Displaying taxed and untaxed doesn't work on SEF

I wanted to display the before AND after tax prices in the cart summary, and it works okay if I have SEF turned off

These photos show the cart with and without SEF turned on. The one that shows both prices is with SEF turned off.

image missing http://www.hikashop.com/media/kunena/attachments/legacy/images/taxes.jpg

where do you turn off SEF? I dont see that!