Two distributions, two balances
A Sacco dividend is paid on share capital, which is your ownership stake in the co-operative and is generally not withdrawable while you remain a member. Interest or a rebate is paid on member deposits, which is the balance that accumulates with your contributions and that your borrowing is measured against.
They are declared separately at the annual general meeting, usually at different rates, and they are not interchangeable. This is the single most common misunderstanding about Sacco returns.