Actually! … Let me clarify something first of all as I inadvertently missed a pertinent WooCommerce setting first time round:
If I have enabled tax calculations, and elect to enter prices inclusive of tax but display them exclusive of tax, then I correctly see $90.91 (for a $100.00 product where that price includes tax at 10%). If I alter the settings to display prices inclusive of tax then I see $100.00 which seems to be as expected.
Can you confirm that you are seeing something other than this and detail and example case if so?
Thanks!