Is it possible to default the tax based on location in Internet Expenses for R12?

In Canada, the tax code is (mostly) dependent on the location where the expense was incurred as opposed to the expense type. Therefore, assigning a tax code to the expense type in the expense report template is not helpful. Any suggestions on how to do this?  The Merchant locations are enabled so we are able to track the location (province) appropriately.

Thanks,

Candice