We do not know today, but tomorrow can be worse. The criminals are not just the bad people alone, they can be a well known people in the government office like the police and others. If you are reporting your tax, there are government officials that will sign it and stamp it to clear you.
If you are providing information in the tax report or clearance, it is very possible that all your source of income can be requested for. What if the government official is a bad person and carry out a wrench attack on you or supplying criminals with people's bitcoin information?
Why are you going to let the government officials or the police to know all about you? We know that sometimes we have to provide the information about the source of income but I don’t think it is necessary for me to tell a police officer about my bitcoin and other important things about me, there are somethings that should remain private and never let anyone know about it except your family members.
No one can be trusted because most government officials are criminals, most especially the corrupt police, they can do anything just to have their own percentage from you, for me, I don’t think the information is necessary unless you want them to know that you have a bitcoin or want to expose yourself, no any government official that will know you have bitcoin if you don’t tell them, so let be careful with what we do when we found ourselves in that situation.