Common Mistakes When Comparing Home Loans

Comparing home loans feels like comparing phone plans until you realise the wrong loan structure could block your second purchase or trap you in an uncompetitive rate for years.

The decision you're making is not which loan looks cheapest today, but which loan gives you the most room to grow your portfolio, refinance when needed, and access the features that matter for rentvesting. Loans that appear identical on rate can differ significantly in portability, offset functionality, split loan options, and serviceability treatment. Those differences compound over time.

Comparing Advertised Rates Without Checking the Loan Type

Advertised rates rarely tell you whether the loan suits investment property or how the lender assesses rental income. A lender offering a headline rate of 5.89% might apply only 70% of your rental income to serviceability, while another at 5.94% might apply 80%, which can mean the difference between approval and refusal when you try to buy a second property. The rate is not the constraint on your portfolio. Serviceability is.

Consider a buyer purchasing an investment property in Wollongong with expected rent of $600 per week. One lender might assess $504 per week as available income, the other $480. That $24 weekly difference translates to roughly $65,000 in borrowing capacity at current variable rates, enough to determine whether a second property is within reach or not. Rate comparisons that ignore how rental income is treated will lead you toward the wrong lender.

Choosing a Fixed Rate Without Understanding Break Costs

Fixed rates offer certainty but carry break costs if you need to exit early. Those costs are calculated based on the difference between your fixed rate and the lender's wholesale funding rate at the time you break. If rates drop after you fix, the cost to exit can run into tens of thousands of dollars, particularly in the first two years of the fixed term.

We regularly see buyers lock in a three-year fixed rate, then need to refinance or sell within 18 months due to a job change, property upgrade, or portfolio restructure. Break costs in that scenario can exceed $15,000 on a $500,000 loan, wiping out any rate saving they thought they had secured. If your circumstances might shift, or if you plan to add a second property within the fixed term, a split loan structure offers more flexibility without exposing your entire loan to break cost risk.

Ignoring Whether the Loan is Portable Across Properties

Portability matters when you're building a rentvesting portfolio or planning to move from investment to owner-occupier. Some lenders allow you to transfer the loan to a different security without reapplying or paying discharge fees. Others treat it as a full refinance, which means a new application, new valuation, and potential LMI if your equity position has shifted.

In a scenario where you own an investment property in the Central Coast and later decide to buy an owner-occupier home in Sydney, portability allows you to keep your existing investment loan in place without triggering discharge and reapplication costs. Non-portable loans force you to refinance or hold both loans separately, which can push you into higher LVR territory and limit your ability to borrow for the second purchase. Rentvesting specifically requires flexibility across multiple properties, and portability is one of the features that keeps your options open as your strategy evolves.

Overlooking Offset Account Restrictions on Investment Loans

Not all offset accounts function the same way on investment loans. Some lenders offer full 100% offset, others offer partial offset, and some require the offset to be linked to the same entity that holds the loan. If you're planning to hold surplus cash in an offset to reduce interest while preserving deductibility, the difference between full and partial offset can cost thousands per year.

A rentvestor holding $30,000 in a linked offset on a $450,000 investment loan at 6.00% per annum saves roughly $1,800 per year in interest with a full offset. A partial offset at 50% saves only $900. That $900 annual difference adds up over a 10-year hold period, and it's not captured in any rate comparison tool. If your strategy includes building cash reserves or splitting loans to quarantine deductible debt, offset account functionality needs to be part of the loan comparison, not an afterthought.

Assuming All Lenders Treat HECS Debt the Same Way

HECS debt reduces your borrowing capacity, but the size of that reduction varies by lender. Some lenders apply the current repayment rate based on your taxable income, others apply a higher buffer or assume a percentage of your gross income regardless of whether you've hit the repayment threshold yet. For rentvesting buyers carrying HECS debt, choosing a lender that applies a lower reduction can add $50,000 to $80,000 in borrowing capacity.

If you're purchasing an investment property while carrying $40,000 in HECS debt and earning $95,000 per year, one lender might reduce your borrowing capacity by $320 per month while another reduces it by $480 per month. That difference determines whether you can borrow $480,000 or $520,000, which directly affects the suburbs and property types available to you. Rate comparison without serviceability comparison is incomplete, particularly for buyers with HECS debt or other non-mortgage liabilities.

Not Checking Whether the Lender Will Refinance You Later

Some lenders write loans they won't refinance later. This happens most often with low-deposit investment loans or loans written under non-standard serviceability policies. If you take out a loan at 90% LVR with a second-tier lender, you may find that lender won't offer you a competitive refinance rate when your fixed term expires, and mainstream lenders won't take you on until your LVR drops below 80%.

We've worked with rentvestors locked into uncompetitive rates post-fixed-term because their original lender wouldn't refinance them and no other lender would touch them at 85% LVR. The gap between their current rate and the market rate was 1.20%, costing them $5,400 per year on a $450,000 loan. Choosing a lender based solely on the initial rate without considering their refinance appetite or post-fixed pricing leaves you exposed to rate hikes you can't escape. Loan health checks pick up these risks before they compound.

Focusing on Features You Won't Actually Use

Loan comparison tools emphasise features like redraw, extra repayments, and fee waivers, but not all of those features matter for investment loans. Redraw can be useful, but if you're holding your surplus cash in an offset for tax reasons, redraw becomes irrelevant. Similarly, unlimited extra repayments sound valuable until you realise that paying down investment debt faster reduces your deductible interest, which is the opposite of what you want for rentvesting.

The features that matter for rentvesting are portability, offset availability, split loan capability, and how the lender treats rental income and future borrowing capacity. Rate comparison should filter for those features first, then compare rate within that subset of suitable lenders. Starting with rate and hoping the features align is backwards, and it results in loans that look good on paper but don't support your strategy in practice.

Call one of our team or book an appointment at a time that works for you. We'll walk through your portfolio goals, compare lenders based on the features that matter for rentvesting, and structure your loan to support future growth rather than locking you into a product that only works for your first purchase.

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