if you believe this stock will rebound, you can sell it, wait 31 days, buy it back.
you will get a tax deduction.
If the stock starts moving up immediately after you sell it (typical) you will miss out on the first month of the rebound. You might have to repurchase fewer shares.
Your tax deduction is your compensation for that risk.
January is usually an up month, especially when December is up, as it is this week,
