Are you asking how to write-off a stock investment that has 'gone to zero'? I'm pretty sure you a) tell your broker to 'abandon' the position (that isn't necessarily the right term), and b) when you itemize your taxes, you declare the loss (though, sometimes you have to spread out a loss over time, depending on how large it is; but that may depend on whether you also have capital gains in the same year; consult your accountant [insert appropriate face icon]).
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