Here are the monthly interest for exactly $60k monthly average effective balance deposit in BOC SmartSaver a/c:
Prevailing Interest (0.4%) - $60,000 * (0.004/365*no. of days)
[note: balance over $60k get Prevailing interest too, but not Bonus interest]
Calendar month with 30 days=$19.73
Calendar month with 31 days=$20.38
[Prevailing Interest credited on last day of each Calendar month]
3 Bill Payment Bonus Interest (0.35%) - $60,000 * (0.0035/365*no. of days)
Calendar month with 30 days=$17.26
Calendar month with 31 days=$17.84
Salary $2k Bonus Interest (0.8%) - $60,000 * (0.008/365*no. of days)
Calendar month with 30 days=$39.45
Calendar month with 31 days=$40.77
Salary $6k Bonus Interest (1.2%) - $60,000 * (0.012/365*no. of days)
Calendar month with 30 days=$59.18
Calendar month with 31 days=$61.15
Credit/Debit Card spent $500 Bonus Interest (0.8%) - $60,000 * (0.008/365*no. of days)
Calendar month with 30 days=$39.45
Calendar month with 31 days=$40.77
Credit/Debit Card spent $1,500 Bonus Interest (1.6%) - $60,000 * (0.016/365*no. of days)
Calendar month with 30 days=$78.90
Calendar month with 31 days=$81.53
Extra Savings Interest - Enjoy 0.60% p.a. Extra bonus interest when you have fulfilled at least one of the requirements for either Card Spend, Salary Crediting or Payment bonus interest. Payment bonus is applicable to your account balance above S$60k subject to a maximum of S$1m
Example – Calendar month of 31 days :
Prevailing interest =$20.38
Meet 3 bill payment => $17.84
If have Salary $6k => $61.15
If credit card spent $1,500 => $81.53
Total Bonus interest = $160.52
Total interest = $180.90 (include Prevailing interest)