The 'Residential Income Only' Rule: How Rental Losses Work for New Investment Properties

From 1 July 2027, losses on newly acquired established residential investment property can only be deducted against residential property income. The "residential income only" rule creates a quarantined deduction category separate from wages, business profits, share dividends, interest, and commercial property income. This article explains exactly what counts as residential property income, how the carry-forward register tracks unused losses, and the ATO compliance implications investors should be planning for.

The rule in full

For losses arising on or after 1 July 2027 from established residential investment property acquired on or after that date:

• The loss does not reduce the investor's other assessable income in the year of arising
• It is added to the investor's "residential property loss" carry-forward register
• It can only offset future residential property income, defined narrowly (below)
• Unused losses carry forward indefinitely until used or extinguished on death

What counts as "residential property income"

The legislation defines residential property income to include:

• Rent received from residential investment property (after deductible expenses)
• Capital gains on disposal of residential investment property (after CGT discounting/indexation)
• Insurance proceeds in respect of residential investment property where assessable as income
• Other income directly derived from residential investment property (e.g., parking, storage attached to a residential unit, breaking-lease fees, late payment fees from tenants)

Importantly, the income test pools across an investor's entire portfolio of post-2027 established residential properties. A positive year on Property A absorbs losses from Property B. The total carry-forward register applies at the investor level, not the property level.

What does NOT count

• Salary and wages
• Business income
• Share dividends, interest, managed fund distributions
• Commercial property income (rent, capital gains)
• Short-stay accommodation income operated as a commercial business
• Capital gains on the main residence (which remains exempt anyway)
• Income from new-build residential properties (these losses offset wage income directly)
• Income from grandfathered residential properties (same)

How the carry-forward register works

The ATO maintains a per-investor residential property loss register. Each tax year:

1. Calculate net residential property income across all post-2027 established holdings
2. If net positive: existing carry-forward losses are applied to reduce the figure (in chronological order oldest first)
3. If net negative: the loss is added to the register
4. Any residual positive income (after carry-forward application) is assessable income, taxed at marginal rates
5. Unused carry-forward balance rolls to the next year

The register is personal and non-transferable. Spouses cannot share registers. A jointly- owned property allocates income and losses by ownership percentage, with each owner's share flowing to their personal register.

Interaction with CGT on disposal

On disposal of a residential investment property, the capital gain (after CPI indexation and 30% minimum tax adjustment) is included in residential property income for that year. Accumulated carry-forward losses are applied to reduce the gain.

Example: an investor accumulates $80,000 in carry-forward losses over six years and sells a property with a $250,000 post-indexation capital gain. The gain is reduced by the $80,000 register balance to $170,000, which is then taxed at the investor's marginal rate (with the 30% floor applied if relevant). The register is fully cleared.

ATO compliance and recordkeeping

Investors with affected properties should expect significant compliance changes:

• Annual register reporting: the ATO is expected to require tax-return reconciliation of the residential property loss register, including opening balance, additions, applications and closing balance
• Property classification: investors will need to label each property in their return as grandfathered, transitional, new-build or post-2027 established
• New-build evidence: documentation supporting new-build classification will be required at first claim and retained for audit
• Joint ownership tracking: each owner's portion of income/loss tracked separately
• Property managers: standard PAYG-style summaries may need to flag classification

For investors managing complex portfolios, the new rules likely require structured tax- management software or accountant involvement. The ATO has indicated guidance materials will be released through 2026-27 in preparation for the 1 July 2027 commencement. For practical portfolio guidance, see our pieces on how carry-forward losses work and existing landlord strategy.