I have another question: for 1 stock, i have 3 sales in 2017. first sale, i have disallowed loss, let say, 30$. second sale, the disallowed loss was 10$. should i add first deferred loss 30$ to the basis cost of second sale and makes its deferred loss 40$ (instead of 10$) and then add the 40$ deferred loss to the basis cost of third sale. OR should i let the first 2 sales unchanged, and add total deferred loss to the basis cost of the third sale.
