Do you know what lenders assess for investment approval?

Lenders assess investment loan applications differently to owner-occupied finance, and medical practitioners often encounter approval challenges despite strong incomes.

The structure of medical income, whether from private practice, hospital employment, or mixed sources, creates complexity during serviceability calculations. Add rental income assumptions, higher debt-to-income scrutiny, and recent policy changes around negative gearing, and the approval process becomes harder to predict. Understanding what lenders prioritise and how your application will be assessed puts you in a stronger position before you apply.

How lenders calculate serviceability for investment property finance

Serviceability measures whether you can afford the loan repayments based on your income, existing debts, and living expenses. For investment loans, lenders apply a higher assessment interest rate than the actual rate you'll pay, often adding a buffer of 2-3% to account for future rate rises. Rental income from the property is typically only counted at 80% of the expected amount to allow for vacancy periods and maintenance costs.

Consider a specialist earning a base salary of $180,000 plus irregular private billings of $60,000 annually. If you're applying for a loan on a property with projected rental income of $600 per week, the lender will assess that income at around $480 per week. Your private billings may be discounted or averaged over two years depending on the lender's policy for variable income. The combination of reduced rental income and conservative income treatment can limit your borrowing capacity even when your actual cash flow is strong.

This is where understanding investment loan products and how different lenders assess medical income becomes critical. Some lenders offer more flexibility for doctors with varied income streams, while others apply strict averages that undervalue your earning potential.

Deposit requirements and Lenders Mortgage Insurance

Most lenders require a minimum 10% deposit for investment property loans, though some will lend at higher loan to value ratios with Lenders Mortgage Insurance. If you're borrowing above 80% of the property's value, LMI applies, and the premium can add thousands to your upfront costs. For medical practitioners, some lenders waive LMI on investment loans up to 90% LVR, though policies vary and often apply only to specific professions or employment types.

If you're using equity from your existing home rather than cash savings, the same LVR thresholds apply. Lenders will assess the combined loan to value ratio across all secured properties. In practice, this means that even if your home has substantial equity, you may still face LMI if the total borrowing pushes the combined LVR above 80%.

Interest rate structures and repayment options

Investment loans are typically priced higher than owner-occupied loans, with interest rates sitting 0.2% to 0.5% above equivalent home loan products. You can choose between variable and fixed rate options, or split your loan between both. Interest only repayments are common for property investment loans, allowing you to reduce monthly repayments and maximise tax deductions while the property appreciates.

An interest only period usually runs for five years, after which the loan reverts to principal and interest unless you renegotiate. This structure works well if your strategy is focused on capital growth and tax efficiency rather than paying down debt quickly. However, lenders assess your serviceability on a principal and interest basis even if you're applying for interest only, so your borrowing capacity may be lower than expected.

If you're considering a refinance of an existing investment loan, switching from principal and interest to interest only, or vice versa, can reshape your cash flow and tax position. The decision depends on your income level, marginal tax rate, and whether you're prioritising debt reduction or portfolio growth.

Policy changes affecting investment loan approval from mid-2027

From 1 July 2027, negative gearing deductions on established residential properties purchased after 12 May 2026 will be restricted. Losses from these properties can only be offset against rental income or capital gains from residential property, not against salary or other income. The change does not affect properties purchased before Budget night, and new builds remain eligible for full negative gearing deductions.

For medical practitioners with high marginal tax rates, this shift reduces the immediate tax benefit of holding a negatively geared property. Lenders are also adjusting their serviceability models to reflect the reduced tax offset, which may tighten borrowing capacity for some applicants. If you're planning to purchase an established property as an investment, the timing of your application and settlement now carries additional weight.

Capital gains tax arrangements are also changing from the same date, with the 50% CGT discount replaced by inflation-based indexation and a minimum 30% tax on gains. New builds will retain the option to use the 50% discount, creating a tax advantage that may influence your property selection. These policy shifts don't prevent approval, but they do change the financial modelling lenders use and the long-term return profile of the investment.

Documentation and income verification for medical professionals

Lenders require recent payslips, tax returns, and financial statements depending on your employment structure. If you're a salaried employee, two recent payslips and a letter of employment are usually sufficient. For those operating through a private practice, partnership, or trust, lenders typically request two years of tax returns, financial statements, and accountant-prepared income declarations.

In our experience, applications from medical practitioners are often delayed by incomplete or inconsistent documentation around private billings, trust distributions, or deductions claimed for practice expenses. If your taxable income has been reduced through legitimate deductions, lenders may add back certain expenses to arrive at a higher assessable income, but this varies by lender and requires clear documentation.

Some lenders also request evidence of rental income if you already hold investment properties, along with current lease agreements and property management statements. If the property you're purchasing is tenanted, a signed lease can support your rental income estimate during the application.

How your existing debt affects investment loan approval

Lenders assess all existing commitments, including credit cards, personal loans, HECS debt, and other mortgages. Credit card limits are treated as if fully drawn, regardless of your actual balance. A $20,000 limit may reduce your borrowing capacity by $40,000 or more depending on the lender's assessment rate.

Consider a GP with an outstanding owner-occupied mortgage of $400,000, a car loan of $25,000, and two credit cards with combined limits of $30,000. Even if the cards are rarely used, the lender assumes monthly repayments based on the full limit. Reducing or cancelling unused credit before applying can materially increase your borrowing capacity without changing your income.

HECS debt is factored into serviceability as a percentage of your income once you exceed the repayment threshold. For high-income earners, this can reduce borrowing capacity by tens of thousands of dollars. There's no requirement to repay HECS before applying, but understanding its impact on your application helps set realistic expectations around how much you can borrow.

Rental income assumptions and vacancy considerations

Lenders typically assess rental income at 80% of the amount stated on a lease or rental appraisal. This buffer accounts for vacancy periods, maintenance, and management fees. If you're purchasing a property that's currently tenanted, the existing lease provides strong evidence of rental income. If the property is vacant or you're buying off the plan, lenders rely on a rental appraisal from a licensed property manager or valuer.

The suburb, property type, and local rental market all influence how lenders assess rental income. A unit in an area with high vacancy rates may be discounted more heavily than a house in a tightly held suburb with strong rental demand. Lenders also consider body corporate fees, council rates, and strata levies when calculating net rental income, so these costs reduce the income available to service the loan.

If you're purchasing in a location with known vacancy issues or oversupply, expect lenders to apply conservative rental income assumptions. This is one reason why property selection and location research matter as much as the loan structure itself when it comes to approval.

Multiple properties and portfolio lending considerations

If you already own one or more investment properties, lenders assess your entire portfolio when you apply for additional finance. Cross-collateralisation, where multiple properties secure a single loan, can simplify the application but limits your flexibility to sell or refinance individual properties later.

Some lenders cap the number of financed properties they'll support, particularly for borrowers with more than four mortgaged properties. Others apply stricter serviceability tests or require larger deposits once you exceed a certain portfolio size. For medical practitioners building a property portfolio, working with a broker who understands investor lending policies across multiple lenders is often the difference between approval and decline.

Portfolio growth strategies that rely on leveraging equity from existing properties also depend on rising property values and stable income. If equity has grown in your home or another investment, you may be able to access that equity to fund your deposit without selling assets. However, lenders still assess the total loan amount and combined LVR, so equity alone doesn't guarantee approval if your serviceability is tight.

Call one of our team or book an appointment at a time that works for you. We'll assess your income structure, review your existing commitments, and identify lenders with policies that support your investment goals.

Frequently Asked Questions