Property Investors: Why the 1 July 2027 Valuation Matters
The CGT reform replacing the 50% discount is now law — and the transitional valuation date is less than 10 months away.
Most property investors in Australia have by now heard that the 50 per cent CGT discount is on its way out. Fewer have worked through what that actually means in practice — and specifically what concrete step needs to happen before 1 July 2027 to protect the value built up over their holding period.
Property Update reports that the Treasury Laws Amendment (Tax Reform No. 1) Act 2026 received Royal Assent on 26 June 2026. This is not a proposal or an exposure draft. It is law, and it takes effect on 1 July 2027.
What Changes and Who It Affects
From 1 July 2027, for CGT assets held by individuals, trusts and partnerships, three changes apply. The 50 per cent CGT discount is replaced by cost base indexation, which adjusts your cost base for inflation rather than halving the gain. A minimum 30 per cent tax applies to net capital gains on assets held for more than 12 months. And negative gearing on established residential property is limited to new builds, with properties held at 7:30 pm AEST on 12 May 2026 grandfathered under the existing rules.
The negative gearing change has dominated the conversation, largely because the grandfathering provision protects a large number of existing investors from that element. The CGT discount change has no equivalent carve-out. It applies to every affected asset regardless of when you purchased it. That is the part that is easy to underestimate.
Superannuation funds are not affected by the discount change. The main residence exemption is untouched.
The Transitional Valuation: Why the Date Matters
The legislation handles the transition by splitting the gain on any affected property into two segments. Your investment property is treated as though you disposed of it and reacquired it at market value on 1 July 2027. Gains that accrued before that date remain under the old rules and keep the 50 per cent discount. Gains that accrue after 1 July 2027 fall under the new indexation and minimum-tax framework.
The 1 July 2027 market value is therefore not optional documentation. It is a permanent figure attached to your property file that you will need to use in a tax return when you eventually sell — potentially years or decades from now. Its accuracy determines how much of your total gain sits under the old rules and how much sits under the new ones.
There are two ways to establish this figure. The first is the Treasury's apportioning formula, which estimates the value by assuming your property grew at a steady average rate across the entire holding period. The second is an independent market valuation obtained close to 1 July 2027.
The formula is free. The problem is that it rests on an assumption — smooth, linear growth — that accurately describes very few Australian investment properties. Markets like Perth, Brisbane and Sydney have all experienced pronounced cycles: extended flat stretches followed by sharp runs. Properties with renovation histories carry capital improvements that landed at specific points in time, not spread evenly across the holding period.
Where a property's growth pattern doesn't follow a straight line, the formula's output will be inaccurate. If it understates the market value at 1 July 2027, a larger portion of what is actually pre-2027 growth gets classified as post-2027 gain — losing the 50 per cent discount and picking up indexation and the minimum 30 per cent tax instead.
Pre-1985 property owners face a specific risk. Gains accrued before CGT applied remain exempt up to 1 July 2027, but the exemption does not extend past that date. For anyone who has held a property since the 1970s or early 1980s, the 1 July 2027 value is the line between a lifetime of exempt growth and a taxable future — making an accurate valuation particularly important.
There is also a practical timing consideration. The formula is elected at the point of sale. If you sell in 2032 and decide at that point that the formula doesn't suit your property, you are facing a retrospective valuation for a date years in the past, built from archived sales evidence. A valuation commissioned close to 1 July 2027, with the market available for the valuer to assess directly, is more straightforward and more defensible.
How to Decide Whether You Need an Independent Valuation
Not every property justifies the exercise. Property Update suggests filtering your portfolio through a checklist with your accountant.
Properties worth prioritising for an independent valuation include those with a large accumulated gain or high overall value — because the bigger the number, the more a percentage point of error costs. Long-held properties, particularly pre-1985 ones, deserve particular focus given the exemption boundary. Any property that has been renovated or improved is a poor candidate for the formula, which cannot see capital works and will spread their effect across years they did not exist. Properties you might sell within the next decade are worth valuing sooner.
Properties that are reasonable candidates for the formula are those purchased more recently, in a stable market, with no improvements, in a suburb full of comparable stock. Be honest about how many of your holdings genuinely fit that description.
For property investors assessing how their financing structure interacts with a possible sale or refinance in the years ahead, this conversation is worth having with your accountant and mortgage broker now. Understanding how your current loan structure and equity position interact with the post-2027 tax landscape may also affect decisions about whether to refinance or hold your current arrangement.
The ten months between now and 1 July 2027 is enough time to act properly — but not enough to keep deferring the conversation.