Trade-in Value Reduction for MacBook with Dysfunctional Port

I currently own a MacBook, and I am planning to buy a new one late this year. But the thing is that due to a water accident, one of the ports are now dysfunctional (the other one works fine). There are no other defects beside this one port, and everything works fine in day to day use. How much of a hit would the trade in value get if I were to give this to Apple?

To clarify, the model I currently have is the M1 13" MacBook Pro 256GB (2020).

[Re-Titled by Moderator]

Original Title: Trade in Value Reduction