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Westpac Altitude Black vs ANZ Rewards Black vs CBA Diamond Plus in 2026: The Premium Card Choice Before the RBA Cap

Ziling Liu
Ziling Liu
Personal Finance Editor, ShopBack
Westpac Altitude Black vs ANZ Rewards Black vs CBA Diamond Plus in 2026: The Premium Card Choice Before the RBA Cap

Ahead of the RBA interchange cap on 1 October 2026, three Australian premium credit cards sit at the top of the sign-up bonus and earn-rate stack: Westpac Altitude Black (Amex plus Visa/MC combo, Qantas or Altitude Rewards), ANZ Rewards Black (Asia Miles alignment, largest recurring bonus), and CBA Ultimate Awards or Diamond Plus (Velocity flexibility, strongest earn on international spend). Sign-up bonuses tell you which is worth committing to before the cap resets earn rates.

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