it depend on the area and the country where you are living, if your country has imposed tax on bitcoin they you have to pay tax but i thin still not a single country has yet consider bitcoin as legal currency therefore there is still no tax on bitcoin.
That is absolutely incorrect. Bitcoin doesn't have to be a currency for taxes to be imposed on it.
Taxes are imposed on income / profits and you definitely can profit using bitcoins.
Taxes is a very hot issue for everyone; so if someone wants to have an overview as regards the legislation on taxation can take a look at this article
https://en.wikipedia.org/wiki/Legality_of_bitcoin_by_country by Wikipedia. About what is happening in every country because the article is relatively old and the tax legislation in some countries changes very often should be addressed to the appropriate law firm. Especially if it concerns EU country then the attorney firm must have the appropriate experience and knowledge of EU directives because many EU countries prefer to embodiment the EU directive particularly if the issue is global, complex and there is not the relevant experience