If you trade a lot or find keeping detailed records overwhelming then try a service like bitcointaxes.com. They can read transactions from your exchange(s), calculate your gain and tax, and even print your IRS form. Invaluable. Reasonably priced.
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Poloniex gives an option to export your trade history CSV. This is the most detailed the report can possibly get, with time stamps, fees, and profit/loss. Would this not be acceptable to the IRS? I feel that it MUST be sufficient. In a situation where I only trade on Poloniex I would hope this is acceptable.