Treat the portfolio as one position
An investment property application is not assessed in isolation. A lender can consider the debt secured against your home, existing rental lending, credit limits, business obligations, income and a portion of expected rent. Different lenders may assess the same information differently.
That makes lender selection important, but the first task is to understand the whole position. We map every property, loan, security, repayment type and ownership entity. We then add the proposed purchase and test what changes. The result is more useful than asking only for the maximum available loan.
The aim is to answer four questions clearly. Can the current transaction be approved? What will it cost to hold? How should the lending be separated and repaid? What capacity, security or flexibility remains afterwards?
Deposit and LVR settings
The Reserve Bank's loan to value ratio rules place speed limits on the share of new bank lending that can be made at high LVRs. As at the date this page was reviewed, investor lending above 70 percent LVR is classified as high LVR, and no more than 10 percent of a bank's new investor lending can fall into that category. This is not a promise that 70 percent lending will be approved. A bank can apply a lower LVR based on the property or borrower.
There are exemptions and special cases, including qualifying construction lending and combined collateral calculations. Check the current settings directly on the Reserve Bank LVR restrictions page.
Equity in an owner occupied home can sometimes support an investment purchase, but cross securing properties creates practical consequences. Selling, refinancing or changing one property may require the lender's consent across the wider group. We explain the available security structures so you can discuss legal ownership and asset protection with your solicitor.
Debt to income rules and lender serviceability
Reserve Bank DTI restrictions apply to new residential bank lending. Current settings allow up to 20 percent of investor lending to borrowers with a DTI ratio above 7. The rules are bank speed limits, not an individual entitlement. Banks still apply their own affordability tests and policies, while non bank providers are outside the Reserve Bank DTI restriction.
The official calculation and current exemptions are explained in the Reserve Bank DTI guidance. The guidance also shows that total residential mortgage debt and assessed gross income, including qualifying rental income, are relevant to the ratio.
Serviceability is a separate test. A lender may shade rental income, apply test interest rates, allow for property expenses and include limits even where a credit card balance is zero. Because the detailed method varies by lender and changes over time, we calculate against the lenders being considered rather than publish one borrowing multiple as if it applied everywhere.
Principal and interest or interest only
Principal and interest repayments reduce the balance over time. Interest only repayments keep the scheduled payment lower during the agreed period but do not reduce principal. When the interest only period ends, the required principal and interest payment can be higher because the remaining balance must be repaid over a shorter term.
ANZ's published investor guide confirms this basic distinction and warns that there is no single structure suitable for everyone. Read its interest only repayment explanation as a product example. The term available, approval requirements and price depend on the selected lender.
The choice should connect to a documented purpose. Cash flow flexibility may matter during a renovation or while income is uneven. Debt reduction may matter more where the goal is to build resilience or restore borrowing capacity. We model both paths and make the trade off visible.
Tax treatment needs specialist advice
Finance structure and tax treatment are related, but mortgage advice is not tax advice. Inland Revenue's residential property rules determine when rental expenses and interest can be claimed, and the correct treatment depends on how borrowed funds are used and the ownership involved.
Current official guidance is available from Inland Revenue on residential property interest rules and residential rental property deductions. We recommend confirming the proposed ownership and loan use with your accountant before settlement. A separate loan account can make the purpose of borrowing easier to trace, but your accountant should determine the tax treatment.
Information that makes an application stronger
A complete review normally needs:
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Income evidence for each borrower and entity involved.
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Current rental statements, tenancy agreements or market rent evidence where relevant.
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Loan statements and limits for all personal, property and business debt.
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Property values, rates, insurance, body corporate charges and other holding costs.
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The sale and purchase agreement and any due diligence conditions.
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Details of renovations, subdivision, development or changes to tenancy.
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A clear explanation of the purchase purpose and the intended repayment strategy.
We use that information to compare lender appetite, serviceability, structure and conditions. The lender still makes the final credit decision.
Plan the next decision now
A rate is visible; lost flexibility is not. Before accepting an investment facility, consider how a future sale, refinance, renovation, business need or next purchase would interact with the security and repayments. The recommendation should make those dependencies clear.
Explore construction and development finance if the property is a new build or project. For commercial property or borrowing through an operating business, see business, commercial and asset finance. You can also talk to a Homelend adviser about the portfolio as a whole.
This page provides general information only. Reserve Bank settings, tax rules and lender criteria can change. Investment decisions should also be reviewed with your solicitor, accountant and other relevant professionals.