SORA has replaced the Singapore Interbank Offered Rate (SIBOR) and Swap Offer Rate (SOR) as the key interest rate benchmark for Singapore dollar (S$) interest rate contracts.
Published by the Monetary Authority of Singapore (MAS) since 1 July 2005, SORA is a robust and transparent benchmark anchored on actual market transactions and underpinned by a deep and liquid overnight interbank funding market. It is determined based on the volume-weighted average rate of borrowing transactions in the unsecured overnight interbank Singapore dollar cash market in Singapore between 8.00am and 6.15pm.
SORA is published as a daily rate and a series of 1-month, 3-month and 6-month compounded rates on the MAS website. The Compounded SORA rates are calculated as the compounded average of daily SORA readings over the relevant 1-month, 3-months or 6-months periods before each publication date, reducing the effects of rate volatility.