Hi,
As Jerome explained previously, you can find settings to change the price display to be with or without taxes or both.
For example, on the listings, each menu item and modules has such taxed price display setting, so no code is necessary.
In the emails and checkout, the main "show taxed prices" setting of the HikaShop configuration controls the display so that you can choose if you want to display taxed or untaxed prices all with that one option. So you should check it out. It will be easier than changing the code in each view or email.