But that your government recognizes bitcoin as a currency? I doubt it. Your income in bitcoins according to the law is not revenue. If you buy goods with bitcoin it does not fall under the tax base. If you exchange them for your currency, then taxes will have to pay.
You are correct mate because what you have said already happened here in my country where local exchanges were regulated by centrql banks backed by the government. All cryptocurrency funds that we are about to convert into fiat money will automatically be deducted with tax. For me tax is okay because they can only do it once during the convertion of cypto funds into fiat currency and it will also help improve our country's economy because Bitcoin community here is increasing therefore there will be enough tax for it.