Top 10 Ways to Optimise Your Investment Loan

Optimising your investment loan means making sure every feature, rate and structure choice works to support your property goals, not just fill a gap in your cashflow.

Most investors focus on securing approval and then leave the loan unchanged for years. That approach leaves money on the table. Whether you own one property or several, the way your lending is set up affects your tax position, your borrowing capacity for future purchases, and how much rental income you keep each month. Optimisation is about matching loan features to your situation as it changes, not just at the start.

Everton Park investors are often asset-rich but time-poor. Many own property in the area or nearby suburbs like Mitchelton and Stafford, sometimes alongside holdings in growth corridors further out. When lending isn't structured with flexibility in mind, portfolio expansion becomes harder than it needs to be.

Splitting Your Loan Between Fixed and Variable Rates

A split loan divides your borrowing between a fixed portion and a variable portion, letting you lock in certainty on part of the debt while keeping flexibility on the rest.

Consider an investor who refinanced a property in Everton Park with a loan amount of around the suburb's median. They split the loan 50/50 between fixed and variable. The fixed portion gave them predictable repayments for budgeting, while the variable portion allowed unlimited extra repayments and access to an offset account. When rental income exceeded expectations, they parked surplus cash in the offset, reducing interest on the variable half without penalty. When rates dropped, they benefited immediately on that portion. The split gave them stability without locking away all their flexibility.

You can adjust the split ratio to suit your risk appetite. A 70/30 split favouring variable gives more flexibility. A 30/70 split favouring fixed suits investors who prefer predictable costs. Your choice depends on whether you value certainty or access to features like offset and redraw.

Choosing Interest-Only Repayments to Improve Cashflow

Interest-only repayments reduce your monthly outgoing by deferring principal repayment, which can improve cashflow and increase the amount you can borrow for your next purchase.

An investor holding a unit near Hilder Road recently moved from principal and interest to interest-only on their investment property loan. The monthly saving was around $600, which they redirected into their offset account linked to their owner-occupied home loan. That strategy reduced non-deductible interest on their home while keeping the investment loan interest fully claimable. When they applied for a second investment loan, the lower repayment on the existing property improved their serviceability, helping them secure approval without needing additional income.

Interest-only periods are typically available for up to five years at a time, after which the loan reverts to principal and interest unless you request an extension. Not all lenders offer the same terms, and some apply higher interest rates to interest-only loans. The cashflow benefit needs to outweigh any rate premium. If your goal is portfolio growth rather than debt reduction, interest-only can be a powerful tool when used with intention.

Using an Offset Account to Reduce Interest Without Losing Deductions

An offset account is a transaction account linked to your loan. The balance in the account reduces the interest charged on the loan without changing the loan balance itself, so your deductions stay intact.

Offset accounts work particularly well for investors who receive irregular rental income or who are building cash reserves for future purchases. If you have $20,000 sitting in the offset, you save interest on that portion of the loan every day, but the full loan balance remains deductible. The offset balance is also liquid, so you can access it at any time without reapplying or paying redraw fees.

Not all investment loans include an offset account, and some lenders charge a higher rate for the feature. You need to calculate whether the interest saving exceeds the rate difference. For investors holding multiple properties, using one offset account linked to the loan with the highest rate delivers the most value. If you are holding cash for a deposit on your next purchase, an offset account gives you a return equal to your loan rate, which is often higher than a savings account after tax.

Structuring Loans Separately for Each Property

Each investment property should have its own standalone loan, even if you buy them at the same time, to keep your tax records clear and your options flexible.

If you bundle multiple properties under one loan or cross-collateralise them, it becomes difficult to sell one property without refinancing the others. Separate loans also make it simpler to claim interest deductions accurately, particularly if one property is sold or used for a different purpose later. When you apply for future lending, lenders assess each property individually, and separate loans make that process faster.

Some lenders encourage cross-collateralisation because it reduces their risk, but it increases yours. If you need to switch lenders on one property to access better rates or features, you may be forced to discharge multiple mortgages, triggering break costs and legal fees across the portfolio. Keeping loans separate costs nothing extra and protects your flexibility as your circumstances change.

Reviewing Your Loan Structure After Legislation Changes

Tax rules affecting residential investment property changed significantly from mid-2026, and your loan structure may need adjusting depending on when you bought and what you plan to do next.

Properties held before 12 May 2026 continue to allow full negative gearing against all income, including wages. Properties acquired after that date are subject to quarantining rules from the 2027-28 income year, meaning losses can only be offset against other residential property income. Eligible new builds remain exempt. If you are planning to buy again, the type of property you choose now affects your tax position for years. If you already own multiple properties, the order in which you sell them may also matter.

Your loan structure should reflect the tax treatment of each property. For example, if you own a grandfathered property and a new build, you may want to prioritise debt reduction on the grandfathered property if you expect to sell it before the new build. Alternatively, you may want to maximise the loan on the new build to preserve full deductibility over time. These decisions depend on your individual circumstances, but they need to be considered now, not at tax time.

Accessing Equity Without Selling

Equity release lets you borrow against the value of a property you already own, without selling it, to fund your next purchase or to renovate and increase rent.

Everton Park has seen steady capital growth over the past decade, and many investors sitting on properties bought years ago have significant equity available. If your property has increased in value and your loan balance has reduced, you may be able to access that equity by increasing your loan or taking out a separate top-up facility. Lenders generally allow you to borrow up to 80 per cent of the property's current value without paying Lenders Mortgage Insurance, though some will lend higher with LMI.

Using equity to fund a deposit on a second property keeps your savings intact and compounds your portfolio growth. The interest on the additional borrowing is deductible as long as the funds are used for income-producing purposes. If you use equity to renovate the existing property or to buy your next home, the deductibility differs, so the loan needs to be structured accordingly. Keeping the purpose of each loan clear from the start avoids problems later.

Timing Your Refinance to Match Your Portfolio Goals

Refinancing isn't just about chasing a lower rate. It is also an opportunity to restructure your lending to align with where your portfolio is heading.

If your goal is to buy another property within the next 12 months, refinancing now to access equity, switch to interest-only, or move to a lender with higher borrowing capacity can set you up for that next purchase. If your goal is to reduce debt or prepare for retirement, refinancing to a principal and interest loan with lower fees might make more sense. Investors in Everton Park who bought during the low rate period a few years ago and fixed at under 2 per cent are now coming off those fixed terms. That is a natural point to reassess the whole structure, not just roll onto the variable rate your current lender offers.

Refinancing also resets your loan features. If your current loan does not include an offset account or does not allow interest-only, moving to a lender that offers those features can improve your position without increasing your rate. Some lenders also offer rate discounts or cashback incentives for refinancing, which can offset the cost of switching. The key is to treat refinancing as a strategic decision, not just a rate comparison.

Choosing the Right Loan Features for Your Stage

The features that matter most depend on whether you are buying your first investment property, growing a portfolio, or winding down.

In the early stage, features like offset accounts, redraw facilities, and the ability to switch between interest-only and principal and interest give you flexibility as your income and goals change. In the growth stage, high borrowing capacity, portability, and the ability to split loans or release equity matter more. In the consolidation stage, low fees, simple structures, and the ability to make extra repayments without penalty become priorities.

Investors often stick with the same loan product through every stage, even though their needs have shifted. A loan that worked well when you bought your first property may not suit you when you own three. Reviewing your features every few years, or whenever your circumstances change, keeps your lending aligned with your goals. If you are not using a feature you are paying for, or if you need a feature your current loan does not offer, it is worth having a conversation about what else is available.

Understanding How Serviceability Affects Your Next Purchase

Lenders assess your ability to borrow based on your income, your existing debts, and a buffer above the current interest rate. How your current loans are structured directly affects how much you can borrow next time.

If your existing investment loans are on principal and interest repayments, lenders use the actual repayment amount in their assessment. If they are on interest-only, lenders use the interest-only repayment, which is lower, leaving you with more borrowing capacity. If you have an offset account with a balance, some lenders will take that into account, while others will not. Rental income is also included, but most lenders only count 80 per cent of it to allow for vacancy and maintenance costs.

Small changes to your loan structure can make a significant difference to serviceability. Switching one loan to interest-only, paying down a small personal loan, or consolidating debts can lift your borrowing capacity by tens of thousands of dollars. If you are planning to buy again soon, it is worth running the numbers with a broker who understands how different lenders assess serviceability, rather than waiting until you have found a property and discovering you are short.

Keeping Your Loan Structure Simple Enough to Manage

Complexity for its own sake does not add value. The aim is to build a structure that is flexible, tax-effective, and sustainable without needing constant attention.

Some investors over-engineer their loans, splitting every property into multiple sub-accounts, linking offsets in complicated ways, and switching lenders every year. That can create confusion at tax time, increase the risk of errors, and make it harder to explain your position to future lenders. A well-optimised structure is one you understand, one your accountant can work with, and one that gives you the features you actually use.

If you own properties in Everton Park and other suburbs, and you are managing tenants, maintenance, and your own home, your loan structure should support your life, not complicate it. Work with your broker and your accountant together to make sure your loans, your tax strategy, and your long-term goals are all pointing in the same direction. Optimisation is not a one-time event. It is an ongoing process that adjusts as your portfolio grows and your priorities shift.

If you would like to review your current loan structure or talk through your options before your next purchase, call one of our team or book an appointment at a time that works for you.

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