Retrospective Property Valuation

A retrospective property valuation establishes what a property was worth on a specific date in the past — not today. It is also called a backdated valuation, and the two terms mean the same thing. Our RICS-Registered Valuer reconstructs the market as it stood on that date and delivers a report you can put in front of the ATO, a court, or an insurer.

The work is not a matter of taking today’s value and adjusting it backwards. A valuer assembles the evidence that existed at the effective date: comparable sales that settled around it, council and title records, historical aerial imagery showing what was actually built at the time, planning approvals, and contemporaneous market commentary. The property is then valued on that evidence alone, as if the intervening years had not happened. Anything the market learned later is set aside, because a buyer standing in that year could not have known it either.

That distinction is why a median price index cannot do this job, and why we do not offer a free retrospective valuation. Free automated estimates are built on current data and current comparables; pointed at a past date they produce a figure whose derivation you cannot show to a third party. A figure you cannot trace back to evidence is the figure that fails when someone asks how you arrived at it. The fee is quoted before you commit, so you can weigh it against the matter it supports.

People come to us for a past-dated value in a handful of recurring situations: establishing a capital gains tax cost base, deceased estate date-of-death valuations for executors and probate, family court matters, where the court generally works from values current at the hearing but a past-dated figure — often at separation — is needed alongside it, related-party transfers, where market value is substituted for the actual consideration on both sides of the transaction (ss 112-20 and 116-30 ITAA 1997), insurance claims valued at the date of loss, and property first rented out after being a main residence, where the date the property started producing income can matter to the cost base.

The 1 July 2027 CGT transitional regime adds another. For assets held across that date by individuals, partnerships and trusts — superannuation funds, including SMSFs, are excluded — the gain is apportioned across the reset date, and a contemporaneous market valuation is the most defensible way to support that apportionment. Taxpayers may instead apply a specified apportionment formula; the detailed method is to be set by legislative instrument and ATO practical guidance has not yet been published.

What you receive is a full valuation report, not a certificate or a letter of appraisal. It states the effective date and the basis of value, identifies the property as it existed then, lists the comparable evidence relied on with the reasoning that connects it to the assessed figure, and carries the signature of a Chartered Valuation Surveyor holding RICS-Registered Valuer status. It is prepared to RICS Red Book Global Standards 2025. That structure is what makes it defensible: an assessor or a judge can follow the reasoning back to the evidence rather than taking the number on trust.

How far back we can go depends on the location more than the year. Any historical date is possible in principle, including pre-CGT dates before 20 September 1985. What varies is the depth of the record. Metropolitan and established regional markets have dense sales archives going back decades; remote areas, thinly traded localities and unusual property types have fewer contemporaneous transactions, so the evidence base is narrower and the report says so plainly rather than projecting false precision.

Turnaround scales with how far back the effective date sits, because older dates mean more archival retrieval: roughly 7-10 business days for recent dates within the last five to ten years, 10-15 days for mid-range dates, and up to 25 days for long-range work going back 40 years or more. Priority service is available where an ATO deadline or a probate-driven sale timeline is fixed. Fees are quoted per property rather than published, because the effective date, the property type and the state of the historical record change the work involved — tell us the address, the date and the purpose and you will have a fixed fee within one business day.

We prepare retrospective valuations across every state and territory, including Sydney, Melbourne, Brisbane, Perth, Adelaide, Canberra and regional Australia.

Want the methodology in depth? Read the retrospective valuation for CGT cost base pillar guide, which covers the ATO acceptance scenarios and the full evidence-base methodology, or retrospective valuations beyond CGT for the non-tax situations. For market context behind a particular historical date, see Australian house prices 1980–2026 by capital city.