So far from the recurring 6.8% smart save promotion, it has the TnC of the top up amount from start of promo period that shall be entitled for the 6.8%,
That said, if you are in a previous promo in Feb 1st to Apr 1st, It would be better to exit & encash few days prior to Apr 1st. Cos if the new promo starts, it will be from Apr 1st.
If you have intentions to continue enrol in the new 6.8% promo, have to do this.
If u allow the previous amount to run beyond Apr 1st, then in order to enjoy the new one, u have to top up additional amount into the acct, on top of existing. The existing amount will not be able to withdraw else top up amount be affected.
Correct me if am wrong in my understanding.