The wash sale rule disallows a loss on the sale of a security. Generally, for many taxpayers, it gets triggered when you sell a security at a loss and then re-purchase the same security, or a similar security, within 30 days. If that happens, the loss that you realized when you sold the security gets added back to the cost basis of the purchase that triggered the wash sale. If you want to realize the loss, then don't re-purchase the same or similar security within 30 days after a sale that results in a loss.
Does your 1099-B reflect whether a particular trade was a wash sale? Remember, the wash sale only disallows losses. In effect, it increases gains because when you disallow losses, that tends to increase gains. And it only applies to losses. If you had a gain and then later repurchased the same or similar security, no matter when you made your purchase, the wash sale rule does not apply.
@amanmarwah
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