So I'm pretty sure the math is done in includes/admin/classes/sales_report.php to answer my own question.

Does anyone know my states sales tax causes a "DON'T MATCH!" with the Output Order Total Validation Column checked? Aside from maybe the obvious of the order total not including the sales tax... like DON'T MATCH! 5.99 : 6.41 (We have 7% sales tax in PA)