Tax on Investments

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How does tax work when investing in Index trackers?
Say I invested £20k in a General Investment Account on a Platform such as Dodl or Trading 121 and it’s now worth £26k.
If I sell it there is CGT on £6k less £3k tax free allowance = tax on £3k.
But can I just sell the investment, keep the money in the platform and buy something else - is CGT due then? Is CGT only applicable when it hits your bank account?
Thanks.

There is CGT whenever you crystallise the gain, so even if you reinvest the money in the same platform you will still need to pay the tax

You will also need to pay income tax on any dividends received from the fund, even if they are accumulation units and income is automatically reinvested

Thanks MsVisual.
The dividends received: would I have to keep track of those or do the platforms give a yearly statement like the banks do?

The platform should give you the information on dividends. If you have accumulation units ti will be called 'notional distribution'

This is useful

https://monevator.com/income-tax-on-accumulation-unit/

That’s great MsVisual - really useful. Thank you.