Westpac
5.92%
+0.03%
St George vs Its Westpac Sister Brands: Same Credit Team, Four Rate Cards
St George, Bank of Melbourne, Bank SA and Westpac itself all share the same underwriting team, credit policy and operational back-end. But each publishes its own rate card, each has its own retention team, and each can be 0.05-0.15% cheaper than the others in any given month. Understanding how to shop the four is the whole game for borrowers looking at this group.
Richard Esteb, Licensed Broker (Credit Rep #574071) · Published 17 April 2026 · Live panel data
ST GEORGE
5.89%
cheapest variable
WESTPAC
5.92%
cheapest variable
BANK OF MELB.
5.89%
cheapest variable
BANK SA
5.89%
cheapest variable
ROUND 1
Cheapest variable rate — same starting point for 3 of 4
St George, Bank of Melbourne and Bank SA all list 5.89% as their cheapest variable rate. Westpac itself is 0.03% more expensive at 5.92%. That's not coincidence — Westpac deliberately positions its own-brand product slightly above the subsidiaries so as not to undercut them and trigger the ACCC-mandated brand-separation complaints.
St George
5.89%
Tied cheapest
Bank of Melb.
5.89%
Tied cheapest
Bank SA
5.89%
Tied cheapest
For sub-80% LVR OO P&I through the broker channel on a comparable loan size, you'll see the same 5.89% three ways. The brand choice at this tier is about fit, not price.
ROUND 2
Average rate across the product range — where they quietly diverge
The headline rate is identical but the average rate across each brand's full product range tells a different story. These are the rates the modal customer ends up paying if they don't aggressively optimise.
St George
6.90%
Middle
Westpac
6.89%
Middle
Bank of Melb.
6.84%
Cheapest on avg
Bank SA
6.88%
Middle
Bank of Melbourne is the cheapest on average — by a fraction (0.06% below St George). For a borrower who doesn't want to fight for the sharpest tier, Bank of Melbourne's product range skews marginally friendlier. This is consistent over the 12 months of data I track: BoM typically wins the "average customer" by pennies.
ROUND 3
Investment LVR — where they noticeably diverge
This is where sister-brand differences become material. Bank of Melbourne allows 95% LVR investment with LMI, while St George, Bank SA and Westpac cap investment lending at 90%.
St George
90%
Standard
Westpac
90%
Standard
Bank of Melb.
95%
More generous
Bank SA
90%
Standard
For a thin-equity investor who can't bring 10% deposit, Bank of Melbourne is the only sister-brand door open — despite the 4 brands sharing the same policy overlay on most other dimensions. The origin story: BoM is Westpac's most recently-reorganised subsidiary and carries a slightly different product specification document.
ROUND 4
Turnaround — subtly different despite shared credit team
All 4 brands route through the same Westpac-group credit team, but submission priority and valuer allocation can differ. On our Q1 2026 settlement data:
St George
8 days
Tied fastest
Westpac
8 days
Tied fastest
Bank of Melb.
9 days
Slight lag
Bank SA
10 days
Slowest
St George's own-brand submission portal is slightly better-integrated than Bank SA's, which accounts for most of the 2-day gap. Not usually a deciding factor, but worth knowing if you have a tight settlement.
The sister-brand arbitrage play
Because all four brands use the same credit team, a file that approves at one approves at all four. But each brand prices independently. The practical play: submit your file to a broker who'll run the exact same scenario through the sharpest sister-brand's pricing tool each month. In our experience this adds 0.05-0.15% of rate saving roughly 40% of the time — the other 60% all four brands price identically. Worth doing on any file where the saving is meaningful.
We'll run your file across all four Westpac sister brands
Plus the cheapest 3 alternative lenders on our panel. Find out which brand prices your specific scenario best this month. Quick brief, realistic numbers back.
Run the sister comparisonIs St George the same as Westpac?
St George is a wholly-owned Westpac subsidiary that shares the same underwriting team, credit policy and operational back-end. However, St George publishes its own independent rate card and brand. Same APRA prudential status; same Financial Claims Scheme deposit guarantee.
Which is cheaper: St George or Bank of Melbourne?
Both start at 5.89% variable — identical headline rate. On average across their product ranges Bank of Melbourne is 0.06% cheaper (6.84% vs 6.90%). The pricing gap flips month-to-month based on which brand's retention team is more aggressive.
Can I submit my loan to all 4 Westpac brands?
Not simultaneously — that would constitute multiple applications. A broker will run your scenario through each brand's pricing tool in advance and submit to the sharpest-priced one. Because all brands use the same credit team, the approval likelihood is identical.
Does St George do 95% LVR investment loans?
No. St George caps investment at 90% LVR. For 95% LVR investment within the Westpac group, use Bank of Melbourne.
How fast is St George approval?
Average 8 business days submission-to-unconditional — tied with Westpac as the fastest of the sister brands. Conditional typically 2-3 days on clean files.
Richard Esteb
Licensed Mortgage Broker & Founder
ASIC Credit Rep #574071 · ACN 681 636 056
I price identical files through all 4 Westpac sister brands every week. The arbitrage is real and repeatable. Refreshed 17 April 2026.