Updated 29 August 2026
A retrospective property valuation establishes what a property was worth at a specific date in the past, using sales evidence from that period rather than today's market. It is the report the ATO expects where a cost base, a date of death value or a separation date value has to be proven years after the event.
At a glance
A retrospective property valuation determines a property's market value as at a nominated past date. The valuer works from sales that settled around that date, market conditions as they were, and the property's condition at the time, then applies the same method that would be used for a current valuation.
The terms backdated valuation and historical valuation mean the same thing. What distinguishes the exercise is not the method but the evidence base: everything used has to be contemporaneous with the valuation date, because a value at March 2019 has nothing to do with what the market did in 2024.
A retrospective report is a capital gains tax valuation with a past effective date. These valuations exist because tax law fixes values at moments that have already passed. Someone rented out a home eleven years ago. Someone died. A couple separated. A property changed hands within a family at a price that was never market value. In each case the law needs a number for that date, and the number has to be established after the fact.
| Retrospective valuation | Current valuation | |
|---|---|---|
| Valuation date | A specified past date | Today |
| Sales evidence | Sales settled around the past date | Recent and current sales |
| Property condition | Condition as at the past date, reconstructed from records | Condition as it is now |
| Inspection | Usually not useful; the property has since changed | Optional, depending on the report type |
| Typical use | Cost base resets, deceased estates, separation dates, past transfers | Current sale, current transfer, annual compliance |
| Our fee | $297 residential, $594 commercial | $297 residential, $594 commercial |
The two reports cost the same. A retrospective date takes more research, but the sales evidence for a settled historical period is fixed and complete, which offsets it.
Section 118-192 ITAA 1997 resets the cost base of a former main residence to its market value on the day it first produced income, where the first income use occurred after 20 August 1996 and a full main residence exemption would have covered a sale just beforehand. The reset is mandatory where it applies. Most people who converted a home to a rental never obtained a valuation at the time, which is why this is the single most common retrospective date we are asked for. See home to investment valuations.
Under Division 128 the death of an owner is not a CGT event; the tax is deferred until the asset is later sold. Where the deceased acquired the property before 20 September 1985, or where it was their main residence and not producing income just before death, the first element of the cost base becomes the market value at the date of death. Estates are frequently administered and sold years after the death, so the date of death value has to be reconstructed. See deceased estate valuations.
Family law settlements often need value at separation rather than value today, particularly where the parties separated some time before the matter resolved. The same report supports the settlement position and the CGT position of whoever retains the property. See family law valuations.
Where property moved between family members, into a trust, or into an SMSF at other than an arm's length price, sections 116-30 and 112-20 substitute market value on both sides of the transaction. If the transfer happened years ago and no valuation was obtained, the market value for that date still has to be established. See related party transfers.
Properties acquired before 20 September 1985 can need a 1985 value where Division 149 has stripped pre-CGT status, and now need a 1 July 2027 value under the enacted reform. See pre-CGT valuations.
Funds that missed a 30 June market value, or that need to support the Division 296 cost base reset election at 30 June 2026, need that specific historical date valued. Annual SMSF compliance valuations are handled by our sister practice at SMSF Property Valuations; where the requirement is CGT-driven we prepare it here.
Warning
Evidence thins with timeRetrospective valuations are legitimate and routine, but they are strongest when the trigger date is recent. Sales records survive, but condition evidence does not: photographs, agent listings, renovation records and the memory of what the property was actually like all fade. If you know a date has already been triggered, the cheapest version of this report is the one ordered now rather than at sale.
Backdated market valuations for any date the ATO or a court requires. Prepared and signed by a Chartered Accountant and Certified Property Valuer. Residential $297, commercial $594, AUD inc. GST, delivered in 24 to 48 hours.
Start your orderHow it worksThe process is the same discipline as a current valuation, run against a fixed historical window.
Where the property has since been demolished, subdivided or substantially renovated, the valuation still proceeds. It values what existed at the date, not what stands there now, which is exactly why documentary evidence rather than a site visit is what the exercise depends on.
There is no legal limit. In practice, the constraint is evidence. Valuations for dates in the past 25 years are routine in urban and suburban markets, where digitised sales records are complete. Earlier dates, including 20 September 1985 and before, are achievable where records survive, which is more often than owners expect.
What makes an early date harder:
None of these are automatic barriers. They change how much supporting research the report needs. If a date looks difficult, we will tell you before you commit, not after.
The fee is small relative to what the figure decides. The value at the trigger date usually becomes the first element of the cost base, and every dollar it is understated by is a dollar of gain that gets taxed.
Note
Worked exampleA Brisbane home bought in 2009 for $410,000. The owner moved out and rented it out in March 2017, then sells in 2026 for $980,000 with $26,000 of selling costs. No valuation was obtained in 2017.
Guessing the 2017 value. The owner's recollection is "about $600,000", with nothing to support it. If the ATO reduces that figure to $560,000 on review, the assessable gain rises by $40,000 before any discount, and shortfall penalties for failure to take reasonable care can add 25 per cent of the resulting shortfall on top.
A retrospective valuation at March 2017 establishes the figure from sales that settled around that date, adjusted and documented. Suppose it supports $640,000. The cost base becomes $640,000 plus $26,000 of selling costs, so the gain is $314,000 rather than the $354,000 that a $600,000 estimate would have produced. At a 37 per cent marginal rate plus the 2 per cent Medicare levy, and after the 50 per cent discount, the $40,000 difference is roughly $7,800 of tax, against a $297 fee.
Note the six-year absence rule in section 118-145 may reduce or remove the assessable portion entirely, depending on the owner's circumstances. The valuation is what makes any of those calculations possible.
The second benefit is harder to price. A documented valuation converts an argument into a position. If the return is reviewed, your accountant hands over a report rather than reconstructing a decade-old estimate under time pressure.
Yes. The ATO's own guidance contemplates retrospective assessments and asks that a report state whether it is one. What it assesses is whether the value is objective and supportable: an appropriate method, real comparable evidence from the right period, documented reasoning, and a qualified independent valuer.
A valuation prepared by a professional valuer also supports your position on penalties. Under section 284-90 of Schedule 1 to the Taxation Administration Act 1953, shortfall penalties run at 25 per cent for failure to take reasonable care, 50 per cent for recklessness and 75 per cent for intentional disregard. Engaging a qualified valuer and instructing them properly is the conduct that demonstrates reasonable care.
What the ATO does not accept as a substitute is an agent appraisal, an online estimate, or a figure with no working behind it. Those are covered in agent appraisal versus valuation.
Lodging a return with an estimated value is common and it is not the end of the matter. Two routes are usually available.
Voluntary disclosure before the ATO raises the issue also affects penalties, which is a conversation for your accountant rather than your valuer. What we can say is that the sooner a supportable figure exists, the more options remain open. Amendment and objection periods vary with circumstances, so confirm the deadlines that apply to you before relying on them.
The Treasury Laws Amendment (Tax Reform No. 1) Act 2026, which received Royal Assent on 26 June 2026, replaces the 50 per cent CGT discount with CPI cost base indexation and a 30 per cent minimum tax for individuals, trusts and partnerships from 1 July 2027. Affected assets are treated as disposed of and reacquired at market value on that date.
For anyone holding property across that date, 1 July 2027 becomes a fixed valuation date that will be needed at some point, possibly decades later when the property is finally sold. Owners have a choice: obtain a valuation while the evidence is current, elect the apportioning method under subsections 112-155(3) and 112-165(3), or do nothing and commission a retrospective valuation for 1 July 2027 years down the track.
The third option is the most expensive version of the same exercise. The ATO's apportionment formula has not yet been released as a legislative instrument, so the second cannot yet be modelled precisely. Detail on the 1 July 2027 valuation page.
Generally no, and for most retrospective dates an inspection adds nothing. The property today is not the property as it was at the valuation date, so what an inspection would record is the wrong thing. Our reports are desktop valuations built on documentary evidence and historical sales, which is the appropriate approach for a past date.
Where the current condition genuinely bears on the historical value, for example an unusual property with no comparable stock, we will say so and discuss the options before proceeding. The three report types are compared in kerbside versus desktop versus full valuation.
The more of this you can provide, the stronger the report. None of it is mandatory.
| Report | Fee (AUD inc. GST) | Turnaround |
|---|---|---|
| Residential, any past date | $297 | 24 to 48 hours |
| Commercial, any past date | $594 | 24 to 48 hours |
Fixed fee quoted before we start, with no variation once the scope is agreed. Reports are addressed and billed to you or your adviser.
Retrospective work is where the difference between a valuer and everyone else is starkest. An agent can form a view on today's market from what is selling now. A quantity surveyor estimates construction costs. Neither is equipped to reconstruct a market as it stood on a specific day years ago and defend that figure against review.
Our reports are prepared and signed by a Chartered Accountant who is also a Certified Property Valuer and a Registered Tax Agent (TPB 17532009). The practical benefit is that the report matches the provision it was ordered for. The valuation date, the interest valued and the assumptions all line up with what the return needs, so your accountant is not left reconciling a report that answers a slightly different question.
The valuer fixes the date, reconstructs the property's condition and configuration as at that date from title, council and photographic records, then analyses sales that settled around that date and adjusts them for differences. The report states the method, the evidence and the reasoning so the figure can be followed by a third party.
Yes. The ATO's guidance expressly contemplates retrospective assessments and asks that a report identify itself as one. What matters is that the valuation is objective, uses evidence from the relevant period, documents its method and reasoning, and is prepared by a qualified independent valuer.
There is no legal limit, only an evidence limit. Dates within the past 25 years are routine in urban markets, and earlier dates including 20 September 1985 are achievable wherever historical sales records survive. If a date is difficult, we will tell you before you commit.
Residential reports are $297 inc. GST and commercial reports are $594 inc. GST, the same fee as a current-date valuation, delivered in 24 to 48 hours. The fee is fixed and quoted upfront.
Yes. A retrospective valuation values the property as it existed at the valuation date, not as it stands now, so later demolition, renovation or subdivision does not prevent the report. The condition at the date is reconstructed from title and council records, historical listings and any photographs you can supply.
Yes. A backdated valuation, formally called a retrospective valuation, assesses what the property was worth at the earlier date using comparable sales evidence from that time, not today's value adjusted backwards. The report states the effective date and is signed by a Certified Property Valuer.
Any past date, Australia-wide, delivered in 24 to 48 hours. Tell us the address and the date and we will confirm the fee before we start.
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