How to change default tax class on ci_item?

SOLVED

Hello, 

We are making some changes regarding taxes at our company and are wanting to change the default tax class when adding new items. Currently, when a new item is added it is assigned 'NT' (non taxable) tax class,  and we want it to default to 'TX' (taxable). 

I'm thinking there has to be a way, but I've looked through all of the maintenance and set up windows but am unable to find a setting to do this. 

Thanks!