No changes in tax law yet so it is important to know what you need to pay after the gains from 2017. I signed up to a newsletter from http://schnidercpa.com (cryptocpa.tax) [no affiliation to me] to get a good summary of his interpretation of current tax law. However, given the global aspects of cryptocurrencies in general, I would always suggest seeking advice from a tax expert before doing any filing as taxes is always very particular to every person and situation.