Keep it if it adds relevant evidence that your more recent experience does not already provide. The fact that it happened before your MBA does not automatically make it irrelevant.

The tradeoff is resume space. If your current full-time roles already demonstrate stronger client work, analytics, leadership, and impact, the old internship may no longer deserve much room.

You can also compress it to one line or one bullet if the brand or consulting exposure is useful but the details are no longer central. That preserves the signal without crowding out recent achievements.

Prioritize recency and strength, not a rigid rule about dates. Every line should earn its place by making the current MBA candidacy more credible.

I kept my old consulting internship as one line. It gave context without taking space from my recent job.