There is a fundamental difference between HN and the IRS (for Americans, and corresponding agencies of the government for people in other countries): using HN i

There is a fundamental difference between HN and the IRS (for Americans, and corresponding agencies of the government for people in other countries): using HN is completely voluntary. Giving your personal information in a tax return is mandatory and not complying is punished severely. In my opinion, this sets the required standard to a completely different class. The tax services have an important responsibility to process their information in a secure way. The information needs to be protected against leaks. And from the outcome we can see that the protections are not adequate.