Yes, if you spent it on goods or services, you have effectively exchange the bitcoin - and that is a taxable transaction. The difference between the amount you paid for it and the amount you exchanged it for is the taxable gain or loss amount.
Like property sales or the sale of stock, any gain or loss from the sale or trade of cryptocurrency is reported as a capital gain or loss. If you buy and sell it within 12 months, it’s treated as a short-term capital gain. If you hold it for over 12 months, it’s taxed at the lower, long-term, capital gain rates. Here is how to enter the transaction.
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If you GAVE it to the other person and they "sold" it then they will have to report the sale using your basis. This is a gift like any other gift of stock. You may need to file a gift tax return if you gave more than $15K in one tax year to any person.