Comparison Rate vs Interest Rate: Why the Lowest Rate Isn’t Always the Cheapest Home Loan

By Andrew Paterson

You spot a home loan advertised at a sharp rate. It looks like the best deal going.

But the advertised rate only tells you part of the story. The real question is what the loan actually costs you over a year once fees and features are in the mix.

That is where the comparison rate vs interest rate distinction matters. Get it wrong and you can pay more on a “cheaper” loan.

Let me walk you through the maths with real 2026 numbers so you can see where the lowest rate wins and where it quietly costs you.

Lowest Rate Does Not Equal Cheapest Loan

Here is the short version you can hold onto.

• The interest rate is the cost of borrowing the money. Nothing else.
• The comparison rate (often called the “true rate”) folds most fees into a single figure so you can compare loans fairly.

Lenders are legally required to display the comparison rate next to the advertised rate under the National Credit Code.

So the comparison rate is the better guide. But it has a catch that almost no one explains.

The comparison rate trap on a real loan size

The comparison rate is calculated on a standardised example: a $150,000 loan over 25 years.

Most people in Geelong are not borrowing $150,000. The national average first home buyer loan sat at $614,000 in the March 2026 quarter, and the average new owner-occupier loan hit $734,881, a figure worth weighing against what income you’d need to service a loan that size.

On a loan four or five times the size of the standard example, fixed annual fees get spread differently. The comparison rate understates the fee impact on a large loan.

That is why a dollar example beats a percentage every time. Let’s run one.

The Numbers Behind Advertised Rates in 2026

A quick lay of the land so the example makes sense.

• The RBA cash rate is 4.35% (effective 17 June 2026), a level you can trace back through our coverage of the cash rate’s climb to 4.35%.
• The next decision lands on 11 August 2026.
• The average owner-occupier variable rate for new loans is around 5.90% p.a. (June 2026).

One more thing worth flagging. Fixed rates in some cases are now cheaper than variable, so the “rates only move one way” thinking does not hold right now. If you’re weighing that decision, our complete guide to fixing your home loan rate walks through it in more depth.

I’m using these figures as illustrative benchmarks, not offers. Live rates change daily and depend on your situation.

Basic Home Loan vs Package Home Loan: A Worked Example

This is where most comparison sites stop. They define the terms and leave you to guess the dollars. Let’s not do that.

Two loan types dominate the market.

1. Basic (no-frills) variable loan. Low rate, low or no annual fee, usually no offset account.
2. Package or offset loan. Comes with an offset account and extras, but carries an annual fee or a slightly higher rate.

Package annual fees in 2026 sit across a real range:

• Westpac Premier Advantage: $395 a year
• Macquarie offset: $248 a year
• Bank Australia offset: $199 a year

Let’s use a $600,000 Geelong first home buyer loan and the typical big-four package fee of $395 to see how it plays out.

Scenario: $600,000 loan, basic vs package

For a clean comparison, imagine the basic loan sits at 5.75% and the package sits at 5.90% with a $395 fee. (Illustrative rates only.)

• Basic loan interest (year one): $600,000 x 5.75% = $34,500. No annual fee. Total cost: $34,500.
• Package loan interest (year one): $600,000 x 5.90% = $35,400. Plus $395 fee. Total cost: $35,795.

On paper the basic loan is $1,295 cheaper in year one.

But that ignores what the offset account can do. If you park cash in the offset, you reduce the interest you pay. So the package can claw that gap back and then some, which is a big part of why offset accounts have surged in popularity as rates climbed.

The question becomes: how much cash do you need sitting in the offset to make it worth the fee?

The Offset Break-Even: The Number No One Runs

Here is the calculation that turns a vague “an offset pays for itself” claim into a hard threshold.

An offset only saves interest on the balance you keep in it. So work out the balance that saves you exactly the fee.

Annual fee divided by your interest rate = break-even offset balance.

At 5.90% with a $395 fee:

$395 ÷ 0.059 = roughly $6,695.

You need around $6,695 sitting in the offset year-round, on average, just to cover the annual fee. Below that average balance, the fee eats more than the offset saves you.

Above it, the offset starts winning. Hold $30,000 in there consistently and the saving stacks up fast.

This is the number to weigh. Not “do I want an offset” but “can I realistically keep more than the break-even balance in it most of the time.”

When the break-even shifts

A couple of factors move the threshold.

• A lower fee lowers the bar. A $199 offset fee needs only about $3,373 in the account to break even.
• A higher rate lowers the balance needed too, because each dollar in the offset saves more interest.
• As your loan balance drops over the years, the fee can eventually outweigh the interest saved. Worth reviewing every few years, much like the checkpoints we cover in why a new financial year is a good trigger to review your home loan.

Matching the Loan to Your Situation

There is no single right answer here. The best loan depends on your goals, your cash flow and how things may change. That is the assessment a broker does with you.

But I can give you the criteria to weigh, which is more useful than a blanket rule.

If you’re a first home buyer on a tight budget

Consider this. If most of your savings went into the deposit and costs, an offset sitting near empty earns nothing while the fee still applies. This is one of several traps worth understanding before you sign, alongside the pitfalls we’ve flagged in how to avoid a common home buyer trap.

In that case, a lower true-rate basic loan often makes sense. You keep the cost down and skip a fee you can’t yet make work.

But do not write off the offset entirely. Circumstances change. If you expect lumpy income, a tax refund, a bonus or a pay rise, an offset can suit you sooner than you think.

The point is to weigh it, not to flip a switch based on today’s balance alone.

If you’re an upgrader with a cash buffer

Say you’ve sold a home and have proceeds sitting in savings, or you keep a healthy emergency fund.

If that balance comfortably clears the break-even (well above $6,695 in our example), the offset likely pays for itself many times over. The package can be the cheaper option despite the higher headline rate and the fee.

The offset feature works when you keep a reasonable amount of cash in it regularly. If you do, the maths tends to favour it.

The Bit Almost No One Connects: Borrowing Power

Chasing a headline rate affects more than your repayments. It shapes how much you can borrow.

Lenders stress-test your application at your rate plus a 3 percentage point buffer, set by APRA and confirmed to stay at 3% in 2026.

So a 5.90% loan gets assessed as if it were 8.90%.

A lower actual rate can lift your assessed borrowing capacity, because the buffered rate you’re tested against is lower too. This is a dimension the pure comparison-rate pages never link to product choice.

Local Context: Geelong Loan Sizes and the $600,000 Line

The $600,000 figure in my example is not random. It maps neatly to the Geelong market and a Victorian threshold that matters.

Recent PropTrack figures put the Greater Geelong median house value at around $793,000 (up 3.2% over the year) and the median unit at $584,000.

Plenty of first home buyer suburbs land lower:

• Armstrong Creek: around $688,000
• Charlemont: around $646,000
• Corio: around $575,000
• Norlane: around $520,000

That matters because Victoria’s first home buyer stamp duty full exemption cuts out at $600,000, with a sliding concession up to $750,000.

So buying in Corio or Norlane can keep you under the exemption line entirely. There is also a $10,000 First Home Owner Grant for new homes valued at $750,000 or less, on top of schemes like the 5% Deposit Scheme that’s already helped thousands of first home buyers.

These figures are administered by the State Revenue Office and depend on your eligibility. Confirm the current rules at sro.vic.gov.au before you count on them.

How to Compare Home Loans Without Getting Caught

A simple checklist to run before you commit.

1. Read the comparison rate, not just the advertised rate. But remember it is built on a $150,000 loan, so it understates fees on your larger loan.
2. Add up the annual fees over the full loan term. A $395 fee across 30 years is real money.
3. Run the offset break-even. Fee divided by rate gives the balance you need to hold.
4. Match features to your actual cash flow, not to a wishlist.
5. Factor in borrowing power. The rate affects how much you can borrow, not just what you repay.
6. Review every few years. As the balance falls, the best structure can change.

None of this is complicated once you see the dollars laid out. The trick is doing the maths before you sign, not after.

Where a Broker Fits

The right loan is a moving target. It depends on your income pattern, your savings, your plans and the way features interact.

That’s the job we do at Aussiewide: pull live products, run the numbers on your real loan size and match the structure to where you’re heading, not just where you are today.

If you’re weighing a basic loan against a package or offset, we can run your specific break-even and show you the annual cost side by side.

General advice only. This information does not take into account your objectives, financial situation or needs. Consider whether it is appropriate for you and seek advice from a qualified adviser or broker before acting.

Rates and fees are illustrative and current as at August 2026 and subject to change without notice. The 5.90% figure is an average benchmark, not an offer. Verify live rates and fees directly with the lender before acting.

Comparison rates are calculated on a standardised example, commonly $150,000 over 25 years, and are true only for that example. Different loan amounts and terms produce different comparison rates.

Victorian stamp duty exemption, concession and FHOG figures are current for 2026-27 but administered by the State Revenue Office and subject to eligibility. Confirm at sro.vic.gov.au. Off-the-plan concessions are temporary and sources conflict on expiry, so confirm current status with the SRO or your conveyancer.

For investors, interest deductibility and offset structuring can have tax consequences. Seek independent tax advice. The RBA cash rate as at August 2026 is 4.35%, with the next decision on 11 August 2026. Do not treat any rate outlook as a forecast to rely on.

Frequently asked questions

Is the lowest interest rate always the best home loan?

No. The advertised interest rate only covers the cost of borrowing. Once you add annual fees and account for features like an offset, a slightly higher-rate loan can work out cheaper. Always compare the total annual cost in dollars, not just the headline rate, and factor in whether you’ll use the features you’re paying for.

What is a comparison rate or true rate?

The comparison rate folds most loan fees into a single percentage so you can compare loans fairly. Lenders must display it by law. The catch: it’s calculated on a standardised $150,000 loan over 25 years, so on a larger loan of $600,000 or more it understates the real fee impact. Use it as a guide, then run your own dollar figures.

How much do I need in an offset to make it worth the fee?

Divide the annual fee by your interest rate. At a $395 fee and a 5.90% rate, that’s $395 divided by 0.059, or roughly $6,695. You need around that balance sitting in the offset year-round on average just to cover the fee. Hold more than that consistently and the offset starts saving you money.

Basic home loan vs package home loan, which is cheaper?

It depends on your cash. A basic loan has a lower rate and little or no fee but usually no offset. A package loan has an offset plus a fee, often $199 to $395 a year. If you keep a decent cash balance in the offset, the package can be cheaper. If your savings run thin, the basic loan often wins. There’s no single answer, so run the break-even for your situation.

Does the interest rate affect how much I can borrow?

Yes. Lenders stress-test your application at your rate plus a 3 percentage point buffer set by APRA. So a 5.90% loan is assessed as if it were 8.90%. A lower actual rate can lift your assessed borrowing capacity, which is one more reason the rate matters beyond just your repayments.