Hi Geck09,
If the company reinvests the dividends by using them to purchase additional shares on a shareholders’ behalf through a dividend reinvestment plan (DRIP) (the company reinvests the shares automatically, without the shareholder having to do a thing or ever receiving the dividends physically themselves)
That shareholder does not pay Income Tax on the reinvested dividends until they eventually sell the shares.
At the point of selling the shares, Capital Gains Tax would apply on any increase in share value since the reinvestment occurred.
For the share save please refer to:
Tax and Employee Share Schemes
Thank you.