Parliamentary elections in Singapore must be held within three months after five years have elapsed from the date of the first sitting of a particular Parliament of Singapore. However, in most cases Parliament is dissolved and a general election called at the behest of the Prime Minister before the five-year period elapses. The number of constituencies or electoral divisions is not permanently fixed by law, but is declared by the Prime Minister prior to each general election pursuant to the Parliamentary Elections Act (Cap. 218, 2011 Rev. Ed.), which governs the conduct of elections to Parliament, taking into account recommendations of the Electoral Boundaries Review Committee. For the 2015 general election, there were 89 seats in Parliament organised into 13 Single Member Constituencies (SMCs) and 16 Group Representation Constituencies (GRCs). Each SMC returns one Member of Parliament while each GRC returns between three and six MPs, at least one of whom must be from the Malay, Indian or other minority communities. A group of persons wishing to stand for election in a GRC must all be members of the same political party, or a group of independent candidates. The voting age in Singapore is 21 years.
The election process begins when the President, acting on Cabinet's advice, issues a writ of election addressed to the returning officer. On nomination day, the returning officer and his or her representatives will be present at designated nomination centres between 11:00 am and 12:00 noon to receive prospective candidates' nomination papers, and political donation certificates certifying that they have complied with the requirements of the Political Donations Act (Cap. 236, 2001 Rev. Ed.). A person intending to contest in a GRC as a minority candidate must also submit a certificate confirming that he or she is a person belonging to the Malay, Indian or some other minority community. In addition, between the date of the writ of election and 12:00 noon on nomination day, candidates must lodge with the returning officer a deposit equal to 8% of the total allowances payable to an MP in the preceding calendar year, rounded to the nearest $500. For the 2015 general election, the amount of the deposit was $14,500. At the close of the nomination period, where there is only one candidate in an SMC or one group of candidates in a GRC standing nominated, the election is uncontested and the returning officer will declare that the candidate has or the group of candidates have been elected. Where there is more than one candidate in an SMC or more than one group of candidates in a GRC, the election is adjourned for a poll to be taken. The returning officer issues a notice of contested election which states when polling day will be; and information such as the names of the candidates, their proposers and seconders, the symbols allocated to candidates which will be printed on ballot papers, and the locations of polling stations.