我的理解是賣前30天內,或賣後30天內買同一種,如果loss,就trigger了wash sale。
What Is a Wash Sale?
A wash sale is a transaction in which an investor sells or trades a security at a loss and purchases "a substantially similar one" 30 days before or 30 days after the sale.1 This is a rule enacted by the Internal Revenue Service (IRS) to prevent investors from using capital losses to their advantage at tax time. The wash sale rule applies to stocks, contracts, options, and all other types of securities and trading.