What if you’ve lost 10%, do you get to claim that as a loss against your income at least?
In the current system: no. But in the proposed new system which the original post is about, you will be able to carry forward losses to future tax years. So if you realize a loss in year 1 and a gain in year 2, you can carry the loss forward and pay less or no taxes (depending on the exact amounts of loss & gain) in year 2.
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