Disclosure: this is informational only. For tax advice, please speak with a tax professional.Tax rules vary from country-to-country. In the US for example, the IRS says that cryptocurrency is taxed like property. That makes the taxes similar to stocks where capital gains taxes apply based on the appreciation of the asset between when you buy and sell (or trade) a crypto asset.The amount of tax depends on how much capital gain/loss there has been on the asset, how long you have held the asset, and other factors. Because each taxable event may create a capital gain, you need to know the date, cost basis, sale value, and any fees associated with each transaction.You can manually tabulate all of this information and calculate each tax lot for every buy, sell, trade, transfer, withdrawal, deposit across each coin in every exchange/wallet, split by short and long term capital gains. Or you can use automated software like CoinTracker to do this for you (note: I work on CoinTracker).