Easiest way is probably to customize a lookup view.

Double-click TaxSchedule to add it to the columns list.

Then, back in the lookup list, choose your new View.

Note: there is a possibility (with the SO module) to have Ship To Addresses that have their own Tax Schedule... and there are also tax exemptions to consider, which don't show as NONTAX.

The Customer Listing (AR - Reports) can also show you everything, but it isn't presented in the most easily readable format.

Awesome! Thank you, much appreciated!