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Offsetting the tax on vested RSUs with short term capital loss
No. The gain on RSU is not a capital gain, it is considered wages and treated as part of your salary, for tax purposes. You cannot offset it with capital losses in excess of $3000 a year. If you have RSUs left after they vest, and you then sell them at gain, the gain (between the vesting price and the sale price) is capital gain and can be offset by your prior years' capital losses.