If you are living overseas and would like to vote, you may apply to do so at any of the 10 designated overseas polling stations.

To qualify as a voter, you would need to be a Singapore citizen who is at least 21 years old, have your name in the register of electors, not be disqualified from being a voter, and have stayed in Singapore for at least 30 days between 1 February 2012 and 31 January 2015.

Registration will be suspended once the Writ of Election is issued. You can apply for registration via eServices, or by submitting a completed and signed Application to be Overseas Elector Form, by post or fax, to the Elections Department or to any of the 10 overseas registration centres.

Those who have successfully applied to vote overseas will receive an official notification from the Elections Department with information of their assigned overseas polling stations.

Source: ELD

This article is accurate as of Aug 2015.