Comparison Rate vs Headline Rate: The 15bp Hidden Cost Spread Explained 2026

The comparison rate is a single percentage figure that bundles a loan’s headline interest rate with most upfront and ongoing fees into one number, designed to show the true cost of a home loan over a 25-year, $150,000 loan model. According to the RBA’s November 2025 Statement on Monetary Policy, the average spread between headline variable rates and comparison rates across major Australian lenders sat at 15 basis points as of Q4 2025. In this piece, I’ll unpack exactly what drives that 15bp gap, which lenders are widening it, and how to use comparison rates without being misled by the assumptions baked into them.

What Is a Headline Rate?

The headline rate is the advertised interest rate on a home loan — the number you see on billboards, comparison websites, and bank product pages. It represents the annual interest cost as a percentage of the loan balance, before fees.

Here’s what the headline rate actually covers:

A variable headline rate of 6.04% p.a. (CBA’s Wealth Package OO P&I rate as of May 2026) means you pay 6.04% in interest annually on the outstanding balance. It doesn’t tell you anything about the $395 annual package fee, the $600 upfront application cost, or the $350 discharge fee when you leave.

This is the core problem the comparison rate was designed to solve — but the solution comes with its own limitations that I see trip up clients regularly.

What Is a Comparison Rate?

The comparison rate is a mandatory disclosure figure under the National Consumer Credit Protection Act 2009, enforced by ASIC. Every lender advertising a home loan interest rate in Australia must display a comparison rate alongside it, in the same font size or larger.

The legal formula behind it is fixed:

• Loan amount: $150,000
• Loan term: 25 years
• Repayment type: Principal and interest
• Included costs: Headline interest rate + most upfront fees (application, valuation, settlement) + ongoing fees (monthly/annual service fees)
• Excluded costs: Government charges (stamp duty, mortgage registration, transfer fees), LMI premiums, discretionary fees (redraw fees, late payment fees), offset account fees, and any conditional discounts not available to all borrowers

ASIC’s MoneySmart website confirms that the comparison rate “includes both the interest rate and most fees and charges relating to a loan, reduced to a single percentage figure.”

Here’s a practical example using real May 2026 numbers:

CBA Wealth Package Variable (OO P&I, LVR ≤ 80%)

The 17bp gap between 6.04% and 6.21% represents the dollar cost of those fees spread over the $150,000/25-year model.

The 15bp Spread: What the Data Shows in 2026

The 15 basis point spread isn’t a fixed number — it’s the average gap across the market, and it’s been widening. RBA data from the December 2025 Financial Stability Review noted that the average comparison rate spread for OO P&I variable loans across the Big Four banks had moved from 11bp in 2023 to 15bp in late 2025.

Here’s a snapshot of actual spreads as of May 2026 for basic variable OO P&I products:

Rates sourced from lender product pages, May 2026. All rates for OO P&I, LVR ≤ 80%, $400k+ loan.

Two things jump out from this table:

1. Non-bank lenders compress the spread. Athena’s 10bp gap reflects a genuinely low-fee structure — no application fee, no annual fee, no valuation fee. Macquarie’s 12bp spread is similarly tight.

2. Package deals inflate the spread. CBA’s 17bp gap and ANZ’s 16bp gap partly reflect the annual package fee ($395–$395) being amortised over the small $150,000 model loan — which disproportionately widens the comparison rate relative to a real-world $600,000 mortgage.

That second point is the comparison rate’s biggest limitation, and it’s where I spend a lot of time recalibrating for clients.

Why the Comparison Rate Can Mislead on Larger Loans

The $150,000 model loan is a legacy assumption from 2003 when the legislation was drafted. The average new OO home loan size in Australia, per ABS Lending Indicators December 2025, was $641,000. That’s more than four times the comparison rate model.

When you scale a fixed-dollar annual fee across a larger loan, its impact on the effective rate shrinks dramatically.

Example: $395 annual fee on different loan sizes

A $395 annual fee adds roughly 26bp to the effective rate on a $150,000 loan — but only about 6bp on the average new loan of $641,000. That means the comparison rate overstates the true cost of a fee-heavy loan for most borrowers and understates it for someone borrowing under $200,000.

I tell clients borrowing above $500,000 to mentally subtract 8–12bp from the comparison rate spread when evaluating package loans. For loans under $250,000, add 5–8bp — the fees genuinely bite harder.

Fixed vs Variable: Where the Spread Gets Tricky

Comparison rates on fixed-rate loans add another layer of complexity. The comparison rate formula assumes the fixed rate reverts to the lender’s standard variable rate (SVR) at the end of the fixed period — and the SVR is almost always significantly higher than the fixed rate.

Westpac Fixed Rate Example (May 2026)

The comparison rates on these fixed products look terrible — 83–89bp above the headline rate. But that’s because the formula assumes you spend 23 years on the SVR (currently 7.24% for Westpac) after your 2-year fixed term ends.

In reality, most borrowers either refinance or renegotiate at the end of the fixed period. The comparison rate on a fixed loan is useful for comparing one fixed product against another fixed product with the same term, but it’s nearly useless for comparing a fixed loan against a variable loan, or for understanding your actual cost over the fixed period.

How Lenders Use the Comparison Rate to Frame Products

Lenders know the comparison rate formula inside out, and they structure products to game it — or to differentiate. Here are three patterns I track:

1. Fee-heavy lenders lean on the headline rate

A lender with a $395 annual package fee and a 6.04% headline rate markets the 6.04% aggressively, knowing the comparison rate (6.21%) looks less competitive. The strategy: hope borrowers fixate on the headline number.

2. Low-fee lenders push the comparison rate

Athena, Unloan, and similar online lenders with zero ongoing fees quote the comparison rate prominently because it equals or nearly equals the headline rate. When your comparison rate is 5.99% against a headline rate of 5.89%, you’ve got a clean story to tell.

3. Introductory/honeymoon rates inflate the spread

A 12-month discounted variable rate of 5.49% with a comparison rate of 6.35% tells you exactly what’s happening: after 12 months, you revert to a much higher SVR, and the comparison rate bakes that in. ASIC’s Regulatory Guide 234 specifically requires comparison rates on honeymoon products to reflect the post-honeymoon SVR for the remainder of the 25-year term.

Comparison Rate vs Real-World Cost: A Worked Example

Let’s run the numbers on a real scenario to show where the comparison rate works and where it breaks.

Scenario: Owner-occupier, $600,000 loan, 30-year term, P&I repayments

Option A: CBA Wealth Package Variable

• Headline rate: 6.04%
• Comparison rate: 6.21%
• Annual fee: $395
• Upfront fees: $0 (application fee waived under current offer)

Option B: Athena Variable Home Loan

• Headline rate: 5.89%
• Comparison rate: 5.99%
• Annual fee: $0
• Upfront fees: $0

Option C: Macquarie Basic Variable

• Headline rate: 5.99%
• Comparison rate: 6.11%
• Annual fee: $0
• Upfront fees: $0 (valuation + settlement included)

The comparison rate spread between CBA and Athena is 22bp (6.21% vs 5.99%). But the actual Year 1 effective rate spread on a $600,000 loan is also 22bp (6.11% vs 5.89%) — because the $395 annual fee on $600,000 adds roughly 6.6bp, close to what the comparison rate model implied.

The comparison rate actually did its job reasonably well here. The gap between headline and comparison rate correctly signalled that CBA’s fee structure adds real cost, and the magnitude was directionally accurate even at the larger loan size.

But change the loan to $1.2 million, and the effective spread shrinks to 18bp because the $395 fee becomes a rounding error. Change it to $200,000, and the effective spread blows out to 28bp. The comparison rate’s accuracy is loan-size dependent, and that’s the nuance most rate comparison tables don’t capture.

5 Questions I Use to Cut Through the Noise

When a client walks in with three rate quotes and wants to know which is cheapest, I run through this checklist:

1. What’s the comparison rate spread? If it’s under 12bp, the loan is genuinely low-fee. If it’s over 20bp, there’s a meaningful fee load.

2. What’s your actual loan size? Scale the annual fee against your balance. A $395 fee on $800,000 is 5bp — negligible. The same fee on $180,000 is 22bp — material.

3. Are you getting offset? Offset accounts often carry a package fee. If you’ll use offset heavily, the interest saved usually dwarfs the fee. If you won’t, a no-frills loan with a lower comparison rate might be better.

4. Fixed or variable? If fixed, ignore the comparison rate for absolute cost and only use it to compare against other fixed products with the same term.

5. What’s the post-honeymoon SVR? If you’re looking at a discounted introductory rate, the comparison rate is your warning light. A wide spread means a steep reversion.

Data Note

Interest rates and product features in this article are as of May 2026, sourced from each lender’s official product pages. The 15bp average spread figure draws on RBA Financial Stability Review data (December 2025). Average loan size data is from ABS Lending Indicators (December 2025 release). Comparison rate methodology is prescribed under the National Consumer Credit Protection Act 2009 and ASIC Regulatory Guide 234. Rates and fees change frequently; verify current figures with the lender before applying.

FAQ

Q: Is a lower comparison rate always better?

Not necessarily. A loan with a 5.99% comparison rate and no offset account might cost you more in net terms than a 6.15% comparison rate loan with a fully functional offset if you keep significant savings in the offset. The comparison rate doesn’t account for offset benefits — it only captures costs, not features that save you money.

Q: Why is the comparison rate on fixed loans so much higher than the headline rate?

Because the formula assumes you revert to the lender’s standard variable rate (SVR) after the fixed period ends and stay there for the remaining 20+ years. SVRs are typically 150–200bp above fixed rates, which inflates the comparison rate. If you plan to refinance or renegotiate at the end of the fixed term, the comparison rate overstates your actual cost.

Q: Can I use the comparison rate to compare loans from different lenders?

Yes — that’s exactly what it’s designed for. It’s most reliable when comparing two variable-rate loans with similar features. It’s less reliable when comparing fixed vs variable, or when comparing loans with very different offset/redraw functionality. Use it as a starting point, not the final word.

Q: Does the comparison rate include LMI?

No. Lenders Mortgage Insurance is explicitly excluded from the comparison rate formula because it’s not a lender fee — it’s a premium paid to an insurer. If you’re borrowing above 80% LVR, the LMI cost can be $8,000–$20,000, and the comparison rate won’t reflect any of it. You need to factor LMI in separately.

Q: How often do comparison rates change?

Whenever the headline rate or the fee structure changes. If a lender raises its variable rate by 25bp, the comparison rate typically moves by a similar amount. If a lender increases its annual package fee from $395 to $420, the comparison rate will edge up slightly to reflect the higher fee amortised over the $150,000 model.

The comparison rate is a useful tool, but only if you understand the $150,000/25-year model driving it and how it scales to your actual loan size. If you’re comparing three or four loan options and want someone to run the real numbers against your specific borrowing scenario, feel free to reach out to my team.

Disclaimer: This article is general information only and is not personal financial, tax, legal or credit advice. Interest rates and loan product terms are sourced from each lender’s official product pages (see the data note above for the as-of date). Arrivau Pty Ltd (ABN 81 643 901 599) acts as an ASIC Credit Representative (CRN 530978) under its licensee. Speak to a licensed professional before acting on anything discussed here.