I_Invest, it sounds like you are thinking that losses do not carry over into future years. That is not true.
On schedule D, both long term and short term losses carry over. If you have gains of $40,000 in 2012 and losses of $100,000, your have a net loss of $60,000. On your 2012 return, you can take a net loss of $3,000 for 2012 and the other $57,000 will carry over into 2013 and future years to cancel out gains.
If you think a stock is going to go down, you should sell. If you do not believe me, just ask a tax person or read the rules on capital loss carryovers.
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