Authorised deposit-taking institutions are being highly selective in the way they pass on cash rate increases to savers, according to comparison site Canstar.

Some of the activity it has seen includes savings rate increases offered on introductory rates but not made available to existing deposit holders.

Sometimes the ADI will put up the rate on one but not all of its savings accounts. Some ADIs have raised rates only on app-based accounts.

Canstar chief executive financial services, Steve Mickenbecker said base savings rates have gone up by an average of 85 basis since the RBA started increasing the cash rate (which has gone up by 175 bps).

“A headline 50 bps increase can mean no increase for some savers,” Mickenbecker said.

During the week to 15 August, 11 ADIs increased savings rates. The top at-call rate is 3.1 per cent, which ING is offering as an ongoing bonus rate of Savings Maximiser and Macquarie Bank is offering as a four-month introductory rate on its savings account.

Bank of Queensland is offering 3 per cent for customers aged 14 to 35 who deposit A$1000 into a linked transaction account and make five transactions a month.