Tax on private compamy stock options

Hi! I am leaving my current company and with it I can buy some stock options which I have vested over the years. The company is not yet public and so there is no market price for this stock at the point of excercise. How (if at all) is income tax applied in this case? Is it applied on the difference between the strike price and the newest evaluation value at the point of exercise (Similar to the FMV for public stock)? Thanks.

Hi,
The market value of unquoted shares will normally be negotiated between HMRC and the company before the relevant options are granted or shares are awarded.
You can find general guidance about tax on employee share schemes at Tax and Employee Share Schemes: Overview
You can find detailed HMRC guidance on tax-advantaged share schemes at ETASSUM10000 - Introduction to tax advantaged share schemes: contents - HMRC internal manual
Thank you