Comparing home loans is more than lining up the lowest advertised interest rate and picking the smallest number. Australian mortgage brokers evaluate loans across five dimensions — interest rate, fees, comparison rate, features, and LVR tiers — to determine the true cost of borrowing over the expected life of the loan. This guide explains how a proper loan comparison works, the calculator logic that drives it, and how to think like a broker when comparing your own options in 2026.
When a mortgage broker compares two or more home loans for a client, they do not stop at the headline interest rate. A loan with a 5.99 percent rate and 395 dollars in annual fees may cost more over five years than a loan with a 6.19 percent rate and zero ongoing fees — depending on the loan amount and how long you hold the loan. Here are the five dimensions that matter.
The interest rate is the starting point — the annual percentage applied to your outstanding balance. In July 2026, the lowest advertised owner-occupier variable rate is 5.69 percent from Reduce Home Loans, while the Big Four range from 5.99 percent at Westpac to 6.15 percent at CBA. Fixed rates range from 5.89 percent for 1 year to approximately 6.09 percent for 3 years.
Interest rate matters most for large loans over long periods. A 30-basis-point difference on a 600,000-dollar loan costs approximately 1,800 dollars per year or 54,000 dollars over a 30-year term. The larger your loan, the more rate matters relative to fees.
Fees come in two categories: upfront and ongoing. Upfront fees include application fees (typically 0 to 600 dollars), valuation fees (0 to 300 dollars), settlement fees (100 to 300 dollars), and legal fees. Ongoing fees include annual package fees (typically 0 to 395 dollars), monthly account-keeping fees (0 to 10 dollars per month), and discharge fees (0 to 350 dollars).
A loan with a 5.99 percent rate and a 395-dollar annual fee costs 5,975 dollars in fees over 15 years, adjusted for inflation. A loan with a 6.19 percent rate and zero annual fees costs nothing in ongoing fees. The comparison comes down to whether the rate saving exceeds the fee cost.
Mortgage brokers calculate the total cost of ownership using a formula that combines the interest rate and fees into a single dollar figure over a defined period — typically five years, which is the average time an Australian borrower holds a loan before refinancing.
The comparison rate is a statutory figure that every Australian lender must display alongside their advertised rate. It combines the interest rate with most fees and charges into a single percentage. However, the comparison rate assumes a 150,000-dollar loan over 25 years, which skews it toward making fees look more impactful than they actually are on larger loans.
For example, a loan with a 5.99 percent headline rate and a 395-dollar annual fee might have a comparison rate of 6.15 percent. On a 150,000-dollar loan, that 395-dollar annual fee represents a meaningful fraction of the borrowing cost. On a 600,000-dollar loan, the same 395 dollars is proportionally much smaller, and the true effective rate is closer to the headline rate.
The comparison rate is most useful for comparing two loans with the same loan amount and term, and it becomes less reliable as the loan amount diverges from 150,000 dollars. For loans above 300,000 dollars, a broker's total-cost calculation is more accurate than the published comparison rate.
Home loan features affect the effective cost of borrowing in ways that are not captured by the interest rate or comparison rate. Three features have the most significant financial impact:
Offset account: A 100 percent offset account links a transaction account to your mortgage. Every dollar in the offset account reduces the loan balance for interest calculation purposes. If you have a 500,000-dollar loan at 6.19 percent and keep 40,000 dollars in your offset account, interest is calculated on 460,000 dollars — saving you approximately 2,476 dollars per year. A broker values an offset account based on your expected average offset balance over the comparison period.
Redraw facility: Redraw lets you withdraw extra repayments you have made above the minimum. It is less powerful than an offset account for tax purposes — particularly for investors — but it adds flexibility that a basic loan without redraw cannot match. Brokers value redraw based on your expected surplus income available for extra repayments.
Extra repayment flexibility: Some loans cap extra repayments or impose fees for early repayment. For borrowers who plan to pay down their loan faster than scheduled — which is common among first home buyers building equity and investors who receive lump sums — unlimited extra repayments without penalty are a valuable feature that a broker will weigh in the comparison.
Loan-to-valuation ratio determines both the interest rate you receive and whether you pay Lenders Mortgage Insurance. Most lenders offer their best rates at an LVR of 70 percent or below, with rate premiums applying at 80 percent, 90 percent, and 95 percent LVR bands.
At 95 percent LVR, the rate premium over the lender's best rate is typically 50 to 80 basis points, and LMI adds another 10,000 to 15,000 dollars in upfront cost on a 500,000-dollar purchase. A broker evaluating two loans will check whether the rate you have been quoted matches your LVR — a borrower at 85 percent LVR should not be comparing the lowest advertised rate, which typically applies at 70 percent LVR.
A proper comparison calculator replicates the methodology that a mortgage broker uses when presenting options to a client. Here is the step-by-step logic:
The calculator needs your loan amount, loan term (typically 30 years), repayment type (principal and interest or interest-only), and payment frequency (monthly, fortnightly, or weekly). Fortnightly repayments reduce total interest by approximately 4 to 5 years over the life of a 30-year loan, so the payment frequency matters for total cost comparisons.
For each loan being compared, enter the interest rate, upfront fees, annual fees, and whether an offset account is included. The calculator should allow you to enter an expected average offset balance if an offset account is part of the product — this adjusts the effective interest rate by applying the offset to the loan balance.
The comparison period should match how long you realistically expect to hold the loan before refinancing or selling. The Australian average is approximately 5 years, but first home buyers may hold longer and investors may refinance sooner. A good calculator defaults to 5 years but allows you to adjust.
The calculator computes the total cost for each loan over the comparison period: total interest paid plus total fees paid minus offset account interest savings. The result is a dollar figure — not a rate — that represents your actual cost of borrowing over the comparison window. The loan with the lowest total cost is the winner.
A more sophisticated calculator also shows the remaining loan balance at the end of the comparison period. Two loans might have similar total costs over 5 years but different remaining balances — the loan with the lower remaining balance has built more equity, which is worth real money when you refinance or sell.
Let us compare two actual loans available in July 2026 for a 600,000-dollar owner-occupier with a 20 percent deposit, 30-year term, and principal and interest repayments.
Loan A — ING Mortgage Simplifier: 5.99 percent variable rate, 0 dollars annual fees, no offset account. Monthly repayment: approximately 3,591 dollars. Total interest over 5 years: approximately 174,800 dollars. Total fees over 5 years: 0 dollars. Total cost: approximately 174,800 dollars. Remaining balance: approximately 557,600 dollars.
Loan B — Macquarie Offset Home Loan: 6.19 percent variable rate, 0 dollars annual fees, 100 percent offset account with a 20,000-dollar average offset balance. Monthly repayment: approximately 3,665 dollars. Total interest over 5 years (with offset applied): approximately 174,100 dollars. Total fees over 5 years: 0 dollars. Total cost: approximately 174,100 dollars. Remaining balance: approximately 556,400 dollars.
In this comparison, Loan B is marginally cheaper — saving approximately 700 dollars over 5 years — despite having a headline rate that is 20 basis points higher. The offset account does the work. For a borrower who expects a higher average offset balance — say 40,000 dollars — Loan B becomes significantly cheaper, saving approximately 2,500 dollars over 5 years compared to Loan A.
This example illustrates why a headline rate comparison is insufficient. The offset account value depends on your actual savings behaviour, not the advertised rate.
Understanding market conditions is essential context for any loan comparison. As of July 2026, the RBA cash rate is 3.85 percent, down from 4.35 percent in 2025. Variable rates are roughly 135 to 185 basis points above the cash rate, reflecting lender margins that have compressed as competition for high-quality borrowers intensifies.
The APRA serviceability buffer remains at 3 percent, meaning lenders must assess your ability to repay the loan at your actual rate plus 3 percent. The DTI cap of 6x — introduced in February 2026 — limits new lending to borrowers whose total debt exceeds six times their income. Both rules affect which loans you are eligible for and should be considered alongside rate comparisons.
Refinance cashback offers of up to 4,000 dollars remain available from select lenders as of July 2026, which can cover discharge and application costs when switching. If you are comparing your current loan against a new one, the cashback should be deducted from the total cost of the new loan in your comparison.
For most borrowers, the most important factor is the total cost over the expected holding period — typically five years. This combines the interest rate, fees, and the value of features like offset accounts. The headline rate matters, but it is only one variable in a larger equation. A loan that is 20 basis points more expensive on rate but includes a useful offset account can be cheaper overall if you maintain a meaningful offset balance.
Use the comparison rate for a quick filter — it is useful for narrowing a long list of loans down to a shortlist. Use a total-cost calculator for the final decision, especially if your loan is above 300,000 dollars. The comparison rate's 150,000-dollar assumption makes it increasingly inaccurate as loan size increases. For loans above 500,000 dollars, the gap between the comparison rate and the true effective rate can exceed 30 basis points.
An offset account reduces the effective interest rate by applying your savings balance against the loan principal for interest calculation purposes. The value of the offset depends on your expected average balance. If you hold 20,000 dollars in offset on a 500,000-dollar loan at 6.19 percent, your effective rate drops to approximately 5.94 percent — a 25-basis-point saving. A broker calculates this as interest saved per year divided by the loan balance, then compares the effective rate across products.
The fees with the largest impact are annual package fees (typically 395 dollars), application fees (up to 600 dollars), and LMI premiums (if your LVR exceeds 80 percent). Ongoing monthly account-keeping fees of 5 to 10 dollars seem small but add up to 60 to 120 dollars per year — equivalent to 1 to 2 basis points on a 600,000-dollar loan. Discharge fees of 200 to 350 dollars are relevant when comparing loans with an exit plan.
The mortgage industry consensus is to re-compare your loan every 12 to 18 months. Australian lenders adjust rates frequently, and the competitive landscape shifts. A loan that was the best deal 18 months ago may now be 50 basis points above the market. Set a calendar reminder, run a comparison calculator with your current loan against the market's best offers, and refinance if the difference exceeds 50 basis points — which is the typical threshold where the savings justify the refinancing effort.
Rate data sourced from Ratesniffers, Finder, Canstar, and lender websites as of July 2026. RBA cash rate data from the Reserve Bank of Australia. APRA serviceability buffer and DTI cap details from the Australian Prudential Regulation Authority. Average loan holding period of five years based on published industry data from the Mortgage and Finance Association of Australia.
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