The iBoxx ABF Singapore is designed to measure the performance of SGD-denominated sovereign and sub-sovereign debt issued in Singapore. The index includes bonds with minimum amounts outstanding of SGD 500 million for sovereign bonds, SGD 200 million for sub-sovereign bonds and SGD 150 million for green sub-sovereign bonds. Bonds must have a minimum initial time to maturity of 18 months at issuance and a remaining time to maturity of at least one year at rebalancing. While domestic central government debt does not require ratings, sub-sovereign bonds must be investment grade. Unrated bonds from investment grade markets are eligible if they are government guaranteed or from qualifying financial agencies. The bonds must be domestic and tradable in the local market, excluding offshore currency bonds.