What is a comparison rate and why does it matter?
A comparison rate shows the true annual cost of a home loan by combining the interest rate with most upfront and ongoing fees, expressed as a single percentage. A higher comparison rate than the advertised rate means fees are adding meaningful cost to the loan. Use it as a starting point for comparing products, not the final word, since it doesn't capture every fee or reflect your actual loan size.
The Fuller Picture
Lenders are required by law to display a comparison rate alongside their advertised interest rate. The calculation is standardised — it assumes a $150,000 loan over 25 years — and rolls in the interest rate plus most known fees, including monthly account fees and loan establishment costs. The result is a single percentage that makes it easier to compare loans on a more honest basis.
The gap between the advertised rate and the comparison rate tells you something real. A loan advertised at 5.89% with a comparison rate of 6.12% means fees are adding around 0.23% to the effective annual cost. A loan at 5.99% with a comparison rate of 6.00% likely carries very few fees. A gap of 0.5% or more is worth examining closely before you proceed.
The standardised $150,000 benchmark is low relative to what most buyers actually borrow. On a $700,000 loan, a flat monthly fee has a much smaller proportional impact than the comparison rate formula assumes. This means comparison rates can make fee-heavy loans look worse than they are at real loan sizes — and why running your own numbers matters.
What This Means for Your Purchase
When you're comparing home loan offers, the advertised rate alone can mislead. Lenders compete hard on headline rates and sometimes recover margin through fees. The comparison rate cuts through this by putting both on the same scale — which makes it the more useful number when you're shortlisting lenders before applying for pre-approval.
Where buyers go wrong is treating the comparison rate as definitive. It excludes some costs: discharge fees, redraw fees, break costs on fixed-rate loans, and any charge that isn't fixed in advance. If you're likely to refinance within a few years or use your redraw facility regularly, those excluded costs can matter more than the comparison rate implies.
The practical implication: use the comparison rate to narrow your field, then ask your broker or lender for a full fee schedule on the products you're seriously considering. For investment loans, interest deductibility also changes which product is cheapest on an after-tax basis — something comparison rates don't account for at all.
How This Shows Up in the Illawarra
Illawarra buyers typically borrow between $500,000 and $900,000, depending on whether they're buying in Wollongong, the northern suburbs, or further south around Shellharbour and Kiama. At these loan sizes, the $150,000 benchmark in the comparison rate formula becomes less meaningful — a flat monthly fee that looks significant on paper is almost negligible spread over a $750,000 loan. When a lender's comparison rate looks marginally higher than a competitor's, the actual dollar difference at your loan size may be very small.
Because auction buying is common in the Illawarra market, loan product decisions often need to be made quickly after going unconditional. Comparison rates give you a useful filter when you're reviewing products under time pressure — but ask your broker to model the real cost over your expected hold period before you sign. That extra step takes minutes and gives you far more useful information than the headline figures alone.
Frequently Asked Questions
Is the comparison rate the same as the interest rate?
No. The interest rate is the charge on your outstanding balance. The comparison rate combines that rate with most fees to give a fuller cost figure. It will always be equal to or higher than the advertised interest rate.
What fees are excluded from the comparison rate?
Government fees, stamp duty, redraw fees, discharge fees, and any charge that isn't fixed in advance — like break costs on fixed loans — are excluded. This means the comparison rate can understate the true cost of some products, particularly fixed-rate loans.
As a first home buyer, should I focus on the loan with the lowest comparison rate?
It's a reasonable starting point, but remember the benchmark is calculated on $150,000 — far less than most first home buyers borrow. Ask your broker to run the actual numbers on your loan amount before deciding, since the ranking can change at real loan sizes.
When do I see the comparison rate during the buying process?
Lenders must display comparison rates in all advertising and in your loan documents. You'll see them when comparing products during pre-approval, and again in the credit contract before you sign.
Can I negotiate the fees that affect the comparison rate?
Sometimes. Some lenders will waive establishment fees or reduce monthly fees for borrowers with larger deposits or strong income profiles. A mortgage broker will often know which lenders are open to this, and can ask on your behalf.
Does a buyers agent help with understanding loan costs?
A buyers agent doesn't provide credit advice, but they work alongside mortgage brokers and can refer you to one suited to your circumstances. Knowing your loan product clearly before you bid or make an offer removes a significant source of stress from the buying process.
If you want to understand how loan costs sit alongside purchase costs before you commit, we're happy to talk through the numbers with you. Reach out and we can connect you with the right people.
