The maximum capital loss tax deduction is $3000. The taxes on capital gains are unlimited. If you take more than $3000 in losses then you will just end up paying more in capital gains when you finally make money.
Certain investments, it is true that you can wait til you sell to do the capital gains on the investment. Other investments such as futures etc. you must do the capital gains on it, whether you sold it or not.
It also depends on whether it is a tax deferred such as a 401K or IRA or whether it is a regular taxable account.
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