Njk-
At the end of the year your brokerage, Note the root word "broker" meaning more broke, should give you a statement of realized gains and losses. If you have realized gains- sold stock this year for a profit, then it is best to dump all the losers in order to reduce your profit. Obviously, if you are holding a profitable stock it is best not to sell at years end and best to hold to qualify as long term cap gains.
I'm not sure how short term cap losses relate to long term cap gains.
I'm not sure of the carry over losses, but like fink was saying I think you can only take a percent per year of your saved up losses against your current year gains.
I know that when I see my short term gains my excitement is quickly dashed by the thought of how much I made for the government. I didn't see them risking their capital and spending hours on this stuff. And not even a thank you card.
Shak- what if I'm having an online affair with my broker?
Pablo