I have bought TSLA shares 6 different times, starting at 50, using my Wells Fargo Brokerage account. Latest purchase was after the dip on Thursday - 250 shares around 172. If I want to sell 250 shares in December at 200, I understand I pay taxes on the profits. My question is, how do I sell the new shares that have had less profit (and will have less taxes), then the shares I bought in May, which have had much more growth and will be subject to higher taxes? Is there a way to do this, or does it just take an average?