It will not last though. I've read many articles about how the taxmen are finding ways on how to properly check and tax all the people getting a little income from Uber or Airbnb. Income in BTC will be much harder to tax happily for us.
it will be impossible, when bitcoin will be adopted on a large scale, they can not track anyone who is using bitcoin directly, especially for small thing and especially if done in real life with someone else that want to avoid tax and he is selling used stuff
But bitcoin is more traceable than cash. The authority just need supercomputer and good database software, then they can link most transactions with individuals.
how? if i'm only moving funds from one address to another, how they can link a transaction to my name?
as long as you don't connect your address with a shipping address, bitcoin is not traceable
If you use the coins for one online transaction and deliver the goods to your home, the taxman can ask the company to reveal your identity and link all your previous transactions.