Sell Before or After 1 July 2027? CGT Implications for Investment Property Owners

Introduction

The 2026-27 Budget reform introduces a CGT methodology change for residential investment property sold on or after 1 July 2027. The old 50% discount continues to apply to pre-July 2027 portions of gain; CPI indexation plus 30% minimum tax applies to post-July 2027 portions. For investors contemplating a sale around the transition date, the decision involves real but modest tax differences.

This article works through the comparison, using the Michael example from the budget papers, and frames a clear decision-making approach.

The Two CGT Regimes

Sale before 1 July 2027

The entire capital gain (sale price minus cost base) is calculated under existing rules. After 12-month holding, the 50% discount applies, and the discounted gain is taxed at the investor's marginal rate.

Sale on or after 1 July 2027

The gain is split into two components:

• Pre-July 2027 portion: Calculated using transitional market valuation at 30 June 2027. 50% discount applies.
• Post-July 2027 portion: Calculated as sale price minus indexed transitional value. CPI indexation lifts the cost base; 30% minimum effective tax rate applies.

Michael Example: Detailed Comparison

From the budget papers: Michael holds a grandfathered property. He is considering selling it either just before 1 July 2027 or two years after.

Scenario A: Sale just before 1 July 2027

• Sale price: $500,000 (current market value)
• Cost base: $400,000 (acquired some years earlier)
• Capital gain: $100,000
• 50% discount: $50,000 included in assessable income
• Tax at 45% marginal rate: $22,500

Scenario B: Sale 2 years post-commencement

• Sale price (after 2 years growth): $560,000
• Pre-July 2027 transitional value: $500,000
• Pre-July 2027 gain: $500,000 - $400,000 = $100,000, 50% discount = $50,000 assessable
• Post-July 2027 gain: $560,000 - $500,000 = $60,000 nominal
• CPI indexation (2.5%): indexed cost base $500,000 × 1.025 = $512,500
• Post-July 2027 indexed gain: $560,000 - $512,500 = $47,500 (approx, depending on method)
• Total assessable: $50,000 + $34,688 ≈ $84,688
• Tax: $16,303 (the Michael example's headline figure for the post-commencement component) plus pre-commencement portion

Adjusted for the extra growth in the two years held (which generates more tax in either scenario), the headline difference attributable specifically to the rule change is approximately $2,200 the figure quoted in the budget papers.

When Selling Before 1 July 2027 Is Better

The old 50% discount tends to produce a more favourable outcome when:

• The investor has a very high marginal rate (45%+) and the 30% minimum tax floor would not otherwise bind.
• Inflation is expected to be low over the following holding period (limited CPI uplift benefit).
• Holding period is short (less time for CPI indexation to accrue).
• Capital growth is expected to be slow or negative (no further gain to defer).

For high-income investors selling within a year or two of 1 July 2027, the old rules typically produce a slightly better outcome by a few thousand dollars on a typical residential property sale.

When Selling After Can Be Better

The post-July 2027 rules can produce a comparable or better outcome when:

• The investor's marginal rate is at or below 30% (the 30% floor doesn't add anything).
• Investor receives Age Pension or JobSeeker (30% floor doesn't apply).
• Inflation is high (more substantial CPI uplift of cost base).
• Holding period after 1 July 2027 is long (CPI compounds).
• Carry-forward losses can be applied against the gain (reducing taxable amount).

The Transitional Valuation

For any sale after 1 July 2027 of a property owned before that date, the transitional market valuation at 30 June 2027 is the pivotal number. It determines:

• The size of the pre-July 2027 gain (50% discount eligible)
• The starting cost base for post-July 2027 CPI indexation

A higher transitional valuation means more gain is allocated to the favourable pre-July 2027 method and less to the post-July 2027 method. Investors should obtain a formal valuation as close as possible to 30 June 2027 and retain it in tax records.

The ATO will also offer a safe-harbour method (cost base indexed by CPI to 30 June 2027), but a formal valuation will typically produce a more favourable outcome where the property has appreciated faster than CPI.

Market Conditions vs Tax Timing

Investors contemplating sale around the transition should remember that property market movements typically dwarf the tax difference:

• A 3% market move on a $700K property is $21,000 many times the typical tax difference.
• Selling into a soft market to "beat" a tax deadline can cost more than the tax saving.
• Selling into a strong market post-deadline can outweigh any tax disadvantage.

The correct framing: identify the right time to sell on market grounds first. Then optimise tax timing within that window. Do not let tax be the primary driver.