Yes, if you only sell losers this year, the first $3,000 of that capital loss will count against your ordinary income and thus save you the tax on up to $3,000 worth of income at your current marginal tax rate. Then if you sell the stocks with gains next year, you'll first cancel out any capital loss carryover from this year (if you had more than $3,000 of losses) and then will pay long-term capital gains tax on any surplus. Since your capital gains rate is lower than your regular tax rate, realizing the losses in one year and the gains the next can be a good way to save money on your taxes.