Say I have a stock position that is currently significantly underwater. At this point, I'd like to give up on the stock and sell it. I realize that the resulting capital loss would be deductible on my income taxes (up to $3,000 per year). However, due to my tax situation, I would like to defer booking the loss until 2020.
If I sell the stock now, am I required to claim (at least the first $3,000 of) the capital loss on my 2019 return, or can I carry over the entire loss to a future year? If I could defer it, then I might sell the stock now (to avoid it going down further).