As of June 2022, it was the seventh largest bank in New Zealand, with a market share in terms of assets of 1.4%.

At the time the bank's accountant was paid an annual salary of £20, so the deposit was a considerable sum.

In 1975, Taranaki Savings Bank was the first bank to offer free, interest-bearing cheque accounts and in 1981 the bank pioneered New Zealand's ATM Cashflow network with one ATM installed in each of the Hāwera, Fitzroy, New Plymouth City and New Plymouth City Centre (now TSB Centre) branches.

[8] In late August 2024, the Commerce Commission fined TSB Bank nearly NZ$2.5 million for overcharging customers about NZ$3.6 million through unreasonable credit and default fees between 2015 and 2021.

TSB blamed system failures for the overcharging and said it had compensated affected customers.