How often do interest rates on savings accounts change?
There's no set rule for when interest rates change on savings accounts. External factors such as when the RBA announces changes to the Official Cash Rate are taken into consideration when making decisions on changing interest rates on savings accounts.
If you have a term deposit, your interest rate won't change during the fixed term period in which you have your money invested. When your term deposit matures though, your fixed term comes to an end. If you choose to renew for another fixed term, you will need to select the fixed term and interest rate that best suits your needs.