You are talking about tax loss harvesting,
sell losers so you won't have to pay tax on winners.
day traders can be impeded in this strategy because of the wash sale rule
you may sell at a loss but the loss cannot be deducted because your prior activity makes it is a wash sale.
if you sell and then buy back, trying to trick the IRS, you will definitely have a wash sale.\
You can buy back only after waiting thirty-one days.
@vrobert
