Bitcoin is not an official currency. That is, most countries still require you to pay income taxes, sales, payroll, and capital gains tax on anything that has value including bitcoin. It is your responsibility to ensure that you comply with any other tax and legal rules or policies issued by your government and / or policy makers in your area.
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Bitcoin is not official currency but many people are making a transaction with it and only a few people are paying taxes on it. It is very good for us if we pay taxes to the government for usage of bitcoin so that government will start recognizing the Bitcoin as a legal currency.