Let's say a Day Trader buys and sells a stock on the same day and makes a loss of $1,000. Then she buys and sells the same stock the next day and makes a profit of $500. On the third day she files her taxes.

As I understand the Wash Sales rule, she cannot claim a $500 overall loss on the stock. She will need to declare a $500 profit on the stock. Because she bought a "substantially similar" (identical, actually) stock within 30 days of the loss transaction.

Am I interpreting this correctly? (I hope I'm wrong!)

  • 1
    In the future, please specify a country tag when you ask a question relating to taxes or regulation. Thank you. Commented Aug 28, 2014 at 1:54
  • The wash-sale rule is one of the reasons that some day-traders tend to prefer trading equity futures (which have no wash-sale governance), as opposed to individual stocks. Commented Aug 28, 2014 at 9:15

3 Answers 3


Great question! It can be a confusing for sure -- but here's a great example I've adapted to your scenario:

As a Day Trader, you buy 100 shares of LMNO at $100, then after a large drop the same day, you sell all 100 shares at $90 for a loss of $1,000. Later in the afternoon, you bought another 100 shares at $92 and resold them an hour later at $97 (a $500 profit), closing out your position for the day.

The second trade had a profit of $500, so you had a net loss of $500 (the $1,000 loss plus the $500 profit).

Here’s how this works out tax-wise: The IRS first disallows the $1,000 loss and lets you show only a profit of $500 for the first trade (since it was a wash). But it lets you add the $1,000 loss to the basis of your replacement shares. So instead of spending $9,200 (100 shares times $92), for tax purposes, you spent $10,200 ($9,200 plus $1,000), which means that the second trade is what caused you to lose the $500 that you added back (100 x $97 = $9,700 minus the 100 x $102 = $10,200, netting $500 loss).

On a net basis, you get to record your loss, it just gets recorded on the second trade. The basis addition lets you work off your wash-sale losses eventually, and in your case, on Day 3 you would recognize a $500 final net loss for tax purposes since you EXITED your position. Caveat: UNLESS you re-enter LMNO within 30 days later (at which point it would be another wash and the basis would shift again).

Source: http://www.dummies.com/personal-finance/investing/day-trading/understand-the-irs-wash-sale-rule-when-day-trading/

  • "sell all 10 shares at $90 for a loss of $1,000" I think you mean "sell all 100 shares"
    – Buge
    Commented Mar 9, 2018 at 5:01
  • Great answer! One question to add: do we need to manually adjust the cost basis for the second trade or is it automatically taken care of by most stock brokers?
    – Weipeng
    Commented Jul 15, 2021 at 21:23

You are correct. She cannot claim the initial loss of $1,000 on her taxes, she can only report the $500 profit.

However, the IRS does allow her to add the $1,000 loss to the basis cost of her replacement shares.


  1. Trader buys 100 shares at $100 / share.
  2. Trader sells 100 shares later that day at $90/share. Loss of $1,000
  3. Trader buys 100 shares the next day at $85/share.
  4. Trader sells 100 shares later that day at $90/share. Gain of $500
  5. Trader can add the initial $1,000 loss from #2 to the $8,500 spent in #3, for a total cost of $9,500 and a sale (#4) of $9,000, resulting in a net loss of $500.
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    Faster than I am. :) Here's a nice link with another example: investopedia.com/terms/w/washsalerule.asp
    – Alex B
    Commented Aug 27, 2014 at 20:45
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    irs.gov/publications/p550/ch04.html#en_US_2013_publink100010601 - Example 1 details this
    – Noah
    Commented Aug 27, 2014 at 20:46
  • @Noah Thanks. What's the reason why the IRS would want it this way, but not the other way? (It sounds to me like, regardless, she ends up claiming a $500 loss.) Commented Aug 27, 2014 at 23:23
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    I feel like I will never understand the reasoning behind many of the IRS's rules
    – Noah
    Commented Aug 27, 2014 at 23:27
  • 2
    @user1883050 The reason for this is to prevent someone from selling a stock for a loss near the end of the year and immediately buying it back. The wash sale rule would prevent them from claiming the loss in the tax year in which they sold it.
    – 7529
    Commented Sep 7, 2014 at 4:16

Yes, an overall $500 loss on the stock can be claimed. Since the day trader sold both lots she acquired, the Wash Sale rule has no net impact on her taxes.

The Wash Sale rule would come into play if within thirty days of second sale, she purchased the stock a third time. Then she would have to amend her taxes because claiming the $500 loss would no longer be a valid under the Wash Sale rule. It would have to be added to the cost basis of the most recent purchase.

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