 To be eligible to vote at a contested election in any constituency , a voter 's name must be on the latest certified register of electors for that constituency . The name of the voter will be included in the register of electors for a constituency if on the cut @-@ off date for the production of the register of electors the voter is a citizen of Singapore , at least 21 years old , and ordinarily resident or deemed to be ordinarily resident in Singapore at an address that is in that constituency . For the purpose of preparing or revising a register of electors , information stated on a voter 's National Registration Identity Card is used to determine that he or she complies with the above requirements , unless the facts are shown to be otherwise . 
