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How Do I Calculate Wash Sale Loss for My Investments?

How Do I Calculate Wash Sale Loss for My Investments?

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James Whitaker
July 9, 2024
Navigating the world of investments can be complex, especially when it comes to understanding tax implications. One such concept that often causes confusion is the wash sale rule. This rule, designed to prevent investors from manipulating losses for tax purposes, can significantly impact your tax liability. Understanding how to calculate wash sale losses is crucial for maximizing your investment returns and minimizing your tax burden. This article will guide you through the process, providing a clear and concise explanation of the wash sale rule and its implications.

Understanding the Wash Sale Rule

The wash sale rule, a provision of the Internal Revenue Code, disallows the deduction of losses on the sale of securities if you repurchase substantially identical securities within 30 days before or after the sale. This rule applies to stocks, bonds, mutual funds, and other securities. The purpose of the wash sale rule is to prevent investors from artificially creating losses to offset capital gains, thereby reducing their tax liability.

Identifying a Wash Sale

To determine if a sale constitutes a wash sale, you need to consider the following factors:
Substantially Identical Securities: The securities sold and repurchased must be substantially identical. This means they have the same issuer, same class, and same rights. For example, selling shares of Apple Inc. stock and buying more shares of Apple Inc. stock within 30 days would be considered a wash sale.
30-Day Window: The repurchase must occur within 30 days before or after the sale. This window includes the day of the sale and the day of the repurchase.
Loss on Sale: The sale must result in a loss. If you sell securities at a profit, the wash sale rule does not apply.

Calculating Wash Sale Loss

If you identify a wash sale, you need to calculate the disallowed loss. This loss is added to the cost basis of the repurchased securities. Here's how to calculate the wash sale loss:
1. Determine the Loss: Calculate the difference between the sale price and the purchase price of the securities sold.
2. Identify the Repurchased Securities: Determine the number of shares or units of the substantially identical securities repurchased within the 30-day window.
3. Calculate the Wash Sale Loss: Multiply the loss from step 1 by the number of shares or units repurchased in step 2.

Example of Wash Sale Loss Calculation

Let's say you sell 100 shares of XYZ stock for $50 per share on January 10th, resulting in a loss of $10 per share. On January 20th, you repurchase 50 shares of XYZ stock for $55 per share.
Loss on Sale: $10 per share x 100 shares = $1,000
Repurchased Securities: 50 shares
Wash Sale Loss: $10 per share x 50 shares = $500
The $500 wash sale loss is added to the cost basis of the 50 shares repurchased. This means the cost basis of the repurchased shares is $55 per share + $10 per share = $65 per share.

Implications of Wash Sale Loss

The wash sale rule can have a significant impact on your tax liability. By disallowing the deduction of losses, it can increase your taxable income and potentially lead to a higher tax bill. It's important to be aware of this rule and take steps to avoid wash sales whenever possible.


Understanding the wash sale rule is crucial for investors seeking to minimize their tax liability. By identifying wash sales and calculating the disallowed loss, you can ensure that you are not inadvertently increasing your tax burden. Remember to carefully consider the timing of your trades and the nature of the securities involved to avoid triggering the wash sale rule.
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