What lenders assess in an investment loan application
Lenders evaluate your capacity to service the loan and whether the property generates sufficient rental income. The assessment includes your taxable income, existing debts, living expenses, and the rental income the property is expected to produce. Most lenders apply a rental income discount of 20 per cent to account for vacancy periods and maintenance costs, meaning they assess only 80 per cent of the expected rent when calculating your serviceability.
A Preston investor purchasing a two-bedroom unit near High Street might expect rental income of $500 per week. The lender would assess serviceability using $400 per week after applying the 20 per cent discount. That $100 weekly buffer accounts for vacancy periods, repairs, and body corporate levies that reduce the net income available to cover loan repayments. Borrowing capacity depends on how your income compares to total commitments once the discounted rental income is added and the new loan repayment is factored in.
APRA's debt-to-income cap, effective from February, limits how many loans a lender can approve at six times gross income or higher. For investor loans, no more than 20 per cent of the lender's new investor lending can exceed that threshold. If your income is $100,000 and your proposed borrowing pushes total debt above $600,000, the lender may need to allocate part of its restricted portfolio to your application or decline it outright.
Investment loan amount and deposit requirements
Most lenders require a minimum 10 per cent genuine savings deposit for residential investment property, though some accept 5 per cent if your income and credit profile are strong. Lenders Mortgage Insurance applies when your deposit is below 20 per cent, and the premium is higher for investor loans than for owner-occupied borrowing. LMI on an investor loan with a 10 per cent deposit can add several thousand dollars to your upfront costs, and not all lenders capitalise the premium into the loan amount for investment purposes.
You can use equity from an existing property to fund the deposit and associated costs. If your Preston home is valued at $800,000 and you owe $300,000, usable equity is typically capped at 80 per cent of the property's value minus the outstanding loan. That provides $340,000 in accessible equity before LMI, enough to fund a deposit and cover stamp duty, conveyancing, and loan establishment fees. Releasing equity does not require you to sell or refinance your entire loan, but it does mean your home secures both the original loan and the new investment borrowing.
Deposit size affects both approval likelihood and the interest rate you receive. A 20 per cent deposit avoids LMI, improves your loan-to-value ratio, and may qualify you for a rate discount. Investors with higher equity contributions represent lower risk to the lender, and that risk assessment flows through to the pricing of your loan.
Rental income and how lenders calculate it
Lenders order a rental assessment as part of the property valuation, and that assessment determines the income figure used in your application. The valuer provides a rental range based on comparable properties in the area, and the lender applies the lower end of that range before discounting it by 20 per cent. You cannot substitute your own rental estimate or use a property manager's appraisal in place of the lender's assessment.
A property near Reservoir might be assessed with a rental range of $480 to $520 per week. The lender uses $480, then discounts it to $384 for serviceability purposes. If your actual rental income is higher once the property is leased, that does not change the lender's assessment at application. The income used to approve the loan remains fixed at the discounted valuation figure, and any shortfall between the assessed rent and the actual loan repayment reduces your borrowing capacity for future applications.
Rental income is treated as assessable income for tax purposes, and lenders are aware that interest, property management fees, council rates, insurance, and depreciation are all claimable expenses. The tax benefit of negative gearing improves your after-tax cash flow, but it does not increase the rental income figure the lender uses to assess serviceability. They calculate repayment capacity before tax deductions are applied.
How negative gearing rules affect your borrowing capacity now
The ability to offset rental losses against other income remains available for properties purchased before 7:30pm AEST on 12 May 2026. For properties purchased after that date, negative gearing is quarantined from 1 July 2027 unless the property qualifies as an eligible new build. Quarantined losses can only offset future rental income or capital gains from residential property, not salary or wage income.
Lenders have not changed their serviceability models in response to the legislation, because serviceability is calculated on gross income and rental income before any tax offsets are applied. The negative gearing benefit affects your after-tax cash flow and investment strategy, but it does not alter the income and expense figures the lender uses to approve the loan. If you are purchasing an established property in Preston now, you will not have access to negative gearing from 1 July 2027 unless the property was under contract before 12 May 2026.
Properties acquired between 12 May 2026 and 30 June 2027 can be negatively geared under existing rules until 30 June 2027, after which losses are quarantined. If you are considering a purchase during this transitional window, the ability to offset losses against your salary for one financial year only is unlikely to change your long-term holding strategy, but it may influence the timing of settlement if that flexibility has material value to your cash flow.
Interest rate structure and investor loan products
Investor interest rates are higher than owner-occupied rates, typically by 20 to 60 basis points depending on the lender and your loan-to-value ratio. Variable rate investment loans offer flexibility to make extra repayments and access features like offset accounts and redraws, while fixed rate products lock in certainty for a set term but usually restrict additional repayments and do not include offset functionality.
Interest-only repayments are common for investment loans because they reduce the monthly commitment and maximise tax-deductible interest. An interest-only period typically lasts five years, after which the loan converts to principal and interest unless you apply to extend the interest-only term. Not all lenders offer interest-only extensions, and approval depends on your serviceability and the loan-to-value ratio at the time of the request.
Some investors split the loan between variable and fixed portions to balance flexibility and rate protection. A split structure allows you to make extra repayments on the variable portion while the fixed portion provides certainty over a known share of the debt. The combination works if you expect variable rates to rise but still want access to offset or redraw features for surplus cash flow.
Documentation and supporting evidence
Lenders require recent payslips, tax returns, and notice of assessment if you are an employee, or two years of financial statements and tax returns if you are self-employed. They also request statements for all bank accounts, credit cards, and existing loans to verify your living expenses and financial commitments. Rental income from existing investment properties must be supported by current lease agreements and rental statements from your property manager.
If you are using equity from an existing property, the lender orders a valuation to confirm the current market value. The valuation determines how much equity is available and whether the property provides sufficient security for the combined borrowing. If the valuation comes in below your expectation, the amount of accessible equity reduces, and you may need to adjust the purchase price or contribute additional cash to meet the deposit requirement.
Your credit history is assessed as part of the application, and any defaults, missed payments, or high credit card utilisation will affect your approval likelihood and the interest rate offered. Lenders also review your existing loan commitments to calculate your debt-to-income ratio and confirm that your total borrowing remains within their risk appetite.
Investment property finance and refinancing options
Refinancing an existing investment loan can reduce your interest rate, release additional equity for further property purchases, or consolidate debt to improve cash flow. If your Preston investment property has increased in value or your outstanding loan balance has reduced, refinancing allows you to access that equity without selling the property. The equity can be used to fund another deposit, complete renovations, or cover other investment-related costs.
Lenders assess refinance applications using the same serviceability criteria as new loans, including the 20 per cent rental income discount and the three percentage point interest rate buffer. If your income or financial position has changed since the original loan was approved, the new lender may offer a lower loan amount or require updated documentation to verify your capacity to service the increased debt.
Refinancing does not reset the negative gearing rules. If your property was purchased before 7:30pm AEST on 12 May 2026, you retain access to negative gearing under the existing rules regardless of how many times you refinance. The grandfathering provision is tied to the date of acquisition, not the date of the loan contract. For further detail on how refinancing affects your overall loan structure, the refinancing section provides additional context on timing and cost considerations.
Structuring loans for portfolio growth
Investors building a property portfolio typically separate each property loan rather than consolidating them into a single facility. Separate loans provide flexibility to sell one property without triggering a full discharge or refinance, and they allow you to match loan features to the specific purpose of each asset. A loan secured against your Preston home to fund a deposit is distinct from the investment loan secured against the purchased property, and each loan can have different interest rates, repayment structures, and terms.
Loan structuring also affects tax deductions. Interest on borrowings used to acquire or hold an investment property is deductible, but interest on borrowings for private purposes is not, even if the loan is secured against an investment property. If you redraw funds from an investment loan to pay for personal expenses, the interest on the redrawn amount is not deductible. Keeping investment borrowings separate from private debt protects the deductibility of interest and simplifies your tax return.
As your portfolio grows, lenders assess your total exposure and the concentration of risk across your assets. Some lenders cap the number of investment properties they will finance for a single borrower, or they require higher equity contributions once your portfolio exceeds a certain value. Planning your loan structure with future growth in mind allows you to maintain access to finance as your portfolio scales.
For Preston investors using their existing property to access deposit funds, understanding how equity works across multiple assets is critical. The equity release loans page outlines how lenders assess available equity and the costs involved in accessing it.
What Preston investors should prepare before applying
Preston's proximity to the CBD, access to public transport along the Marnong corridor, and mix of established homes and newer townhouse developments make it an active market for investors. Properties close to Preston Market, High Street retail, and the train station attract consistent rental demand from young professionals, families, and students attending nearby institutions. Vacancy rates in the broader Darebin area remain low, and rental yields for units and townhouses tend to be higher than for detached houses due to the lower purchase price relative to weekly rent.
Before applying, confirm your borrowing capacity by reviewing your income, existing debts, and the rental income the property is likely to generate. Use a borrowing power calculator to estimate how much you can borrow, and factor in upfront costs including stamp duty, conveyancing, building and pest inspections, and lender fees. The property buying cost calculator provides a breakdown of these costs based on purchase price and deposit size.
If you are purchasing an investment property for the first time, consider how the loan will affect your ability to borrow for future properties or upgrade your own home. Lenders assess your total debt position, and taking on an investment loan reduces the amount you can borrow for other purposes. Structuring your first investment loan correctly sets the foundation for portfolio growth and ensures you retain flexibility as your financial position improves.
Call one of our team or book an appointment at a time that works for you to discuss your investment loan application and how to structure your finance for long-term portfolio growth.
Frequently Asked Questions
What rental income do lenders use when assessing an investment loan application?
Lenders order a rental assessment as part of the property valuation and use the lower end of the assessed rental range. They then discount that figure by 20 per cent to account for vacancy periods and maintenance costs, meaning only 80 per cent of the expected rent is included in serviceability calculations.
Can I use equity from my Preston home to fund an investment property deposit?
Yes, you can use equity from an existing property to fund the deposit and associated costs. Usable equity is typically capped at 80 per cent of the property's value minus the outstanding loan. Releasing equity means your home secures both the original loan and the new investment borrowing.
How do the new negative gearing rules affect my borrowing capacity?
Lenders have not changed their serviceability models in response to the negative gearing changes, because they calculate serviceability on gross income and rental income before any tax offsets. The negative gearing benefit affects your after-tax cash flow and investment strategy, but not the income figures the lender uses to approve the loan.
Why are investor interest rates higher than owner-occupied rates?
Investor loans carry higher risk for lenders because investment properties are typically sold before an owner-occupied home if a borrower faces financial difficulty. Investor rates are usually 20 to 60 basis points higher than owner-occupied rates, depending on the lender and your loan-to-value ratio.
Should I structure my investment loans separately or consolidate them?
Investors building a portfolio typically separate each property loan to maintain flexibility. Separate loans allow you to sell one property without triggering a full discharge, match loan features to each asset, and protect the tax deductibility of interest by keeping investment borrowings separate from private debt.
