Serviceability assessment determines how much a lender will allow you to borrow based on your ability to meet repayments.
For dentists, this calculation involves more than just your gross income. Lenders apply different treatment to your base salary, associate income, and practice profit depending on your employment structure and documentation. Understanding how each income type is assessed and which adjustments lenders make will help you position your application for the outcome you need.
How Lenders Calculate Serviceability for Dentists
Lenders assess your net income after tax, then subtract your living expenses and existing debt commitments to determine what remains for loan repayments. The loan amount is calculated using a buffer rate that sits above the actual interest rate, typically adding 3% to protect against rate rises.
Consider a dentist earning $180,000 as an associate across two practices. One lender might accept 80% of the gross associate income without requiring tax returns if payslips and bank statements align. Another lender might require two years of tax returns and average the declared income, which could produce a lower assessable figure if you claimed significant work-related deductions. The difference in approach can shift your borrowing capacity by $100,000 or more between lenders.
The buffer rate compounds this variation. A lender assessing your repayment capacity at the actual variable rate plus 3% will approve a higher loan amount than one using a floor rate of 7% regardless of the current market rate. These structural differences between lenders make serviceability outcomes highly variable for the same income.
Income Treatment for Practice Owners
Practice owners face additional layers of assessment because lenders must verify both personal income and business stability.
Most lenders require two years of tax returns showing consistent or increasing profit before they will assess practice income at full value. If you have recently acquired or established a practice, some lenders will accept 12 months of financials combined with a strong profit and loss statement, particularly if you have a history in the profession and the purchase was structured with external advice. In our experience, the way you structure drawings versus retained profit has a direct impact on assessable income, and this varies between lenders.
A dentist who has owned a practice for 18 months and shows $220,000 in net profit on the most recent financial year may be assessed at that figure by one lender but averaged down with the prior year's lower result by another. If the prior year showed $140,000 because the practice was only owned for part of that period, the averaged figure drops to $180,000. Choosing a lender that applies weighting to the most recent year or accepts a shorter trading history can recover that $40,000 gap in assessable income.
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Declared Income Versus Actual Cash Flow
Your taxable income and your actual cash flow are rarely the same figure, and lenders know this.
Depreciation, vehicle expenses, and other non-cash deductions reduce your taxable income but do not affect your capacity to service a loan. Most lenders will add back depreciation when calculating serviceability for self-employed borrowers. Some will also add back certain other deductions if you can demonstrate they do not reflect actual outgoings. However, this add-back process is not automatic and requires clear documentation.
A periodontist with $160,000 in taxable income after claiming $25,000 in depreciation and $15,000 in vehicle expenses may have an assessable income of $185,000 with one lender if depreciation is added back, but remain at $160,000 with another that does not apply add-backs without a full accountant's letter. The difference directly affects how much you can borrow and whether you need to provide a larger deposit to meet the lender's loan-to-value ratio requirements.
How Existing Debts Reduce Your Capacity
Every ongoing debt commitment reduces the income available for your home loan repayment, and some debts have a disproportionate impact.
Credit cards are assessed on their limit, not the balance. A card with a $30,000 limit reduces your serviceability by the same amount whether you owe $500 or $29,000. Lenders assume you could draw the full limit at any time. Personal loans, car loans, and investment property commitments are factored in at their actual repayment amount, with investment properties assessed on rental income net of a vacancy and management allowance.
If you are carrying HECS debt, lenders apply a percentage reduction to your net income based on the outstanding balance and your income threshold. For a dentist earning above the maximum repayment threshold, this typically removes around 2% to 3% of your assessable income. Paying down your HECS balance before applying for a home loan pre-approval will recover some serviceability, but closing or reducing credit card limits often produces a larger and faster improvement.
Living Expenses and the Household Expenditure Measure
Lenders no longer accept your declared living expenses at face value.
The Household Expenditure Measure (HEM) sets a minimum living expense benchmark based on your income, family size, and location. If your actual expenses shown in bank statements are lower than HEM, the lender will use the higher HEM figure. If your actual expenses are higher, the lender will use the actual figure. This means understating your living costs has no effect on the assessment.
A dual-income household with two young children and a combined income of $250,000 will typically face a HEM floor of around $3,500 to $4,000 per month depending on location. If your bank statements show $6,000 in monthly outgoings due to childcare, school fees, or other regular costs, the lender will assess you at $6,000. Reducing discretionary spending in the three months before you apply can lower this figure, but fixed commitments like school fees and childcare cannot be ignored.
Rental Income and Investment Property Considerations
If you already own an investment property, lenders will include the rental income in your serviceability calculation but apply a reduction to account for vacancies and management costs.
Most lenders assess rental income at 80%, meaning $600 per week in rent becomes $480 per week of assessable income. The loan repayment on the investment property is then deducted in full. If the property is neutrally geared or negatively geared, the shortfall reduces your capacity to borrow for the next purchase. If it is positively geared, the surplus can improve your position, though this is uncommon for recent purchases.
Some lenders allow you to refinance an existing investment loan to interest-only repayments before applying for a new owner occupied home loan, which reduces the outgoing on the investment property and frees up serviceability for the new loan. This approach works particularly well if you are moving from a principal and interest loan to interest-only on a property you intend to hold long-term.
Why Your Application Might Be Declined Despite Strong Income
Serviceability failures often surprise applicants who assume their income alone determines the outcome.
A declined application typically reflects one of three issues: undeclared liabilities that emerge during verification, living expenses that exceed the lender's threshold, or insufficient net income after all adjustments are applied. In some cases, the loan amount is approved but the lender's loan-to-value ratio policy requires a larger deposit than the applicant has available, particularly if Lenders Mortgage Insurance cannot be applied.
We regularly see applications declined by one lender and approved by another without any change to the applicant's financial position. The difference lies in how each lender applies their assessment policy to your specific income structure and debt profile. This is why working with a broker who understands which lenders suit your scenario matters more than simply comparing interest rates.
Structuring Your Application to Strengthen Serviceability
You can influence the outcome by preparing your financial position before you apply.
Close unused credit cards and reduce limits on any cards you retain to the lowest amount you need. Pay down personal loans or car loans where possible, or consider consolidating high-interest debts into a lower-rate structure if it reduces your total monthly commitment. If you have irregular income from locum work or additional associate days, ensure this income is documented consistently across payslips, bank statements, and tax returns for at least the past 12 months.
If you are transitioning from associate to practice owner or have recently increased your ownership share, speak with your accountant about how your income will be reported in the current and next financial year. A proactive conversation with a broker before you lodge your tax return can help you structure your declared income in a way that satisfies both the ATO and future lenders without compromising either position.
Call one of our team or book an appointment at a time that works for you. We will assess your income structure, identify which lenders are most likely to approve your scenario, and position your application to maximise your borrowing capacity without unnecessary delays.
Frequently Asked Questions
How do lenders assess serviceability for dentists?
Lenders calculate your net income after tax, subtract living expenses and existing debts, then determine repayment capacity using a buffer rate typically 3% above the actual interest rate. Income treatment varies depending on whether you are salaried, an associate, or a practice owner, with some lenders accepting payslips while others require tax returns.
Why does my taxable income differ from my assessable income?
Taxable income includes deductions like depreciation and vehicle expenses that reduce your tax but do not reflect actual cash outflow. Most lenders add back depreciation when assessing serviceability for self-employed dentists, which can increase your assessable income and borrowing capacity.
How do credit cards affect my borrowing capacity?
Credit cards are assessed on their limit, not the balance. A card with a $30,000 limit reduces your serviceability by the same amount regardless of what you owe. Closing unused cards or reducing limits before applying can significantly improve your borrowing capacity.
What is the Household Expenditure Measure?
The Household Expenditure Measure (HEM) is a minimum living expense benchmark based on your income, family size, and location. If your actual expenses are lower than HEM, lenders use the higher HEM figure, meaning understating expenses has no effect on your assessment.
Can I improve my serviceability before applying?
Yes. Close unused credit cards, reduce card limits, pay down personal loans, and ensure irregular income is documented consistently for at least 12 months. If you are self-employed, speak with your accountant about structuring your declared income to satisfy both the ATO and lenders.
