I looked into it, and reviewing three years of overseas income isn't quite what I thought. For example, US stocks and Hong Kong stocks are clearly considered overseas income. It's not just about your trading profits and losses; even if your stock holdings are in a loss, the dividend portion must be taxed at 20%. Moreover, even if your trading part is losing money, but you made money from IPOs, your overall profit still needs to be taxed, calculated on an annual basis.