Comparison rate vs interest rate: how to shop for a refinance without comparing the wrong number

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You have seen both numbers on every lender ad: a big interest rate and a smaller comparison rate — or sometimes the other way around when fees are heavy.

Most Australians know the comparison rate exists. Far fewer know what it actually measures, what it ignores, and why two loans with the same headline rate can cost different amounts over five years.

If you are refinancing — or asking your bank for a retention discount — comparing the wrong figure is one of the most expensive mistakes you can make without realising it.

This guide explains both rates in plain English, how they are regulated, and a practical compare-like-for-like method you can use this week. General information only — not personal credit advice.

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The 30-second version

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What the interest rate actually is

Your interest rate (sometimes called the advertised rate or headline rate) is what the lender charges on your outstanding balance over time.

On a standard principal-and-interest loan, each repayment splits between:

• interest — the cost of borrowing; and
• principal — the amount that actually reduces what you owe.

A lower headline rate usually means less interest per month, all else equal.

But “all else equal” rarely holds when you refinance:

• Package fees ($395/year-style home loan packages are common)
• Offset account fees or minimum balances
• Valuation, discharge, and settlement charges when switching
• Cashback offers with clawback if you leave early
• Loan term reset — extending back to 30 years lowers repayments but can increase lifetime interest

That is why regulators require a second number.

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What the comparison rate is — and how it is calculated

Australian lenders must show a comparison rate on home loan advertising under the National Consumer Credit Protection framework. The idea is simple: help consumers see fees, not just headlines.

ASIC’s Moneysmart guidance describes the comparison rate as a tool to compare the total cost of loans — but on standard assumptions:

• $150,000 loan amount
• 25 years
• principal and interest repayments

What is typically included

• The interest rate
• Most up-front and ongoing fees tied to the loan
• Repayment frequency assumptions built into the model

What is not fully captured

Takeaway: treat the comparison rate as a better billboard, not a personal quote.

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Why the two rates diverge — a real pattern (illustrative)

Loan B looks cheaper on the headline. Loan A can be cheaper on total cost once the package fee flows through — especially on smaller balances where fees weigh more.

Run your balance through the refinance calculator or ask a broker to model total cost over your remaining term.

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Five traps when Australians refinance using only the headline rate

1. Ignoring package fees that never “feel” like interest

A $395 annual fee is roughly $33 a month before tax effects — equivalent to roughly 0.08% on a $500,000 loan, and more on smaller loans. Waiving the fee in retention talks is often easier than winning another 0.10% off the rate.

2. Comparing a new 30-year term to your remaining 24 years

A lower repayment on a fresh 30-year term can still mean more interest over life. Align terms when comparing — see break-even beyond the headline.

3. Chasing cashback without netting clawback

Cashback can improve short-term break-even — and destroy it if you sell or switch inside the clawback window. Net the rebate against rate + fees, not against the marketing banner alone. More in refinance savings beyond the monthly line.

4. Forgetting offset changes when you switch banks

Moving surplus cash between offsets changes effective interest even when headline rates look similar. Read offset vs redraw before you move operational balances.

5. Skipping discharge and setup costs in “rate gap” maths

A 0.40% saving is meaningless if $4,000 of switching costs and 12 months of clawback erase the win. Pair rate compare with five signs to review your loan.

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How to compare refinance offers fairly (step by step)

Step 1 — Start with your current loan truth sheet

Write down:

1. Headline rate and comparison rate (if shown on statements)
2. Monthly repayment and remaining term
3. Package fee and offset balance
4. Fixed expiry date (if any)
5. Last retention offer (if you asked in the past 12 months)

Step 2 — Ask for retention in writing before you switch

Same-lender repricing can avoid discharge costs. The refinance wave guide explains repricing vs switching — many files stop at retention once total cost is modelled.

Step 3 — Collect one external quote on matched assumptions

Give the broker or lender:

• loan purpose (owner-occupier vs investor);
• approximate balance and remaining term;
• repayment type (P&I vs interest-only);
• whether you need offset / split / portability.

Step 4 — Compare comparison rates, then model your loan size

Scale the result to your balance:

• If comparison rate gap is 0.15% on $700,000, that is material.
• On $200,000, fee waivers may matter more than basis points.

Step 5 — Run break-even and decide with a date

Break-even months ≈ total switching costs ÷ monthly repayment saving

Decide within 7–14 days so comparison does not turn into months of drift — the pattern in wait for cuts or refinance now still applies even without timing the RBA.

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When the headline rate matters more than the comparison rate

Sometimes the headline is the right focus:

• Large offset balance — effective interest can sit below both advertised numbers.
• Short remaining term — fees amortise over fewer years.
• Breaking fixed — break cost may swamp rate differences; compare fixed expiry timing.
• Debt consolidation into one loan — structure and term matter as much as rate.

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FAQs

Is the comparison rate the same as APR?

Similar idea — a single number capturing rate plus key fees — but Australian comparison rates use prescribed assumptions ($150,000 / 25 years). Your personal APR-like experience depends on your balance and behaviour.

Can two loans have the same comparison rate but different costs for me?

Yes. Offset use, term length, and cashback clawbacks change your outcome.

Do all lenders calculate comparison rates identically?

The methodology is standardised for advertising, but your quote should still list fees separately — read the credit proposal or key fact sheet.

Should I pick the lowest comparison rate on a comparison site?

Use it to shortlist, then run matched-term modelling. Comparison sites may not show your LVR tier, profession discounts, or relationship pricing.

Does comparison rate include break costs on fixed loans?

No. If you are exiting fixed early, model break costs separately.

Is a broker-paid loan more expensive on comparison rate?

Broker channel pricing is often competitive with direct — the comparison rate still helps you compare products. How brokers are paid is explained in broker fees in Australia.

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Primary sources

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The bottom line

• Use the headline rate to start the conversation.
• Use the comparison rate to filter misleading ads.
• Use your balance, term, fees, offset, and switching costs to make the decision.

That three-layer habit is what stops “0.30% better on paper” from becoming “more expensive in real life.”

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Next step — we will compare your current loan to retention and external options on matched terms:

• Send an enquiry with your rate, comparison rate (if known), balance, and OO/investor purpose
• Call 0400 77 77 55 for a quick sense-check
• Apply pathway if you are ready to lodge
• Refer a friend who is comparing ads without reading the fine print

General information only. This article does not consider your objectives or situation. Speak with a mortgage broker or qualified adviser before acting.