I would assume, based upon your post, that you live in the United States. In the United States, you are only required to pay taxes on investments (cryptocurrency is considered an investment) when they are "cashed out" ... If you sell your cryptocurrency for fiat (ie. USD) and the value exceeds the "extra income" threshold, it needs to be claimed as "extra income" on your taxes. If you are dealing with values LESS THAN $1,500, I wouldn't worry about it. Also, there is no need to report anything on your taxes when trading one crypto for another -- or if you are holding an "estimated value" worth of cryptos in a virtual wallet. As far as the IRS is concerned, it doesn't exist until it is turned into fiat.
I am not aware of any US based exchanges that refuse to report their statements to the IRS. You can bet your bottom dollar if you sell your cryptos and send $50,000 to your bank account, and don't claim it on your taxes, you will be audited and most likely charged for tax fraud/evasion. Even if they don't catch you immediately, they could very well catch you 2, 3, 4, even 10 years later. You will still be responsible for all those unpaid taxes. If/when you are audited, I guarantee your bank won't be on your side, Coinbase (or whatever exchange you use) won't be on your side -- all of those entities will turn into big giant buses that will continually run you over
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
Better safe than sorry. If you sell it for fiat, you need to report it (anything over $1500-2000/yr).