Table of Contents 1. A brief explanation of tax filing 2. When is the filing period for 2021 tax filing? 3. Summary of key points for 2021 tax filing 3.1 Reduction of employment income deduction 3.2 Review of basic deduction for high-income earners 3.3 Deduction amount for special deduction for blue return filers ... Read more [2021 filing deadline extended!] We have summarized the key points of tax filing in an easy-to-understand way!