We own the investment property together — can the higher earner claim the whole rental loss?

Two names on the certificate of title. One of you earns around $185,000, the other around $62,000. The investment property runs at a loss each year, and the arithmetic is hard to ignore: that loss is worth a great deal more sitting in the higher earner's return than split down the middle. The loan repayments come out of that person's account anyway. Why not just claim it there?

It is one of the most common questions investment property owners ask, and the answer is long settled. It just isn't the answer most people are hoping for.

The title decides it, not the bank account

The ATO's position is that you declare rental income based on your legal ownership of the property — own 50% of a property and you declare 50% of the rent in your return. The deductions follow the same line: where you co-own a rental property, income and expenses are attributed to each co-owner according to their legal interest in the property.

'Legal interest' means what the certificate of title records. If you hold the property as joint tenants, you each hold an equal interest — for two owners that is 50/50, with no room to move. If you hold it as tenants in common, the interests can be unequal, say 20/80 or 30/70, and both the rent and the deductions follow those recorded percentages.

What does not change the split: who pays the mortgage, whose account the rent lands in, who organises the repairs, or what the two of you have agreed between yourselves. Taxation Ruling TR 93/32 is explicit on this — because co-owners of a rental property are generally not partners at general law, an agreement between them, oral or in writing, has no effect on how the income or loss is shared. It must be shared according to legal interest, except in the very limited circumstances where there is sufficient evidence that the equitable interest differs from the legal title.

So the honest answer to the barbecue suggestion is no. If a different split is genuinely wanted, the thing that would have to change is the legal ownership itself — and transferring an interest in a property is a capital gains tax event and usually a stamp duty one too. That is a decision to price out properly before anyone signs anything, not a line to adjust at tax time.

The second trap: net rent is not your rental income

The other error the ATO keeps finding on co-owned properties has nothing to do with the split. Your property manager collects the rent, takes their fee, pays the council rates and a plumber, and transfers the balance. It is natural to treat the amount that arrives in your account as your rental income. It isn't.

You report the gross rent — the full amount the tenant paid, before it is reduced by management fees and any expenses the agent paid on your behalf — and then claim those fees and expenses separately as deductions. Reporting the net figure and also claiming the expenses means the same costs come off twice, which is exactly the pattern data matching is built to spot. Your annual statement from the agent will show both columns; the gross figure is the one that goes in as income.

Timing catches people too. Rent is declared in the year your tenant pays it to your agent, not the year it is transferred on to you — so late-June rent that reaches your account in July belongs in the earlier year. The same applies to bond money kept in place of a final month's rent: it is income in the year the property manager received it.

Why co-owned properties are being cross-checked

None of this is new law. What has changed is how visible it is. Under the ATO's property management data-matching program, data is collected from property management software companies for the 2018–19 to 2025–26 financial years, with records relating to approximately 2.3 million individuals obtained each financial year. Rental bond data from state and territory bond authorities is collected alongside it.

That means the ATO can see a property, the rent collected on it, and how many owners it has — and compare that against what each owner reported. A property where one co-owner declared the rent and the other declared nothing, or where the reported income sits suspiciously close to the net figure on the agent's statement, stands out without anyone having to go looking.

The practical version is short. Check the title, not the loan statement, and split the rent and every deduction on that percentage. Use the gross rent from the agent's annual statement. Make sure each co-owner lodges their share — a property missing entirely from one owner's return is one of the most common mismatches the ATO reports. And if the ownership structure itself looks wrong for your circumstances, that is a conversation to have before you buy the next one, not after.

This is general information current as at July 2026, not advice for your situation — how it applies depends on your title, your loan arrangements and your broader circumstances. If you want to see what a property actually does to your position, our investment property calculator is a reasonable starting point, and our service for property investors is there for the year-end work.