The sixth supplementary elections for the National Assembly and Legislative Yuan were held in Taiwan on 6 December 1986.
[1] Compared with the last supplementary election (1980 for the National Assembly and 1983 for the Legislative Yuan respectively) the number of eligible seats for the National Assembly had been increased from 76 to 84 and for the Legislative Yuan from 98 to 100 due to an increase in population.
Of these, 73 seats for the Legislative Yuan represented Taiwan Province and the special municipalities of Taipei and Kaohsiung and were to be elected directly.
The remaining 27 seats for the Legislative Yuan represented overseas nationals and were appointed by the President.
Turnout for the supplementary election of the National Assembly was 65.1% and for the Legislative Yuan 65.4%.