when it comes to

1. Also,. As regards, when the situation entails. For example, When it comes to renting or buying, you'll spend about the same amount. It is also put as, as in If it comes right down to it, they said you could visit any time you're able to, or When it comes to that, we can lend you the fare. This idiom uses come to in the sense of “amount to” or “be equivalent to.” [Second half of 1700s]