Your'e right. But in fact (we are working in Eastern Europe) tax service can make little bit differ decision, and here we have practice of income directly from mining forgetting salary in BTC.
Do you have a registered business? If yes then you have to pay taxes on the money you're earning and paying your employees. It's a huge risk to neglect it because as a business you have to write reports and have bills for every payment. You just can't operate without it and the authorities often perform random inspections, so sooner or later they'll come knocking.
If you are a solo miner that's not registered you're safe as long as you don't cash out. You can keep your mined coins as long as you like and be perfectly safe until you move it all to your exchange account because from that moment the coins will become associated with your ID.
In order to avoid paying tax, I use online exchangers. They can be used to send the Fiat on any account without registration. In this case you will not track and you can do any in-store purchase without using your Bank account. It seems to me that bitcoin was conceived in order not to interfere with the government and therefore I consider myself free from tax liabilities.
I haven't seen an online exchange that doesn't require you to verify before allowing you to cash out. Even if such an exchange would exist you're still sending money to a bank account that's in your name. You have to be extremely naive to think that your fiat can't be traced by your government.