How is the national electoral register created?

Taiwan, Central Election Commission, Characteristics of Taiwan Elections, accessed 19 January 2020

1. Electors do not have to actively register to vote

Taiwan has a comprehensive household registration system. The compilation of the voter list/electoral register is handled by the Household Registration Offices 20 days prior to the Election Day. Hence, citizens do not have to actively register to vote, with the exception of citizens residing overseas during the Presidential and Vice Presidential election.