hi guys, so now my MBB flexi mortgage account is up, bank has disbursed money to the vendor and i will need to pay instalment very soon.

Let's say now i have extra money and thinking to park the money in the bank to lower down the interest, what should i need to do? ie where to park the money, do i need to notify the bank etc.

Let's say my loan amount is 300k, i parked 50k,

1. interest calculation is based on 250k right?
2. the 50k is treated as principal reduction or interest advance payment?