As I said in the first instance, everything they've done up until now is protected. In future, of course, any investments they make will be from a bigger pool of profits because their taxes will have gone down. They will be able to invest in their business, their active business, in exactly the same way they've done in the past, but with more funds because of the lower tax rate. They also will be able to maintain passive investments in their entity of up to about a million dollars.
On November 8th, 2017. See this statement in context.