CSO explained that as long as your top up is more than the withdrawal, the difference is treated as fresh funds (for the past two days). subsequently they look at the daily end-day balance to compute interest.
so it depends on how you top up. say if you withdrew $200k and top up $200k, there'll be no fresh funds done. but if you top up $210k after withdrawing $200k, the $10k will be considered as fresh funds. then the next day onwards it'll follow the end-day balance.
I had deposited $x on 1 March.
After knowing that it was not considered fresh funds, I withdrew $x on 3 March.
The CSO then said I can top up $y on 4 March (where y > x), and then on 5 March I can top up $z, so that $(y+z) will be considered as fresh funds on 5 March.
"Top-up SGD xxx today and subsequently tomorrow, top up additional SGD yyy in the account. The total of SGD (xxx+yyy) will be consider as fresh fund on 05/03/2025."
tbh, I'm unclear how it works, but it's something to do with "subsequently will follow the end-day-balance of the account"
yes it's still confusing af.