It's great that Bangulzai has written this series on SGS bonds.
They are almost risk-free, but it's also important to understand
what exactly are the remaining risks that investors should know
about.
One important aspect to consider, for example, is the potential
for the SGS bond's price to change as time passes or when interest
rates move up (as pointed out by Charlize). This means that
selling the SGS bond before it "matures" will expose you to some
risk. "Matures" refers to the date where the Singapore government
is obliged to return the original investment back to you based
on the "face value" of the bond. Before maturing, the government
would also have paid you interest every 6 months for "borrowing"
money from you.
Agree with Lianamaster that some of the SGS bond terms can be
chim. Over at CashBench, there is a two-part
series on SGS Bonds that will cover all the important aspects
& terms that you need to know before investing. You can then
decide if it's an appropriate investment for yourself. Links as
follows: