Commonwealth Bank chief executive Ian Narev says bank customers are taking advantage of rate cuts to to pay off their mortgages faster, rather than reducing their repayments.

Mr Narev, speaking to reporters after CBA's annual general meeting in Sydney on Tuesday, said he could not comment on future interest rate moves.

But he said the bank had found customers did not use rate cuts to reduce their immediate home loan costs.

"That isn't a question of whether you pass on 25 basis points, 20 or 18, that is a function of what individuals are choosing to do, which is to accelerate repayment of debt," Mr Narev said.

He also said he had confidence in the Reserve Bank's decisions on rates, and was not concerned that recent cuts had not translated to a boost in economic activity.