So, what are the crypto tax regulations for capital gains and losses? The bigger issue is the breadth of information you need to have to properly report each transaction. If your record keeping for each transaction has been less than thorough, it can seem almost impossible to file an accurate return. In addition to the date of purchase of the cryptocurrency, you should know the amount you paid in EUROS. Even if you were exchanging one cryptocurrency for another, the cost of the purchase must be quoted in dollar value at the time of the transaction. Given the constant fluctuations of the market, this price is rarely static. Additionally, you will need to state the date you sold the coins and the amount you received for them. Unfortunately, many cryptocurrency holders cannot retrieve this information from their exchanges and will have to investigate each transaction individually.