OK here is an article : https://www.gestiondefortune.com/fiscalit%C3%A9-droit/rubriques-fiscalite/5125-fiscalit%C3%A9-du-bitcoin-un-super-coup-pour-le-fisc.html Soory its in french but basically they take 45 % plus 17,2 % on your benefits , and if your bank sees money coming from BTC selling they can repport on you .... This is France .....
I agree that selling and going into fiat is not wise but look at people like me if we want to buy a house or just pay bills that you can only pay in fiat at point you have to convert !!!!