Your investment loan structure should change as your income grows and your portfolio evolves.
Most enrolled nurses start with a conservative loan structure that gets them into the market, then leave it untouched for years. The loan that worked when you were earning base shift rates might now be costing you equity access or rental income efficiency now that you're picking up weekend and night penalties. Optimising an investment loan means adjusting the structure to match where you are now, not where you were when you signed the paperwork.
Interest Only vs Principal and Interest: When Each Structure Works
Interest only repayments keep your cashflow flexible and your deductions higher, while principal and interest builds equity and reduces your loan balance over time.
Consider an enrolled nurse who bought a unit in Parramatta as a first investment property. On interest only, monthly repayments sit around $2,100 at current variable rates on a loan amount of $500,000. Switching to principal and interest pushes that closer to $3,200. If rental income covers $2,300 per month after property management fees and body corporate, the shortfall on interest only is manageable at $200 per fortnight from your wages. On principal and interest, you're covering $900 per fortnight out of pocket.
Interest only makes sense when you're prioritising cashflow to save for a second deposit or when rental income doesn't yet cover principal repayments comfortably. Principal and interest makes sense once your income has increased enough to absorb the higher repayment, or when you want to reduce debt before refinancing to release equity for expanding your property portfolio.
Most lenders allow interest only terms for up to five years on investment loans, with the option to extend or convert depending on your loan to value ratio and serviceability at the time of review.
Variable vs Fixed: Rate Structure and Flexibility
Variable rates give you full access to offset accounts and unlimited extra repayments, while fixed rates lock in your repayment amount but limit your flexibility.
An enrolled nurse working rotating shifts with irregular penalty rates benefits from a variable rate because you can park extra income in an offset account linked to the investment loan. Every dollar in offset reduces the interest charged daily, but you can still access that cash if a tenant vacates or if you need to cover an unexpected repair. Fixed rates don't allow offset on most investment loan products, so any lump sum you want to put towards the loan either sits in a separate savings account earning taxable interest, or goes onto the loan as a permanent extra repayment you can't redraw.
Some investors split their loan amount across both rate types. Half the loan stays variable with an offset facility, and the other half fixes for two or three years to lock in a portion of the repayment. This approach works if you want certainty on part of your commitment but still need access to surplus funds without losing the tax benefit of offset interest savings.
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When Refinancing Cuts Costs Without Restructuring
Refinancing moves your loan to a different lender to access better investor interest rates or lower fees, without changing your repayment type or loan term.
If you've been with the same lender for more than two years and haven't reviewed your rate, there's often a margin between what you're paying and what new investors are offered. A 0.30% reduction on a $500,000 investment loan saves roughly $1,500 per year in interest. That difference either improves your cashflow or lets you direct more into an offset account to reduce taxable rental income.
Investment loan refinancing also resets your ability to negotiate. Lenders offer rate discounts to attract new business, so moving your loan can secure a discount you wouldn't receive by staying put. You'll need to factor in discharge fees from your current lender and application fees with the new one, but these are often waived or rebated during refinance campaigns.
Refinancing works when your loan structure is still appropriate but the rate or features no longer are. Restructuring works when your financial position or investment strategy has shifted enough that the loan type itself needs to change.
Equity Release and Portfolio Growth Timing
You can access equity from an existing investment property to fund a deposit on a second property once your loan to value ratio allows it.
If your Parramatta unit was purchased for $600,000 with a 10% deposit and is now valued at $680,000, you've gained $80,000 in equity plus whatever principal you've repaid. Lenders typically allow you to borrow up to 80% of the property's current value without paying Lenders Mortgage Insurance on the additional borrowing. At 80%, that's $544,000 available. Subtract your current loan balance of $480,000, and you have $64,000 in usable equity.
That equity can be released by refinancing your existing investment loan and increasing the loan amount, or by applying for a separate equity release loan secured against the property. The released funds then become your deposit and settlement costs for a second investment property. The original loan structure might stay as interest only, while the new equity portion could be structured separately depending on how you plan to service the additional debt.
Timing matters because property values fluctuate and lender appetite for investment lending tightens or loosens depending on regulator guidance. If you're planning to grow your portfolio, restructure or refinance before property prices climb further and your borrowing capacity tightens.
Tax Deduction Strategy and Loan Purpose
Interest on an investment loan is only deductible if the borrowed funds are used to purchase or improve an income-producing asset.
If you refinance your investment loan and increase the loan amount to release equity, the interest on that additional borrowing is only deductible if the released equity is used for another investment property or investment purpose. If you use the equity to renovate your own home or buy a car, the interest on that portion is not claimable. Lenders will split your loan into separate accounts to preserve the deductibility of each portion, but the structure needs to be set up correctly at the time of refinancing.
This is also why redrawing principal repayments from an investment loan can create issues. If you've been making extra repayments on a principal and interest loan and then redraw those funds for personal use, the interest on the redrawn amount is no longer deductible. The loan structure needs to keep investment borrowing separate from personal borrowing to maximise tax deductions and avoid issues if the ATO reviews your claims.
Investment Loan Features That Support Long-Term Holding
Offset accounts, portability, and the ability to switch between interest only and principal and interest without refinancing give you control as your circumstances shift.
An investment loan with an offset account linked to your variable portion means you can reduce interest costs without locking funds into the loan permanently. Portability allows you to sell the current investment property and transfer the loan to a new one without reapplying or paying discharge fees. The ability to switch repayment types within the same loan means you're not forced to refinance just to move from interest only to principal and interest when the initial term expires.
These features cost nothing to have available, but not all investment loan products include them. When you're comparing loan options or deciding whether to refinance, check whether the new loan allows the same flexibility. A lower rate that strips out offset or portability might save you money now but cost you more in flexibility later if your plans change or your portfolio grows.
Call one of our team or book an appointment at a time that works for you. We'll review your current investment loan structure, compare it against what's available now, and identify whether refinancing or restructuring makes sense based on your income, rental income, and where you're heading with property investment.
Frequently Asked Questions
Should I use interest only or principal and interest for an investment loan?
Interest only keeps repayments lower and maximises rental income cashflow, which suits investors who want flexibility or are saving for another deposit. Principal and interest builds equity faster and reduces debt, which works when your income can absorb the higher repayment or when you're preparing to release equity.
When should I refinance my investment loan?
Refinance when you can access a lower rate, reduce fees, or gain features like offset or portability that your current loan lacks. If you haven't reviewed your rate in over two years, refinancing often delivers immediate interest savings without changing your loan structure.
Can I use equity from my investment property to buy another property?
Yes, you can release equity by refinancing and increasing your loan amount up to 80% of the property's current value. The released equity can fund a deposit on a second investment property, and the interest on that borrowing remains deductible as long as it's used for investment purposes.
What happens if I redraw principal repayments from my investment loan?
If you redraw funds and use them for personal purposes, the interest on the redrawn amount is no longer tax deductible. To preserve deductions, keep investment borrowing separate from personal use and avoid redrawing unless the funds are used for another investment.
Do I need to restructure my investment loan if my income increases?
Not always, but if your income now supports principal and interest repayments or allows you to borrow more for portfolio growth, restructuring can help you build equity faster or access funds for a second property. Review your loan structure whenever your financial position shifts significantly.
