What are the interest rates of return for Nikko AM STI ETF and ABF Singapore bond index fund respectively?

The future investment returns on the funds depend on performance of underlying assets so it is not really "interest" like you get from a bank/bond which would be fixed at outset.

Anyway - if you are interested, the historical investment returns can be found here: https://sg.finance.yahoo.com/quote/G3B.SI/perfo... https://sg.finance.yahoo.com/quote/A35.SI/perfo... Do also note for something like the STI ETF - its objective is to track the index; so a low return number doesn't mean a crap manager (or high return mean a good manager). The return is just reflective of what the STI is doing.