madtari, sorry if i dun have the patience to figure out your calculations as we dun have the full picture. we are here to learn from each other, verify our calculation is correct and proceed with the right informed decision. there is no need to get upset with each other. the below is a wall of text but i hope it gives some clarity. i didnt bother on the tnc on those 0.5-1% accounts as i'm not into it, but i think u can probably do without them unless u really hate even moderate hassle then stick to cimb.
in my and many other people's cases, it is just about maximising each month's maximal interest up to the quota provided by the banks, and these are further limited by number of salary crediting and card spending which varies among all of us. the rest is best done on excel with (interest pa) * (no of days/365) * (amt), so u varies the combination of interest pa and amt of each account and see which fits you the best.
the market best bet is boc, but a lot of us dun use it cos there are enough hassles and we dun wan more. to put things simply, this is my current way and u see if it suits you.
i have 2 salary credited into 2 ocbc 360. i dun spend on ocbc cc anymore. my other cc statements ends mostly on 2nd of each month and i clear all of my cc bill (at least 6) via ocbc online banking to fulfill girobill requirement at the start of each mth so that i wont forget to pay bills.
in even months (30 days), i withdrew all from ocbc except one of the account i kept 3k to avoid fall below fee. all these money goes to uob hya at 1.6-1.7% round to the nearest 10k. the small changes goes to scb esaver at least 1.4% which i use for most active transactions. i have 3 esaver accounts and i ensure that 2 of them have no positive balance in the odd months, so they are always incremental from zero. that gives me about 1.6+ % overall, with ocbc giving minimal interest on that 3k.
in odd months (31 days), i transfer in both ocbc accounts to hit 60k each. that will give me 2.75% on one account (1.2 + 0.5 + 0.05 + 1%) and close to 2.7% (1.75% on 3k and 2.75% on 57k) on the other account that have 3k always. the rest remains in hya/esaver.
aside from this, i had 1 uob one account getting 2.43% on 50k. now i am setting 2nd uob one account with 3 giro. that's another complicated story which u can ignore tentatively.
in short,
1. for that 120k under ocbc 360, i get
even months: 1.6 + % mostly in other accounts
odd months: 2.725% in ocbc
average out is 2.17%, better than 2.08% if i credit my salary to dbs multiplier.
2. for the rest of the money, depending on your eligibility for the various accounts, you can get at least 1.4% every month provided that u make sure at the start of each promotion they start from zero balance the month before.
anyone had better advices on improving my saving strategy, do advice so. there are a lot of intelligent people here who know much more and are far more diligent.