You should pay the taxes if your country government has taxation system for crypto currencies.But many developing countries don't have any taxes yet for the bitcoins so you no need to pay any taxes you just can pay the income taxes which is supposed to pay annually if you earn more than the country limits.But we don't have to pay any taxes actually because bitcoin was a decentralized technology it was found to be fight against the centralized fiat system but the governments are making benefits from everything so they are controlling the crypto usages too.