After 1 July 2027, who pays more CGT?
Tax on 5 years of post-2027 growth per $100 of 30 June 2027 value, 47% taxpayer, by yearly growth. Data as at 18 September 2026.
Quick answer
On our illustrative assumptions the new rules cost less below about 4.8% growth a year and more above it. The gain up to 30 June 2027 keeps the 50% discount either way.

The data
| Growth | Old rules (50% discount) | New rules (indexation, 30% floor) |
|---|---|---|
| 3% a year | $3.70 | $1.30 |
| 4% | $5.10 | $4.00 |
| 5% | $6.50 | $6.80 |
| 6% | $7.90 | $9.70 |
| 8% | $11.00 | $15.90 |
Our illustrative modelling: CPI 2.5% a year, five-year hold to 30 June 2032, 47% rate including the Medicare levy. General information, not advice. Source: Our analysis of the Treasury Laws Amendment (Tax Reform No. 1) Act 2026. Data as at 18 September 2026.
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