Just checking for those who redeem SBJUN2022 GX22060F and receive on 03 Oct 2022 your calculation is close? I am using formula 124 / 365 x 143 = 48.58 assume for 10k placement so easier to count. I get 13 cents lesser as the redeemed amount is $10,048.45.
This lead me to think the so called first year at 1.43% , second year 2.41% etc all those are for display with 2 decimal point in reality it is a long floating number with many digits behind the decimal point?
issue date
1-30 June 2022 - 30 days
1-31 July 2022 - 31 days
1-31 Aug 2022 - 31 days
1-30 Sep 2022 - 30 days
1-2 Oct 2022 - 2 days
Total 124 days
Edit:
There is a formula and I find it strange one. Notice that
183?
https://www.mas.gov.sg/bonds-and-bills/investing-in-singapore-savings-bonds/how-to-redeem
AI = (CPN / 2) x (DC / PC) x H
AI = 0.00715 x (124 /
183) x 10000
AI = 48.448 ~= 48.45 <- so I earn a bit instead
AI = Accrued Interest
CPN = Annual interest rate (as percentage) and not more than 2 decimal place
DC = Actual day count from most recent interest payment, but not including next interest payment
PC = Total number of days from most recent interest payment, but not including next interest payment
H = Redemption amount
Edit2:
I think I now know why the 183. Interest supposed to be given on 1 Dec 2022 so from issue date 1 Jun 2022 - 1 Dec 2022 (exclude this day itself) is 183 days. When we redeem our monies only stay inside for 124 days so pro-rate is 124 / 183
CPN / 2 also make sense as the interest payment is paid 2 times a year so if you redeem after the 6th month mark you already take the earlier 6 month interest. When count the accrued interest for the subsequent redemption must remove that else mas rugi