My girlfriend and I are living together but we are not married. This year, we bought a bitcoin with her account which was worth about $8000 and we traded it against ethereum, cardano and dogecoin when the bitcoin was worth $30,000. However to do this transaction, we used my account... Who should declare the $22,000 gain?
If this was a joint venture you would split the profit. You can allocate it however you invested. If she invested $5,000 and you invested $3,000, then she would claim 62.5% of the profit and you would take 37.5% of the profit. If you did it 50/50, then you would split the profit.
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