at 30 June 2026 — including assets sitting in unrealised loss positions, which would otherwise be preserved.
For funds with mostly gains, opting in is usually the right call. For funds with a mix of gains and losses, the maths needs running carefully. Once made, the election can’t be reversed.
The election must be made in the ATO’s approved form, on or before the due date for lodging the fund’s 2026-27 income tax return. Any SMSF can opt in — even funds where no member is currently above $3M. This is relevant if members are expected to exceed the threshold in future, and the fund holds long-held assets with significant unrealised gains.