2) Both my employer and me should have tax release for an amount converted into BTC as this could be treated as company benefit.
If you are simply employed, rather than holding independent contractor status, fill out a new W-4 form every time the IRS comes out with a new one. If you are not in the U.S., you need to do something similar with whatever forms you use. The exceptions are that if you are NOT in a common law country, or if the language is not English, do your research before you do this that I am about to tell you.
If you are not in the US you can fill out a 673 and check either the Bona Fide Residence Test, or a Physical Presence Test. They will stop taking out taxes until you reach $100k for the year.