Does Joint Ownership Affect My Capital Gains Tax Liability in Australia?
Yes. Each co-owner is assessed on their own share of a capital gain, set by their legal ownership interest on the title — not who paid or who lives there.
Does joint ownership affect my Capital Gains Tax liability in Australia?
Yes. When you own a property jointly with someone else, each of you is assessed for capital gains tax (CGT) individually — not as a couple, a partnership, or a single combined taxpayer. Your capital gain or loss is worked out “in accordance with your ownership interest in the property,” in the ATO’s own words: whatever percentage of the property you legally hold on the title is the percentage of the total gain you personally return.
That share is fixed by the legal ownership interest recorded on the title, not by who paid the deposit, who covered the mortgage repayments, or who actually lived in the property. Two people can hold a title 50/50 even if one of them contributed 80% of the purchase price; unless the ownership percentages on the title are adjusted to reflect that, each co-owner still returns half the gain.
Your share of the gain = your legal ownership interest × the total capital gain
Everything below this point is a variation on that single formula.
How is a capital gain divided between co-owners?
Work out the total capital gain the normal way — capital proceeds (broadly, what you receive for the property) minus cost base (broadly, what it cost you to buy, plus certain related expenses) — then split it according to each owner’s recorded interest. A few common splits look like this:
| Ownership share on title | Share of the gain assessed |
|---|---|
| 50% / 50% | Each owner returns 50% |
| 60% / 40% | Owners return 60% and 40% |
| Three owners, one-third each | Each returns one-third |
Each co-owner then applies their own marginal tax rate, their own eligibility for the CGT discount, and their own capital losses to their share. One co-owner’s tax position — their income for the year, their other capital losses, their residency status — has no bearing on another co-owner’s calculation. They are entirely separate returns built from the same underlying sale.
Does it matter whether we’re joint tenants or tenants in common?
Both start from the same place: a capital gain or loss worked out against your ownership interest in the property. Where they differ is how that interest is defined, and what happens to it when a co-owner dies.
Tenants in common each separately own a stated percentage of the property, and those percentages can be unequal (say, 70/30) — that recorded percentage is your CGT share. A tenant in common can sell, mortgage or lease their own share without the other owners’ agreement.
Joint tenants work differently. While all owners are alive, no one holds a separate, identifiable percentage under the general law of joint tenancy — but for CGT purposes specifically, the law fills that gap with its own rule. Under section 108-7 of the Income Tax Assessment Act 1997, joint tenants are “treated as if they each owned a separate CGT asset constituted by an equal interest in the asset and as if each of them held that interest as a tenant in common.”
In practice, two joint tenants are each treated as owning 50% for CGT purposes; four joint tenants, 25% each — always equal, regardless of who contributed what to the purchase. That equal-shares treatment applies from the outset, so a joint tenancy doesn’t need to be formally severed to fix each owner’s CGT share.
The two structures also diverge on death. If a tenant in common dies, their share becomes an asset of their deceased estate — there’s no automatic transfer to the other owners. If a joint tenant dies, the surviving joint tenant(s) take the deceased’s interest immediately by right of survivorship, and it never becomes part of the deceased’s estate. But for CGT purposes only, section 118-197 of the same Act treats that acquired interest as if it had passed to the surviving joint tenant(s) as a beneficiary of a deceased estate, in equal shares — which can flow through to things like the main residence exemption on the newly acquired interest, in much the same way it would for an inherited interest.
Which structure suits a particular purchase, and how either one plays out for your own circumstances, is worth raising directly with a conveyancer and a registered tax agent before settling on one.
Does the 50% CGT discount apply to each owner separately?
Yes — the discount is assessed per owner, against their own share of the gain, using their own holding period. As at July 2026, the settings are:
| Owner type | CGT discount |
|---|---|
| Individual (Australian resident) | 50%, held 12+ months |
| Trust | 50%, same 12-month test |
| Company | No discount |
| Complying super fund | 33.33% |
The 12-month test excludes both the day the property was acquired and the day of the CGT event (usually, the contract date of sale), and it runs separately for each co-owner from the date their ownership interest began. If one co-owner has held their share for 14 months and another bought in later and has held theirs for 10 months, only the first is eligible for the discount on their portion of the gain — the second pays tax on their full share. Foreign or temporary resident co-owners face additional restrictions on the discount from 8 May 2012, so a mixed-residency ownership group can have different discount outcomes across the same sale.
Tax outcomes depend on your circumstances — speak with a registered tax agent before acting.
What happens if only one co-owner sells their share?
A co-owner can generally dispose of their ownership interest independently of the others — selling their share to an outside buyer, to a co-owner, or transferring it to someone else. CGT applies only to the interest actually disposed of; the remaining co-owners keep their shares and are not taxed on a sale they weren’t part of.
Where the transfer isn’t at arm’s length — most relevantly, a transfer between family members — the market value substitution rule in section 116-30 of the Income Tax Assessment Act 1997 generally applies: your capital proceeds are replaced with the market value of the interest at the time of the transfer, regardless of what changed hands or what price (if any) was agreed. Transferring or gifting a share to a spouse or de facto partner outside of a relationship breakdown is a CGT event like any other disposal, and that same market value substitution rule applies if the transfer isn’t at arm’s length or nothing is paid for it.
The ATO recognises two exceptions to the market value substitution rule: a transfer to the trustee of a special disability trust for no payment (any capital gain or loss can be disregarded), and — more relevant to most co-owners — a transfer to a former spouse on the breakdown of a marriage or relationship, where the rule may not apply.
That relationship-breakdown position connects to a separate rollover under Subdivision 126-A of the Act. It applies only where the transfer happens because of a qualifying court order or formal agreement — for example, a Family Law Act 1975 court order, a court-approved maintenance agreement, a binding financial agreement, or a written agreement binding under a relevant state, territory or foreign law — and only where the spouses are separated with no reasonable likelihood of resuming cohabitation. Informal or private family arrangements don’t qualify.
Where the rollover does apply, using it isn’t optional: the transferor’s capital gain or loss on the transfer is disregarded, and the person who receives the share is treated as having owned it since their former partner acquired it, so CGT is deferred until they themselves eventually dispose of it. One limit worth knowing: if the co-owners already jointly owned the property before the relationship breakdown, that pre-existing share doesn’t get rollover treatment — it simply continues to be owned, with its own history, alongside whatever new share is transferred under the rollover.
Whether a particular transfer meets the qualifying-agreement test, and what it means for each person’s eventual CGT position, turns on the exact instrument used and the individual circumstances involved — a registered tax agent and a family lawyer are the right people to confirm this against, rather than general guidance like this article.
Does this apply if I hold Brix in a property alongside other investors?
Not in the same way, and it’s worth being precise about why. The ATO’s co-ownership rule addresses people who hold a legal or equitable ownership interest in a property — tenants in common, joint tenants, or a similar title-based structure. Under the MyBrix Product Disclosure Statement, a Brix is a fractional economic interest in a property’s future net sale proceeds (and, where applicable, net rental proceeds) — a financial product under the Corporations Act, not an ownership interest in the land itself. The property’s owner remains the registered legal owner throughout.
That’s a structurally different arrangement from two people on the same title, which means the ATO’s co-owner apportionment rule isn’t a direct match for how multiple Brix holders in the same property are taxed. No published ATO guidance addresses that fractional-interest structure specifically, so this article doesn’t assert one tax treatment applies. How Brix income and gains are characterised for tax purposes depends on the underlying structure and your own circumstances — the Product Disclosure Statement and a registered tax agent are the places to confirm your position.
What records should each co-owner keep?
The same record-keeping obligation applies to every co-owner individually — each person substantiates their own share of the cost base and their own proceeds. Property CGT records generally need to be kept for the whole period you own your interest, plus at least 5 years after you dispose of it.
Practically, that means every co-owner benefits from holding their own copy of the purchase contract and settlement statement, receipts for any capital improvements they funded, and records of any change in ownership percentages over time, rather than relying on a co-owner’s paperwork to cover their own return. Where ownership percentages have shifted (for example, after a refinance or a partial buyout), keeping a clear paper trail of when and why avoids a dispute over whose share of the gain is whose.
The bottom line for co-owners
Joint ownership doesn’t complicate the CGT formula — it just runs the same formula once per owner, each against their own recorded share, their own holding period, and their own tax position. The number on the title is what decides the split; everything else — the discount, the record-keeping, the timing of a sale — flows from that one figure.
For the full mechanics of the underlying calculation, see our guide to capital gains tax on property in Australia.
