The Wash Sale With the wash-sale rule, the IRS disallows a loss deduction from the sale of a security if a ‘substantially identical security' (defined below) was purchased within 30 days before or after the sale. The wash-sale period is actually 61 days, consisting of the 30 days before and the 30 days after the date of the sale. For example, if you bought 100 shares of IBM on December 1 and then sold 100 shares of IBM on December 15 at a loss, the loss deduction would not be allowed. Similarly, selling IBM on December 15 and then buying it back on January 10 of the following year does not permit a deduction. The wash-sale rule is designed to prevent investors from making trades for the sole purpose of avoiding taxes.
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