What Is a Retrospective Property Valuation for Capital Gains Tax?

If you need to know what a property was worth at a date in the past, a current market appraisal won't provide the answer.

A retrospective property valuation, sometimes called a historical valuation, determines the market value of a property at a specified date in the past.

These valuations are commonly requested for Capital Gains Tax purposes when an accountant or tax adviser needs an independent assessment of a property's market value at a particular point in time.

Why might a retrospective valuation be needed for CGT?

Capital Gains Tax calculations can sometimes require a property owner to establish the market value of a property at a particular historical date.

Depending on the owner's circumstances, this could arise when a property was inherited, when the use of a property changed, or where a historical market value is otherwise relevant to determining the property's CGT position.

The appropriate valuation date depends on the individual circumstances and applicable tax rules. Your accountant or tax adviser should confirm whether a valuation is required and the date at which the property needs to be valued.

Once that date has been established, a qualified property valuer can determine the property's market value at that point in time.

Property owners should also be aware of the upcoming Capital Gains Tax Changes from 1 July 2027, which may make establishing a property's market value at a relevant date important for some owners.

How can a valuer determine what a property was worth years ago?

A retrospective valuation isn't simply today's property value adjusted backwards.

The valuer researches the property and the market as they existed at the relevant valuation date.

This may include consideration of:

• comparable property sales around the valuation date
• historical market conditions
• the property's location and land characteristics
• the improvements that existed at the time
• the property's size, condition and features
• planning and zoning information where relevant
• available historical records and property information.

The valuer then analyses the available evidence to form an independent opinion of the property's market value at the specified date.

What if the property has been renovated since the valuation date?

This is one reason retrospective valuations can require careful research.

A property may look very different today from how it did at the historical valuation date.

Renovations, extensions, additional structures and other improvements made after the relevant date may need to be identified so that the valuation reflects the property as it existed at that time, rather than its current condition.

Information such as old photographs, building plans, renovation records, previous sales listings or other historical documentation can therefore be useful.

How far back can a retrospective property valuation go?

Historical valuations can potentially relate to dates many years in the past.

The availability and quality of historical evidence can vary depending on the property, location and valuation date, so older valuations may require more extensive research.

A valuer will consider the information and market evidence available for the relevant period when determining whether a reliable retrospective valuation can be completed.

Is a real estate agent's appraisal enough for CGT?

A real estate appraisal and an independent property valuation serve different purposes.

An appraisal provided by a real estate agent is generally an estimate of the property's potential current selling price and is primarily used in connection with selling property.

A formal property valuation is prepared by a qualified valuer and provides an independent assessment of market value supported by valuation methodology and market evidence.

Where a market valuation is required for taxation purposes, property owners should ask their accountant or tax adviser what form of valuation evidence is appropriate for their circumstances.

What information should I provide for a retrospective valuation?

The first things your valuer will generally need are the property address and required valuation date.

Depending on the property and how far back the valuation needs to go, additional information may also assist, including:

• details of renovations or improvements
• approximate dates when works were completed
• historical photographs
• building or floor plans
• previous sales information
• relevant property documents.

Don't worry if you don't have everything. The valuer can advise what information is useful once the property and valuation date are known.

Retrospective CGT valuations in Sydney & surrounding regions

Quantum Valuation provides independent retrospective property valuations for Capital Gains Tax purposes throughout Sydney & Surrounding Regions.

With more than 15 years of valuation experience, Principal Valuer Ryan works directly with property owners, accountants and tax advisers to establish historical market values supported by relevant property and market evidence.

If your accountant has requested a retrospective property valuation, provide us with the property address and required valuation date and we can advise you on the next steps.