At a certain level of complexity even the tax authorities can't decide what is legal and what isn't and they will basically try legal action against you to see what the court decides. I've pursued an official statement from my country's tax authority about a tax issue I had pertaining paying taxes when you do business in several countries at once, and after months of hassling the tax office through a lawyer we finally got a letter saying that "we cannot see anything wrong with what you are trying to do, but this letter is not binding, it is neither a promise nor a guarantee that we will never take any legal action against you if we decide differently at any point in the future. This is all advice that we will be providing on the matter".

Guess what happened - a year later they decided it wasn't ok, and of course the letter they wrote was worth as much as toilet paper in the court. It took 5 more years and a very decent amount of money to fight against it and finally get them to admit they were wrong and there is no issue. But of course no one will give you 5 years of not being able to run your business back.