The ANZ could potentially lose 30 to 40 per cent of its National Bank customers by dropping the brand, a banking expert says.

But the bank says it has not had any "appreciable change" in customer numbers since it made the announcement last month and it plans to grow market share.

Massey University senior lecturer Claire Matthews said past bank brand mergers in New Zealand showed a loss of customers was likely, although it could take several years.

Matthews said Westpac experienced a large jump in its share of the home loan market after it absorbed the Trust Bank brand.

Should the National Bank become ANZ? Here is the latest selection of Your Views:

  1. your views
  2. Chris Greyling says
    "They are all part of a cartel anyhow, ripping of kiwis and sending the profits offshore."
  3. YWALK says
    "With these ever changing economic times one bank is inevitable to stand the test of time. I'm happy with the change and hope service delivery would change to be even better!"
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