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  • Income Tax on Vested Stock Options Using FMV

    Hello - I have recently exercised a portion of vested stock options in my employer, a private company. The FMV at the time of purchase was greater than the strike price, meaning I need to pay income tax on the difference. My question is how do I prove what the FMV was at the time of purchase to HMRC? Given this could conceivably rise between then and the time I am able to pay the income tax through self-assessment after the tax year, I want to ensure I am only paying tax on the difference between FMC and strike price at the time of exercise.