Comparing investment loans can feel overwhelming when every lender seems to offer something different.
The most important thing to understand is that the lowest rate doesn't always deliver the lowest cost or the most flexibility over time. Interest rates matter, but so do loan features like offset accounts, redraw access, portability, and how the lender treats rental income when you want to grow your portfolio. The goal is to match loan features to your property investment strategy, not just chase the lowest number.
Interest Only vs Principal and Interest: How the Numbers Work
Interest only investment loans reduce your monthly repayments by letting you pay only the interest portion for a set period, typically five years. Principal and interest loans require you to pay down the debt from day one.
Consider a property investor who borrows $500,000 to purchase a rental property in Paddington. On an interest only loan, monthly repayments might sit around $2,000 depending on the rate. On principal and interest, that figure could jump to $2,700 or more. The difference is roughly $700 per month in cash flow.
This matters when rental income doesn't fully cover your costs. If the property rents for $550 per week, you're bringing in around $2,380 per month. With interest only, you might be close to neutral or slightly negative. With principal and interest, you're funding a larger gap each month. That gap might be worth it if you're focused on paying down debt, but many investors prefer to preserve cash flow and use the difference to save for the next deposit or manage vacancy periods.
Variable Rate or Fixed Rate: What to Consider for Rental Properties
Variable interest rates move with the market, while fixed rates lock in for a set term, usually one to five years. Neither is better in every situation.
Variable rates give you access to offset accounts and redraw without restriction. You can make extra repayments, pay off the loan early, or refinance without break costs. If you're building a portfolio and expect to access equity or refinance within a few years, flexibility often outweighs the certainty of a fixed rate.
Fixed rates protect you from rate rises during the fixed term, which can help with budgeting and cash flow management. But they come with restrictions. Most fixed rate products limit extra repayments to $10,000 or $20,000 per year. If you want to refinance or sell before the fixed term ends, break costs can run into thousands of dollars.
In our experience, investors with one or two properties often split their loan between fixed and variable to balance certainty with flexibility. Investors planning to grow their portfolio quickly usually stick with variable to avoid being locked in.
Loan to Value Ratio and Lenders Mortgage Insurance: The Real Impact on Borrowing
Lenders Mortgage Insurance applies when you borrow more than 80% of the property's value. The LVR is the percentage of the property value you're borrowing.
If you buy a $600,000 investment property in Holland Park with a $480,000 loan, your LVR is 80%. No LMI applies. If you borrow $540,000 on the same property, your LVR is 90%, and LMI could add $15,000 to $20,000 to your upfront costs.
LMI doesn't reduce your interest rate or improve your loan terms. It protects the lender, not you. Some investors choose to pay it to get into the market sooner or to preserve equity in other properties. Others wait until they have a larger deposit to avoid the cost entirely. There are also no LMI loans available through certain lenders and professions, which can save tens of thousands on higher LVR loans.
The LVR also affects your interest rate. Lenders typically offer better rates at 80% LVR or below. The rate discount can be 0.20% to 0.40% lower than loans above 80%, which adds up over the life of the loan.
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Rental Income and Borrowing Capacity: How Lenders Assess Your Next Loan
Lenders assess rental income differently depending on their policy. Most lenders take 80% of the rental income when calculating your borrowing capacity. Some take 100%, others take less.
If your rental property in New Farm generates $600 per week, one lender might count $480 per week toward your income, while another counts the full $600. That difference affects how much you can borrow for your next property.
Vacancy rate assumptions also vary. Some lenders factor in a buffer for vacancy periods, which reduces the income they count. Others don't. If you're planning to buy a second or third investment property, the lender's treatment of rental income becomes more important than the interest rate on your first loan.
This is where borrowing capacity assessments before you commit to a lender can save you from being stuck with a loan that limits your portfolio growth.
Offset Accounts and Claimable Expenses: Tax Deductions That Actually Work
Offset accounts reduce the interest you pay by offsetting your savings balance against your loan balance. If you have a $400,000 investment loan and $30,000 in your offset account, you only pay interest on $370,000.
The interest you save isn't counted as income, so you don't pay tax on it. More importantly, you maintain the full loan balance for negative gearing benefits. Interest on investment loans is a claimable expense, so the higher your loan balance, the more you can claim. Paying down the principal directly reduces your deductible interest over time.
Some lenders charge higher rates for loans with offset accounts. Others include them at no additional cost. The rate difference is usually 0.10% to 0.20%. Whether that cost is worth it depends on how much you keep in the offset. If you regularly hold $20,000 or more, the interest saved usually outweighs the higher rate.
Portability and Refinancing: Keeping Your Options Open
Portability lets you transfer your loan to a new property without refinancing. If you sell your investment property and buy another one, you can move the loan across without reapplying or paying discharge fees.
Not all lenders offer portability, and those that do often have conditions. You might need to settle the new property within a certain timeframe, or the loan amount might need to stay the same or increase.
If portability isn't available or doesn't suit your situation, refinancing becomes the alternative. Refinancing lets you access equity, switch lenders for a lower rate, or consolidate multiple loans. It requires a full application, valuation, and settlement process, which takes time and involves costs like discharge fees and application fees.
Investors who plan to turn over properties or upgrade within a few years should check portability terms before committing to a lender. Those holding long-term can focus more on rate and offset features.
How to Compare Investment Loan Options Without Missing What Matters
When you're comparing investment loan products, start with your strategy, not the lender's brochure. Write down whether you're planning to hold long-term or sell within five years, whether you want to build a portfolio or stick with one property, and whether cash flow or tax deductions matter more to you right now.
Then look at how each loan handles rental income, whether it includes an offset, what the LVR and rate discount structure looks like, and whether the loan gives you access to equity when you need it. The interest rate is part of the picture, but it's not the whole picture.
Lenders across Australia offer different investment loan features depending on whether you're buying an established property, building, or purchasing through a self-managed super fund. Accessing investment loan options from multiple lenders gives you the full range of products to compare, not just what one bank offers.
If you're in Queensland, local market conditions matter too. Vacancy rates in Brisbane's inner suburbs like Fortitude Valley or Kangaroo Point run lower than in outer growth areas, which affects rental income and borrowing capacity. Body corporate fees in apartment-heavy areas add to your holding costs and reduce serviceability. Your loan needs to account for the type of property and location you're investing in, not just the loan amount.
Call one of our team or book an appointment at a time that works for you. We'll walk through your property investment strategy and show you which loan features line up with where you're heading, not just what's available today.
Frequently Asked Questions
Should I choose interest only or principal and interest for an investment loan?
Interest only loans reduce monthly repayments by roughly $700 per month on a $500,000 loan, which improves cash flow if rental income doesn't cover all costs. Principal and interest loans build equity faster but require higher monthly repayments, which can make it harder to manage vacancy periods or save for your next deposit.
How does LVR affect my investment loan interest rate?
Lenders typically offer rate discounts of 0.20% to 0.40% for loans at 80% LVR or below compared to loans above 80%. Borrowing above 80% also triggers Lenders Mortgage Insurance, which can add $15,000 to $20,000 or more in upfront costs depending on your loan amount.
Do all lenders count rental income the same way?
No. Most lenders count 80% of rental income when assessing borrowing capacity, but some count 100% while others count less. This difference becomes significant when you're applying for a second or third investment loan, as it affects how much you can borrow.
What loan features matter most for building a property portfolio?
Flexibility matters more than rate when you're growing a portfolio. Look for loans that let you access equity without refinancing, count rental income generously, and avoid fixed rate restrictions that could cost you thousands in break fees if you need to refinance early.
Should my investment loan include an offset account?
Offset accounts save you interest without reducing your loan balance, which preserves your tax deductions. If you regularly hold $20,000 or more in savings, the interest saved usually outweighs the slightly higher rate that some lenders charge for offset features.
