A wash sale is a transaction where an investor sells a security at a loss and repurchases the same or a substantially identical asset within 30 days, preventing the investor from claiming an immediate tax deduction on that sale.
Understanding the wash sale rule
Tax authorities restrict this practice to prevent investors from artificially generating tax write-offs while maintaining their position in an asset. When an investor realizes a loss on a security, they might want to buy it back quickly to capture a future recovery in the stock price. Regulations stipulate a window of time before and after the sale during which repurchasing the asset nullifies the tax deduction.
The term “wash sale” and the specific 30-day window are features of the United States tax code managed by the Internal Revenue Service. Other countries enforce related regulations to achieve the same result. The United Kingdom restricts this trading behavior under “bed and breakfasting” rules. Canada applies “superficial loss” rules for asset repurchases made within 30 days. Australia applies general anti-avoidance rules to cancel tax benefits from wash sales. Elephants trading outside the US should review their local jurisdiction regarding exact timeframes and terminology.
When a wash sale is triggered, the disallowed loss is added to the cost basis of the newly purchased shares. This mechanism defers the tax benefit rather than canceling it completely. The investor will realize the loss when they eventually sell the replacement shares in a transaction that does not trigger another wash sale. The holding period of the original asset is also carried over to the newly acquired shares.
Example
Suppose an Elephant investor buys 100 shares of a watering hole supply company at $50 per share. The stock price declines to $30 per share later in the year. The Elephant sells the 100 shares, recording a loss of $2,000. Fifteen days later, the Elephant sees the market recovering and buys 100 shares of the exact same company at $32 per share.
Because the Elephant repurchased the shares within the restricted 30-day window, the transaction is a wash sale. The Elephant is barred from deducting the $2,000 loss on their tax return for that year. The $2,000 loss is instead added to the $3,200 purchase price of the new shares. The Elephant now has a cost basis of $5,200 for the new position.