C?mon ? Felix is not a person who would fear threatening letters. Obviously, it depends who threatens us. The picture tells you what threats do not need to be reported to the police. Although on the other hand, perhaps someone has tried to denounce tax blackmail and that was not a bad idea at all? You may be sure that the risk of threat can be mitigated by checking exactly the calculations of CIT income tax, especially before the annual tax return is filed. It is also worth checking if the advances for CIT have been calculated correctly during the year. This is supported by dedicated expert systems like the one accessible at this link.