One of the largest issues at the moment is the confusing retainer wards, but SE is now sorting them out :3

The new system works that if you sell things through your retainer in the correct ward, you pay little to no taxes. If other items than the ones listed are sold, they pay increased taxes. Below is an image of the new ward channels.

Even better solution..

The FF14 version of FFXIAH, love and worship its glory.