Quick answer
Selling or gifting property to a relative below market value does not reduce the CGT. The market value substitution rule replaces the actual consideration with the property's market value at the date of transfer, so the tax is calculated on real value regardless of what changed hands. An independent valuation at the transfer date is what substantiates it.
The market value substitution rule
Section 116-30 of the ITAA 1997 replaces the actual capital proceeds with the market value of the asset where no proceeds were received, or where the parties did not deal with each other at arm’s length. A transfer between parent and child, between siblings, or into a family trust or company is ordinarily not at arm’s length.
The rule cuts both ways, which is the part people miss. The transferor is treated as having received market value, so their capital gain is calculated on a figure they never actually got. The transferee is treated as having paid market value, so that becomes their cost base for the future. One valuation establishes both positions.
What follows from the transfer
A below-market family transfer typically triggers several obligations at once, and only the first is a CGT matter.
Obligations arising on a below-market family transfer
What can still reduce the gain
Market value substitution decides the proceeds figure. It does not override the exemptions. If the property was the transferor’s main residence for the whole ownership period, the gain may still be fully exempt, and no CGT arises even though a market value has been substituted.
There is also a genuine rollover for transfers between spouses on the breakdown of a marriage or de facto relationship under Subdivision 126-A, which defers the CGT rather than triggering it. Ordinary family generosity does not qualify — there is no general rollover for gifting property to children.
- Main residence exemption may still apply and may eliminate the gain entirely.
- Marriage or de facto breakdown transfers can roll over under Subdiv 126-A.
- Pre-CGT status, if the property was acquired before 20 September 1985.
- The 50% CGT discount, where the asset has been held at least 12 months by an individual or trust.
- A valuation is still worth obtaining even where an exemption applies — it fixes the transferee’s cost base.
What the valuation needs to be
Because the whole point of the exercise is that the stated price is not evidence of value, the ATO will not accept the parties’ own figure — and a family transfer is precisely the circumstance in which an agent appraisal is least likely to be accepted. This needs an independent valuation by a Certified Practising Valuer, effective the date of the transfer, with a full comparable sales schedule.
Obtain it at or near the transfer date rather than afterwards. Both parties can rely on the same report, and having it on file means the transferee has their cost base documented decades before they need it.
Questions we are asked about this
Can I sell my house to my child for $1?
You can transfer it for any figure you like, but for CGT purposes s116-30 substitutes the market value, so your capital gain is calculated as if you had received full value. Transfer duty is also generally assessed on market value.
Is there CGT if I gift a property rather than sell it?
Yes. A gift is a CGT event and market value is substituted for the absent proceeds. The main residence exemption or pre-CGT status may still reduce or eliminate the gain.
Do we need one valuation or two?
One. The same report establishes the transferor’s deemed proceeds and the transferee’s cost base, and both parties’ accountants can rely on it.
What about transferring property in a divorce?
Transfers between spouses on the breakdown of a marriage or de facto relationship can qualify for rollover relief under Subdivision 126-A, which defers rather than triggers CGT. A valuation is usually still needed for the property settlement itself.
Keep reading
Sources
- Income Tax Assessment Act 1997 — Consolidated Act, AustLII
- Market valuation for tax purposes — Australian Taxation Office — the eight valuation fundamentals
- Australian Property Institute — Professional Practice Standards and the CPV designation
This page is general information about how valuations are used for tax purposes. It is not tax advice. Your accountant or tax agent should confirm which provision applies to your circumstances.
Written and reviewed by
Jarrad Khoury
Head of Valuations at Asset Valuations Group, where he leads the Business Valuation Services division. Over 10 years in property and business valuation. Registered Valuer in Queensland (Not Limited), Licensed Valuer in Western Australia (Not Limited), CPV through the Australian Property Institute (Not Limited), CPV and CBV through the Australian Valuers Institute, and Registered Business Valuer through the AIBB.
Last reviewed 15 September 2026 · About the practice · Editorial policy