Does a large capital gain affect which tax band you're in?

hallmark

Apologies for this question which I ought to know but don't and can't easily find the answer…

If you're otherwise a basic-rate taxpayer, i.e. lets say you earn £40k, and you make a large capital gain (e.g. from selling a rental property) which gives you say chargeable capital gain of £150K, what rate of CGT do you pay?

Is it 18% because you were a basic rate taxpayer?
Or 24% because the capital gain itself pushes you into a higher bracket?

thanks

masonic

Part of the capital gain would spill over into the higher rate band.

There is a fairly clear description at https://www.gov.uk/capital-gains-tax/rates