<prompt> Human: The title is pretty self-explanatory. I am buying ETF shares that have no cost to trade. After hearing about the Brexit, I waiting for a rally early in the day and the shares I had went from -2.6 to -2. At that point I sold everything. Later, I saw that they were dipping under -3, which is what I thought the low point of the day was going to be when I heard the news so I bought again. I understand at the time I may have sold and they may have gone up after that and never come back down to the value of when I sold. I get it. But having hindsight now, are there any consequences to this or was this all positive things for me?  <response>: You may have incurred taxes on the first sale. If you had losses, you may have lost the ability to deduct them as capital losses per the wash-sale rule. You got lucky and gained 1 on paper, in that you own the same assets but were able to buy them at a slight discount. 