There's also https://bitcoin.tax/ https://bitcoin.tax/ I haven't used this product and I'm not vouching for it in any way, but it looks like a solid thing, and

There's also https://bitcoin.tax/ https://bitcoin.tax/ I haven't used this product and I'm not vouching for it in any way, but it looks like a solid thing, and I intend to use it this year to figure out how much I owe for my trades. It appears to have grown since I looked at it last, for $20 you get the ability to import as many transactions as you want from CoinBase, GDAX, and ~15 or so others, and you get your answer in a form that TurboTax can include in your returns. Last time I looked, I think that it supported CoinBase but not GDAX. (So it appears to have grown since then.) I don't know how much I trust a tax service for $20, but I think I trust it further than I can throw a spreadsheet that I created and populated with trade information by hand...