This is where my idea comes in

[phoebemia]

3. This is where my idea comes in.
What does come in mean here? Could you kindly rephrase the sentence?

 

[Tarheel]

Well, I don't know what his idea is, but he seems to be saying that's the situation in which his idea is useful.

I hope that helps.

 

[emsr2d2]

He's referring, in advance, to the pocket money chart he's about to introduce. Saying "Here's where my idea comes in" is like saying "At this point, my great idea is going to enter the story".