The CECC stated that it would tighten home quarantine measures for travelers entering Taiwan starting from January 15, 2021. Apart from the original requirement of providing a COVID-19 RT-PCR test report issued within three days of boarding, arriving travelers shall also provide proof of the place of quarantine where travelers stay to undergo quarantine (in principle, the place shall be a group quarantine facility or quarantine hotel; those who choose to undergo quarantine at home shall make an affidavit to declare they have met the requirement of one person per residence). Entry quarantine measures will be adjusted on a rolling basis depending on the status of the pandemic and implementation of those measures. 

(News link)