New CGT Rules: Why Every Investor Needs a July 2027 Valuation

New capital gains tax rules taking effect in July 2027 make a professional property valuation potentially worth $58,000 or more to investors.

A new whitepaper from JLL has quantified what property investors are only beginning to grapple with: the difference between commissioning a professional property valuation before 1 July 2027 and relying on the Australian Taxation Office's default calculation could be worth more than $58,000 in tax.

Australian Broker reports that from 1 July 2027, the current 50% capital gains tax (CGT) discount on investment property will be replaced with an inflation-indexed cost base and a 30% minimum tax on real gains. The changes are already law, having passed parliament in June, giving investors a defined window to act.

Residential properties bought before 12 May retain their grandfathered negative gearing entitlements. But the CGT changes apply to a much broader group: any investor who holds property through to or beyond July 2027 needs to understand the new rules.

How the Numbers Stack Up

JLL's modelling puts the stakes in concrete terms.

Take a Sydney investment property bought for $800,000 in 2020, valued at roughly $1.2 million by mid-2027, and ultimately sold in 2032 for $1.8 million.

If the investor commissions a professional valuation to lock in that $1.2 million baseline on 1 July 2027, the eventual tax bill comes to approximately $208,680.

If they instead rely on the ATO's default formula — which assumes even appreciation across the entire holding period, regardless of how the market actually moved — that figure rises to $266,960.

The difference: $58,280. As the JLL whitepaper puts it, this is the amount "paid simply because they didn't spend $500 on a professional valuation."

The logic behind the gap comes down to how the new rules split capital gains. For any property held before 1 July 2027 and sold afterwards, the gain is divided into two phases:

- **Growth up to 1 July 2027** retains the existing 50% CGT discount - **Growth from 1 July 2027 onwards** falls under the new inflation-indexed cost base and the 30% minimum tax

This makes the property's value on that specific date the critical reference point. Investors have two ways to establish it: commission an independent valuation, or default to the ATO's straight-line growth formula. The ATO formula assumes even appreciation over the entire holding period regardless of how the market actually moved — which in most Australian capital cities over the past several years is far from the reality.

Who Is Most Exposed

The changes catch a wider group than many investors realise.

**Pre-1985 properties**, which were previously exempt from CGT altogether, will become taxable on any growth from 1 July 2027 onwards. For these properties, where there is no original purchase price on record, a 2027 valuation is the only way to establish a meaningful baseline. It is essential, not optional.

**Discretionary trust structures** face additional complexity. A 30% minimum tax on trust distributions takes effect from 1 July 2028, adding a further layer for investors holding property in family trust structures. Testamentary trusts are excluded from that particular measure.

One important point the whitepaper makes clear: selling before the July 2027 deadline offers no particular advantage. Gains built up to 1 July 2027 are already protected under the transitional rules, regardless of when the property is eventually sold. There is no need to rush to market simply to preserve those entitlements.

That said, the looming deadline appears to already be influencing market behaviour. Senior economist Anne Flaherty has noted that the upcoming CGT changes "could also be incentivising more sellers to head to market sooner," contributing to the 13.3% year-on-year rise in new listings recorded nationally in June.

What Investors Should Do Before July 2027

The practical steps are straightforward, even if the tax law is not.

First, review your portfolio and identify any properties you are likely to hold through July 2027. For each, consider whether the property has experienced uneven growth that the ATO's straight-line formula would not accurately capture. Properties that appreciated sharply in recent years are the most likely candidates for a significant gap between the independent valuation and the ATO default.

Second, commission a professional valuation well before the deadline. As more investors wake up to this issue, demand for valuations will rise and lead times may stretch. Early movers will have more choice and potentially quicker turnaround.

Third, speak with a qualified tax adviser or accountant about your specific situation. The interaction between the new CGT rules, negative gearing grandfathering, and trust structures is complex. General guidance is a starting point, not a substitute for personalised advice.

If the tax changes are prompting you to review your investment property lending, it is also a good time to compare your current loan terms. Recent data shows non-major lenders actively gaining share in the investor lending market, suggesting genuine competition remains for borrowers willing to look beyond their existing bank. Compare current investor home loans, use our borrowing power calculator to model different scenarios, or check our refinance savings calculator to see whether a switch makes financial sense alongside a tax review.

Source: Australian Broker