Unlock the secrets to Investment Property Timing

The window for using negative gearing against surgical income has closed for new purchases, and the debt-to-income cap now limits how much you can borrow regardless of serviceability.

If you are an oral surgeon planning to add a rental property, timing now determines whether you can deduct holding costs against your clinical income, how much deposit you need, and whether the lender will assess your application under the old or new DTI framework. The legislation that took effect from 1 July 2027 quarantines rental losses on most residential properties purchased after 12 May 2026, and the 20 per cent DTI limit introduced in February 2026 has tightened approval thresholds for high-income borrowers carrying existing debt. Both measures are permanent and both directly affect oral surgeons, who typically earn above the DTI threshold and rely on negative gearing to offset the holding period before a property becomes cash-neutral.

Grandfathered Properties Still Allow Full Negative Gearing

Properties held at 7:30pm AEST on 12 May 2026, including those under contract awaiting settlement at that time, retain the existing negative gearing rules until sold. Where property expenses exceed rental income, the net rental loss can be deducted against other assessable income including salary and wages.

Consider an oral surgeon who exchanged contracts in April 2026 on a two-bedroom unit near a metropolitan hospital precinct and settled in June 2026. Rental income is $28,000 per year, interest on the loan is $38,000, and other deductible expenses add another $6,000. The net loss of $16,000 can be deducted against the surgeon's taxable income each year until the property is sold. At a marginal rate of 47 per cent including Medicare Levy, that loss reduces annual tax by around $7,500, which partly funds the shortfall between rent and holding costs. The grandfathering provision protects that treatment indefinitely for properties already owned.

New Purchases Face Quarantined Losses from 1 July 2027

From 1 July 2027, net rental losses from residential dwellings acquired on or after 7:30pm AEST on 12 May 2026 are quarantined and can only be offset against other residential rental income, or carried forward to offset future residential rental income or future residential property capital gains. Losses cannot be offset against salary, wages or other non-residential income.

An oral surgeon purchasing a rental property in August 2027 with the same income and expense profile as the earlier example would not be able to deduct the $16,000 annual loss against clinical earnings. The loss can be carried forward and used to offset future rental profits from any residential property in the portfolio, or added to the cost base to reduce capital gains tax when the property is eventually sold. The immediate tax relief that made holding costs affordable during the early years disappears, and the full cash shortfall must be funded from after-tax income or other sources.

Eligible New Builds Retain Access to Negative Gearing

Eligible new builds include dwellings constructed on previously vacant land and dwellings replacing existing properties where the number of dwellings increases. Knock-down rebuilds that do not increase dwelling numbers, and substantial renovations, are not eligible. A new build occupied for more than 12 months before sale to a subsequent investor loses access to negative gearing for that subsequent purchaser.

The exemption favours dual-occupancy developments, townhouse subdivisions, and house-and-land packages on greenfield sites. It does not cover off-the-plan apartments in established buildings unless the project demonstrably increases the total dwelling count on the land parcel. An oral surgeon acquiring a brand-new duplex in a growth corridor where one house previously stood retains full negative gearing treatment because the transaction increases housing supply. The same surgeon purchasing a renovated character home, even if extensively rebuilt, does not, because the dwelling count remains unchanged. If you are considering buying your first investment property, the distinction between eligible and ineligible stock now carries a direct and ongoing tax consequence.

Debt-to-Income Caps Apply Separately to Investor and Owner-Occupier Lending

From 1 February 2026, each ADI may fund no more than 20 per cent of new investor loans and no more than 20 per cent of new owner-occupier loans at a DTI of 6 times or greater, with the caps applying separately to each ADI's investor and owner-occupier portfolios and to new lending only. Existing borrowers are not affected.

An oral surgeon earning $400,000 per year can borrow up to $2.4 million before hitting the DTI threshold on a single application, but that ceiling includes all new and existing debt serviced by that income. Where the surgeon already carries a $900,000 owner-occupier mortgage, an investment loan above $1.5 million will exceed the 6 times cap and consume part of the lender's restricted allocation. Lenders manage the cap by prioritising applications within policy, applying stricter income verification, or declining loans that would otherwise meet serviceability.

LVR and Deposit Requirements Interact with the DTI Limit

Most lenders require at least 80 per cent LVR to avoid lenders mortgage insurance on investor loans, meaning a 20 per cent deposit plus settlement costs. At higher LVRs, the premium is calculated on a sliding scale based on the loan amount and LVR, and capitalising the premium into the loan increases both the loan amount and the DTI ratio.

An oral surgeon purchasing a $750,000 rental property with a 10 per cent deposit borrows $675,000 plus around $18,000 in LMI premium, bringing the total loan to $693,000. If existing debt is $900,000 and income is $400,000, the combined DTI is 3.98. The application sits comfortably within the cap. The same surgeon attempting to purchase a $1.2 million property with 10 per cent deposit would borrow around $1.11 million after LMI, pushing combined DTI to 5.03. The second scenario remains within the cap but leaves less headroom for future borrowing. Oral surgeons planning to expand a property portfolio over several years should model cumulative DTI impact before committing to a first or second purchase.

Rental Income Assessment Has Tightened Under Serviceability Rules

Lenders apply a discounted rental income figure when assessing serviceability on investor loans, typically between 70 and 80 per cent of the market rent to account for vacancy, maintenance and management costs. APRA requires ADIs to assess a new borrower's capacity to service a residential mortgage at an interest rate at least 3 percentage points above the loan product rate. The buffer was maintained at 3 percentage points in May 2026 and applies to rental income calculations as well as the applicant's other commitments.

An oral surgeon with $400,000 annual income, $900,000 existing mortgage and $50,000 in other commitments applies for a $700,000 investor loan on a property generating $32,000 annual rent. The lender assesses rental income at 75 per cent, or $24,000, and applies the 3 percentage point buffer to both loans. If the product rate is 6.3 per cent, the assessment rate is 9.3 per cent. The existing mortgage requires $83,700 annual serviceability capacity, the new investor loan requires $65,100, and other commitments take $50,000, for a total of $198,800. After tax, $400,000 income supports the commitment, but the margin is narrower than it would have been under the pre-2021 buffer. Oral surgeons returning from periods of reduced clinical activity or carrying recent practice acquisition debt may find the combination of DTI cap and serviceability buffer constrains borrowing capacity more than expected.

Capital Gains Treatment Changes from 1 July 2027

From 1 July 2027, the 50 per cent CGT discount for individuals, trusts and partnerships is replaced for affected assets with cost base indexation using the Consumer Price Index and a minimum 30 per cent tax rate on real capital gains. Assets owned before 1 July 2027 and sold after that date are taxed under the existing rules for the portion of the gain accruing before 1 July 2027 and under the new rules for the portion accruing after that date.

An oral surgeon who purchased an established rental property in 2026 for $650,000 and sells it in 2032 for $950,000 will apportion the $300,000 gain between the pre-1 July 2027 period and the post-1 July 2027 period. The earlier portion receives the 50 per cent discount, the later portion is indexed and taxed at a minimum 30 per cent. Taxpayers may either obtain a market valuation as at 1 July 2027 or apply an ATO-published apportionment formula. The change does not prevent capital growth, but it does alter the after-tax return and should be factored into hold period and disposal planning.

Interest-Only Loans Remain Available but Attract Higher Risk Weights

Investor loans and interest-only loans generally attract higher risk weights than owner-occupied principal-and-interest loans at the same LVR. Lenders price that risk into the product rate, typically adding 20 to 40 basis points for investor classification and another 20 to 60 basis points for interest-only terms.

Oral surgeons often prefer interest only loans during the quarantined-loss period because the lower repayment preserves cash flow while the tax benefit is unavailable. A principal-and-interest loan on $700,000 at 6.5 per cent requires around $4,400 per month in repayments. An interest-only loan at 6.8 per cent requires $3,970. The monthly saving of $430 can be redirected to other debt, offset accounts on the owner-occupier loan, or practice reinvestment. Once rental income rises or the property moves into positive cash flow, switching to principal-and-interest becomes more viable.

Policy Exceptions Apply to New Dwelling Construction and Affordable Housing

Loans excluded from the cap are finance for the construction of new dwellings, finance for the purchase of newly erected dwellings, and bridging finance for owner-occupiers transferring their principal place of residence within 12 months. Further exemptions apply to private investors supporting government housing programs and qualifying affordable housing.

An oral surgeon financing a house and land package or a dual-occupancy development that will be rented on completion benefits from the DTI cap exemption and retains negative gearing if the build qualifies under the eligible new dwelling rules. The combination makes new construction finance more accessible and more tax-effective than purchasing established stock, particularly where the surgeon's existing debt sits close to the 6 times threshold. The trade-off is construction risk, settlement timing and the holding cost during the build phase, which must be managed separately.

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