Do You Need an Expert Witness Valuation for ATO Deceased Estate and CGT Disputes?

Say the executor of an estate has put $1.2 million on the family home at the date of death. The ATO thinks it was closer to $1 million. That $200,000 gap flows straight into the capital gain, and now someone has to prove which number is right.

That’s the point where many solicitors, executors and accountants start asking whether a standard retrospective valuation is enough, or whether they need valuation evidence for legal disputes that is prepared to stand up to tribunal or court scrutiny. This article explains how the two differ, when each makes sense, and what to organise before you instruct a valuer.

Summary

• Selling a deceased estate property doesn’t usually trigger tax when someone dies. Capital gains tax (CGT) generally arises when the estate or a beneficiary sells.
• For many inherited properties, the market value at the date of death sets the cost base, so that valuation drives the tax result.
• A standard retrospective valuation from a qualified valuer is often enough where nobody disputes the figure.
• An expert witness valuation is written for a tribunal or court. It’s worth considering once the ATO challenges the value, or when the matter is heading to objection, review or litigation.
• The valuation date, the evidence behind it and the valuer’s independence are what usually decide whether the number holds up.
• Rules, time limits and the CGT regime are changing. Confirm the current position with a tax adviser or solicitor.

What Is an Expert Witness Valuation, and How Is It Different From a Standard Valuation?

Both start the same way: a valuer works out what a property was worth on a specific past date. The difference is who the report is written for.

A standard retrospective valuation

This is usually prepared for an executor, accountant or tax agent to set a cost base and support a tax return. It needs to be reasoned and evidence-based, but it’s written for a cooperative audience.

An expert witness valuation

This is prepared for a decision-maker such as the Administrative Review Tribunal or a court. For an ART proceeding, the valuer’s overriding duty is to the tribunal rather than to the party paying for the report, and the expert must provide impartial assistance rather than act as an advocate. The report has to set out the instructions received, the facts and assumptions relied on, the methodology, the comparable sales and the valuer’s qualifications. It also needs to survive cross-examination.

Courts such as the Federal Court expect experts to follow a formal code of conduct, so an expert witness report is structured quite differently from a tax-compliance valuation.

How CGT Reaches a Deceased Estate

You’re generally not taxed on inheriting a property. CGT usually comes into play when the estate or beneficiary later sells. 

Two features of the rules make valuation central:

1. The date-of-death value sets the cost base in some cases. The acquisition cost is the market value at the date of death if the deceased acquired the dwelling before 20 September 1985, or if it passed to you after 20 August 1996 and was the deceased’s main residence immediately before death and not producing income. For other post-CGT property, beneficiaries generally take over the deceased’s original cost base instead. 
2. The main residence exemption depends on timing. If the interest is disposed of within two years of death (meaning settlement occurs within that period), the exemption can apply whether or not anyone lived in the home or earned income from it in that time. The ATO notes an extension period may also be available. 

If the home is held longer or rented out, the exemption can become partial, and the date-of-death value then determines how much of the gain is taxable. That’s why a few hundred thousand dollars in valuation difference can matter so much.

Where Valuation Disputes With the ATO Usually Start

The ATO doesn’t automatically accept every valuation put to it. Common pressure points include: 

• Comparable sales that don’t fit. Sales from a different area or market segment can undermine a valuation. 
• Sales after the valuation date. The ATO expects the valuer to explain why using post-valuation-date or remote-area sales is reasonable. 
• Unsupported assumptions. Where assumptions and conclusions aren’t sustainable on the evidence, the ATO may not treat the report as a complying professional valuation. 
• The wrong date or the wrong condition. A property’s condition at the date of death can differ from today’s, especially if it was renovated, left vacant or neglected afterwards.
• No inspection of the property as it was. Retrospective valuations often rely on photos, listings, council records and agent notes, so the evidence trail matters.

When You Probably Don’t Need an Expert Witness Valuation

Not every estate needs one. For tax purposes, whether a valuation is acceptable usually depends on the process behind it rather than who produced it, though some provisions, like the GST margin scheme, require a professional valuer.

The ATO has said taxpayers who rely on a qualified valuer, and who give accurate information, are generally not liable for penalties if the valuation later proves deficient. 

So if there’s no dispute and the number is well reasoned, a standard retrospective valuation from a qualified valuer is usually the practical option. Online estimates are a poor substitute. Automated valuation models involve no valuer at all. 

When an Expert Witness Valuation Is Worth Considering

Consider instructing one when:

• The ATO has issued an amended assessment or audit findings that dispute your date-of-death value.
• You’re lodging, or have lodged, an objection and the valuation is the main issue.
• The matter may go to the Administrative Review Tribunal or the Federal Court.
• Beneficiaries disagree about value, and the figure affects both the distribution and the tax outcome.
• The property is high value or unusual (rural, mixed-use, heritage or development-potential land) and reasonable valuers could differ.
• Your existing valuation has been criticised and needs an independent review.

An expert witness valuation also isn’t only for the courtroom. A clear, independent report at the objection stage sometimes helps resolve a dispute before it escalates.

How a CGT Valuation Dispute Usually Progresses

The exact path depends on the facts, but it commonly runs like this:

1. The ATO reviews or audits the return and questions the valuation.
2. An amended assessment is issued and you lodge an objection.
3. If the objection is disallowed, you can seek review in the Administrative Review Tribunal (which replaced the AAT in October 2024).
4. An appeal on a question of law can go to the Federal Court.

Strict time limits apply at each stage, so get tax and legal advice early. Where value is the dispute, evidence gathered early usually carries more weight than a report commissioned in a rush.

What to Give the Valuer When You Instruct an Expert

If you’re a solicitor or executor, a good brief makes the report stronger. It typically includes:

• The exact valuation date (the date of death) and the property title details
• The ATO’s position, including any valuation or reasoning it has provided
• Any previous valuations, appraisals or contracts of sale
• Evidence of the property’s condition at the date of death, such as photos, inspection notes and building records
• Details of any renovations, damage or changes since death
• Occupancy and rental history
• The specific questions the report must answer

Don’t tell the valuer what number you need. Independence is the point, and the same principle applies to valuation evidence in building defect claims, where a report that looks reverse-engineered is easy to attack. 

Timing, Records and the 1 July 2027 CGT Changes

Request the date-of-death valuation early, while evidence is still easy to find. Agents’ recollections fade, listings come down and properties get renovated.

CGT is also changing. The 2026–27 Federal Budget announced that from 1 July 2027 the 50% CGT discount will be replaced by cost base indexation with a 30% minimum tax, and the asset’s value at 1 July 2027 will be the starting point for the new calculations. Because the legislative status and the way it applies to inherited property are detailed, check the current position with an accountant before relying on it. 

Common Misconceptions

• “An agent’s appraisal is the same as a valuation.” It isn’t. An appraisal is an opinion, not a documented valuation report, and it may not hold up if the ATO challenges it.
• “Instructing an expert witness means we’re going to court.” Not necessarily. Many disputes resolve at objection.
• “The valuer is on our side.” An expert witness’s duty is to the tribunal or court.
• “Any valuation will do if it’s from a valuer.” The reasoning, evidence and valuation date still have to be sound.

FAQs

Does the ATO require a professional valuation for a deceased estate property?

Generally there’s no single rule. Acceptability usually depends on the quality of the process, although some situations do require a professional valuer.

How do you value a house as at the date of death?

A valuer works backwards to that date using comparable sales, the property’s condition at that time, and any available records. It’s called a retrospective valuation.

Can I use a real estate agent’s appraisal for CGT purposes?

Sometimes, for straightforward matters. If the value could be challenged or is material to the tax outcome, a formal valuation from a qualified valuer is the safer option.

What if the ATO disagrees with my valuation?

You can respond with further evidence or an independent valuation, and lodge an objection to an amended assessment within the applicable time limits.

How long do I have to sell an inherited home to avoid CGT?

Broadly, two years from the date of death, provided the conditions are met. An extension may be available, so speak to a tax adviser.

Is an expert witness valuation the same as a court valuation?

Essentially yes. It’s a valuation report prepared to the standard a tribunal or court expects from an independent expert.

Conclusion

An expert witness valuation isn’t needed for every inherited property. A properly reasoned date-of-death valuation from a qualified valuer is often enough. But once the ATO challenges the number, or a tribunal or court is on the horizon, evidence written for that setting matters. Get the valuation date right, keep your records, and bring in the right advice early.

Need independent valuation evidence? If you’re a solicitor or legal professional working on a deceased estate or CGT matter that’s heading into a tribunal or court, Bail Valuations can talk through the property, the valuation date and what your instructions need to cover. Call Bail Valuations on +61 438 080 786.