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How are long term capital gains taxes calculated?
You pay taxes on capital gains when you realize your gains by selling the investment property.  Also, in the US, taxes on capital gains are computed at special rates depending on your current income level, and so when you realize your gains two years from now, you will pay taxes on the gains at the special rate then applicable to your income level for the year of sale. Remember also that the US Congress  can change the tax laws at any time between now and the time you sell your stocks, and so the rates you are looking at now may have changed too.