There is no restriction on the types of business that may be undertaken as long as the proposed activities are permissible under the Singapore law. However, there are some activities that require special licenses from the government agency responsible for regulating the specific industries e.g. banks, insurance, fund management companies, private schools and travel agents.
Special import licences are required if the Singapore government categorises a particular product as being a threat to the general health, security, safety or social decency e.g. tobacco and tobacco products, liquor and cosmetics.