case 1 contribution to cpfSo it's not entirely correct to say that interest is computed based on the lowest balance in the month![]()
1 jan opening balance 10k
10 jan receive 1k into account. total balance 11k
31 jan closing balance 11k
1 k received no interest. so interest only on 10k so lowest balance is correct.
case 2 withdrawal from cpf
1 jan opening balance 10k
10 jan withdraw 1k into account. total balance 9k
31 jan closing balance 9k
1 k received no interest. so interest only on 9k so lowest balance is correct.
case 3 withdraw then contribute
1 jan opening balance 10k
10 jan withdraw 1k into account. total balance 9k
20 jan contribute 1k into account. total balance 10k
31 jan closing balance 10k
withdrawal and deposit receive no interest received no interest. so interest only on 9k so lowest balance is correct.
case 4 contribute then withdraw
1 jan opening balance 10k
10 jan receive 1k into account. total balance 11k
20 jan withdraw 1k. total balance 10k
31 jan closing balance 10k
withdrawal and deposit receive no interest received no interest. so interest only on 9k so lowest balance is wrong.

Cannot make it guy like me, wouldn't dump a dollar into T-bills unless I am dumb or it's about time to heck OA and SA or the T-bills are giving more than the current 3.32%. 4% is more palatable, if using CPF.