There doesn't seem to be a tax column, just a total. I have to click each order individually to get the tax on that order, and it doesn't show up on the fields for exporting.

As said, you have to add this column (editing the view or developping a custom module). But a more simple solution is to export in Excel document with the columns you want.

Ah, okay, found out where to add it. Thanks for pointing me in the right direction, as well as telling me about that Excel export, I didn't know about that, and it'll make things so much easier from here on.

For anyone catching this later, add <field name="amount_tax"/> to point_of_sale_view.xml under pos.order to get the column.