Under the Article 73 of the Civil Servants Election and Recall Act [zh], if any positions become vacant due to resignation or election to another office, and the vacated term is longer than one year, a by-election shall be completed within three months commencing from the date of resignation.

[2] On 5 December 2014, the Central Election Commission announced that by-elections for Taichung 6 and Changhua 4 were to be held on 7 February 2015.

[7] Kuomintang called in head of Gongguan Township Hsu Chih-jung [zh] to contest the seat.

[10] KMT called in Deputy Secretary-General of the Executive Yuan Hsiao Chia-chi to contest the seat.

[12] Former Changhua County councillor Hung Li-na announced her bid as an independent after leaving the KMT.

Former Executive Yuan advisor Huang Chao-chan [zh] had also expressed interest in running, but the DPP nominated Liao after comparing results from hypothetical head-to-head polling.