When to Compare Investment Loans & What to Look For

Understanding What You're Actually Comparing

An investment loan comparison is only useful when you know which features will affect your returns and which ones won't matter for your situation. The advertised rate is one data point, but the loan structure, offset capability, repayment flexibility and portability all influence how much wealth you keep.

Consider a buyer looking at a two-bedroom unit near Parramatta with rental income covering most of the mortgage. A loan with a rate 0.15 per cent lower but no offset account might cost more over time than a slightly higher rate with full offset, because the rental income sits idle instead of reducing interest daily. The comparison needs to account for how the loan works with your cash flow, not just the percentage on the product disclosure.

The policy environment has also shifted. Under the Treasury Laws Amendment (Tax Reform No. 1) Act 2026, net rental losses on established residential dwellings acquired after 12 May 2026 are quarantined from 1 July 2027 and can only offset other residential rental income or future gains. Properties held before that date, and eligible new builds, remain under existing negative gearing rules. This changes the value proposition of certain loan structures depending on when and what you buy.

Interest Rate Structure and Your Holding Strategy

Your loan's rate structure should align with how long you intend to hold the property and whether you expect rates to move. A variable rate gives you flexibility to make extra repayments, access redraw and refinance without penalty. A fixed rate locks in certainty for a set period but usually comes with restrictions on additional payments and higher exit costs if your plans change.

In our experience, investors who plan to leverage equity within two to three years to purchase additional properties tend to favour variable rates because portability and penalty-free refinancing matter more than short-term rate protection. If your strategy involves holding a single property long-term with stable cash flow, a partial fixed rate on interest-only terms can provide budget certainty without locking up all your flexibility.

The distinction matters more now that the capital gains tax discount for individuals has been replaced with cost base indexation and a minimum 30 per cent tax rate on real gains for affected assets acquired after 1 July 2027. Longer holding periods and the ability to adapt your loan as tax rules evolve make loan flexibility a planning tool, not just a convenience.

Offset Accounts and Interest-Only Periods

An offset account linked to your investment loan reduces the interest charged without lowering your loan balance, which preserves the deductibility of interest on the full borrowing. If you hold rental income or surplus cash in a 100 per cent offset, every dollar reduces your interest cost in real time while keeping your loan structure intact for tax purposes.

Interest-only periods allow you to minimise your repayment outlay and redirect cash flow toward other investments or a deposit on a second property. Most lenders offer interest-only terms of five years, with some extending to ten years for investors with lower loan-to-value ratios. When the interest-only period ends, the loan reverts to principal and interest unless you negotiate an extension or refinance.

As an example, an investor purchasing a unit in the Inner West with rental income of around $650 per week might structure the loan as interest-only with a full offset account. Rental income sits in the offset, reducing the interest charged, while the investor preserves the option to pay down the loan or use that cash elsewhere. The loan amount remains fully deductible, and the repayment stays predictable.

Borrowing Capacity and Serviceability Under DTI Caps

From 1 February 2026, APRA's debt-to-income cap limits lenders to funding no more than 20 per cent of new investor loans at a DTI of six times or greater. Serviceability is assessed using a buffer of three percentage points above the product rate. If you earn $120,000 and want to borrow $720,000 for an investment property, you sit at the DTI threshold and your lender will assess whether you can service the loan at the product rate plus the buffer.

This affects how much you can borrow and which lender will approve your application. Some lenders allocate their DTI capacity to investors with larger deposits or existing property portfolios. Others reserve capacity for first-time investors or refinance applicants. Comparing loan products without understanding each lender's serviceability policy can result in a declined application that affects your credit file and delays settlement.

If you're planning to build a portfolio, borrowing capacity becomes the constraint before deposit size does. The rental income from your first property helps service the second loan, but lenders typically shade rental income by 20 per cent to account for vacancy, and they add body corporate fees and other holding costs back into your expense calculation.

Loan Portability and Future Flexibility

Loan portability lets you transfer your existing loan to a new property without refinancing or paying discharge fees. If you sell your current investment property and purchase another within a set timeframe, usually 90 days, the loan moves across and your rate, offset and other features remain unchanged.

This matters when you want to upgrade within your portfolio or consolidate two properties into one without triggering break costs on a fixed loan or losing a discounted rate you negotiated years earlier. Not all lenders offer portability, and those that do often impose conditions around loan-to-value ratio, property type and location.

In a scenario where an investor holds a property in the Hills District and wants to sell and reinvest in a higher-yielding property closer to the CBD, a portable loan allows the transition without resetting the loan terms. If the loan isn't portable, the investor pays discharge fees, application fees and potentially a higher rate on the new loan, eroding the financial benefit of the portfolio shift.

Lenders Mortgage Insurance and Deposit Requirements

Most lenders require a minimum 20 per cent deposit for investment property to avoid Lenders Mortgage Insurance. If your deposit is smaller, LMI is added to your loan amount and increases your borrowing cost. Some lenders will accept a 10 per cent deposit with LMI, but serviceability is tighter and the interest rate is often higher.

Using equity from your owner-occupied home to fund the deposit on an investment property is common, but it increases your overall debt and reduces the buffer in your existing loan. If property values decline or rental income drops, you may not have enough equity to refinance or access further funds. The loan-to-value ratio across both properties needs to sit within your lender's policy, and cross-collateralisation can limit your ability to sell one property without the lender's consent.

Comparing loan products means comparing deposit requirements, LMI premiums and how each lender treats equity release. A lender offering a lower rate but requiring 25 per cent deposit might be less accessible than one accepting 15 per cent with a slightly higher rate, depending on your equity position and cash reserves.

Rate Discounts and Ongoing Loan Management

The rate you receive at settlement is not always the rate you keep. Many lenders offer introductory discounts that expire after 12 months, or they increase their standard variable rate over time without increasing your discount. Regular loan health checks help you identify when your rate has drifted above market and whether refinancing would reduce your interest cost.

Rate discounts are often negotiable based on your loan amount, deposit size and whether you hold other products with the lender. A discount of 0.80 per cent on a $600,000 loan saves around $4,800 per year compared to a 0.60 per cent discount, assuming the base rate is the same. That difference compounds over a ten-year hold and affects your net return after all expenses.

If you're comparing investment loan products, request the comparison rate, which includes most fees, and confirm whether your discount is fixed for the life of the loan or subject to review. Some lenders reserve the right to reduce your discount if you refinance part of your facility or request a product switch, which limits your flexibility without penalty.

Tax Deductibility and Loan Purpose

Interest on borrowings used to acquire or hold a residential rental property is deductible to the extent the property is rented or genuinely available for rent. If you redraw funds from your investment loan for private purposes, that portion of the interest is no longer deductible. Keeping your investment loan separate from your owner-occupied loan and avoiding redraw for non-investment purposes protects your deduction and simplifies your tax reporting.

Under the new negative gearing rules effective 1 July 2027, net rental losses on affected properties are quarantined and can only offset residential rental income or future residential capital gains. Interest remains deductible, but the loss can't reduce your taxable salary or other income. Properties held before 12 May 2026, and eligible new builds that increase dwelling supply, are grandfathered and continue under existing rules.

This shifts the comparison toward loans that support properties with positive or near-neutral cash flow, or loans structured to support new build acquisitions where full negative gearing still applies. The loan's tax efficiency is now tied to the property acquisition date and dwelling type, not just the interest rate and features.

Call one of our team or book an appointment at a time that works for you. We'll review your situation, compare loan options from lenders across Australia, and help you structure finance that aligns with your property investment strategy and the current tax and regulatory settings.

Frequently Asked Questions