Legality as such isn't really relvant when it comes to tax planning. Not only that, but most people don't actually care about illegal tax planning even if they

Legality as such isn't really relvant when it comes to tax planning. Not only that, but most people don't actually care about illegal tax planning even if they say they do, because in that case you would ask for a receipt ever time at your corner store. What you instead should ask yourself is if you are okay with people paying less tax then they would if the tax agency had all the information and resources to find out the truth.