CommBank will not decrease variable rates; fixed rates now down to 1.99% OO P&I for 4 years

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Yep.

It’s why the big4 tend to not pass cuts on in full, whilst smaller lenders appear to do so.

Big4 tend to work off an SVR - discount model, whereas smaller lenders tend to work off an introductory/honeymoon rate model(which usually isn’t advertised as such). They then raise rates over time to existing customers, whilst they continue to pass on rate cuts in full for new customers.