The Core Criteria Lenders Apply to Investment Loans
How Lenders Treat Rental Income — and Why It Reduces Your Capacity
Rental income is not counted dollar-for-dollar by any mainstream lender. The standard practice is to shade rental income at between 70% and 80% of the assessed figure — meaning a property generating $40,000 per year in rent might contribute only $28,000 to $32,000 of effective income in a lender's serviceability model. This shading reflects vacancy allowances, management fees, maintenance costs, and the risk that rental income is not as stable as employment income. The result is that many investors find their actual borrowing capacity is significantly lower than the face-value rental yield would imply.
At 4.35%, the RBA cash rate is directly reflected in the variable rates lenders are charging, and the rental income shading problem compounds the serviceability buffer. An investor with a $600,000 existing mortgage and one rental property already has a substantial portion of their assessed income consumed by existing debt obligations before a second investment loan is even considered. REAStats has documented the affordability fracture this creates across markets, with entry points ranging from $550,000 in Mandurah to $2,400,000 in Randwick — a disparity that shapes both the investor's target market and their loan structure choices.
For investors exploring interest-only structures to manage cash flow, lenders apply additional scrutiny. APRA guidance requires lenders to assess whether a borrower can service the loan on a principal-and-interest basis even if they are granted an interest-only period. This means interest-only approval does not reduce the assessed repayment figure — it must still meet the principal-and-interest serviceability test. Many investors are surprised to discover this, particularly when refinancing existing interest-only loans at the end of a fixed term. Reviewing your full debt exposure before applying is not optional — it is the single most important step in preparing a competitive application. For a deep dive into tax structuring across your portfolio, the Australian Property Tax Guide is a practical starting point.
LVR, Deposit Requirements, and Lender Mortgage Insurance for Investors
Investment loans carry stricter loan-to-value ratio requirements than owner-occupier loans at most lenders. While owner-occupiers can sometimes borrow up to 95% LVR with Lenders Mortgage Insurance (LMI), investors are typically capped at 90% LVR with LMI, and many lenders prefer to limit investment lending to 80% LVR to avoid LMI entirely. At 80% LVR on a $700,000 purchase, the borrower needs a $140,000 deposit plus purchase costs — a figure that is out of reach for many investors without existing equity in an owner-occupied property. For broader market data and lending trends, REAStats tracks how LVR policy shifts are affecting activity across different price segments.
The use of equity from an existing property as a deposit — a cross-collateralisation structure — is common but carries risks that lenders do not always volunteer. If one property falls in value, the lender may recalculate the combined LVR across both securities and require the borrower to reduce the debt or provide additional security. Investors who structured their portfolios using equity draws during the low-rate period between 2020 and 2022 may now find their buffers thinner than expected, particularly in markets where values have softened. Understanding how depreciation schedules can improve cash flow within a compliant structure is also worth examining — see the Property Depreciation Schedules Explained guide for the full framework.
Practical Steps to Strengthen an Investment Loan Application
Reducing credit card limits before applying has a direct impact on assessed borrowing capacity. Lenders calculate the maximum monthly repayment on each credit card limit — not the current balance — and include that figure in the serviceability assessment. A borrower with $20,000 in credit card limits across two cards may have their borrowing capacity reduced by $80,000 to $100,000 compared to someone who has cancelled unused cards. This is one of the most actionable and underutilised levers available to investment borrowers in the lead-up to an application.
Working with a mortgage broker who specialises in investment lending — rather than a retail bank branch — is increasingly the practical choice. Brokers have access to lender credit policies that are not publicly advertised and can match a borrower's profile to the lender most likely to approve at the desired LVR and structure. Given the complexity of rental income shading, self-employed income treatment, and cross-collateralisation risk, professional guidance is not an optional extra — it is a material advantage in a market where a single declined application leaves a credit enquiry on your file.
This article was produced with AI assistance and reviewed for accuracy. Content is for informational purposes only and does not constitute financial or property investment advice.
