“자세히 보니 데이트레이딩 해서 워시세일 인정안되는 로스로나오는데요. 어떻게 해야하나요?”---->Then, I guess you do get to claim the loss just not now. Although the loss can't be claimed on a wash sale, the disallowed amount is added to the cost of the repurchased stock. So, the loss can be claimed when it is finally disposed of, other than in a wash sale later.Yoir loss sale is when you sell your stock for a loss. The sale must be either 30 days prior to or 30 days after you buys the same stock; you ALSO obtain the same stock; you obtaina a contract to purchase the same stock; or you obtain the same stock in your IRA or retirement plan. So, you must report wash sales on Form 1040 Schedule D and Form 8949.