The Singapore Standard Industrial Classification (SSIC) is a four-digit number that tells local authorities what a Singapore company’s primary source of revenue is. It is used by the Singapore government to analyse economic activity. Singapore uses the SSIC for its population, household, and industry censuses. Companies are required to register for the SSIC code, which is based on the internationally recognized standard for classification of all economic activities (ISIC). The SSIC code is purely administrative, and the registering company is not liable for additional reporting or tax. Data are collected by Singapore government bodies under the SSIC code for taxonomy purposes, such as compiling, presenting, and analysing current economic structures.