With the language being used to describe what's going on, combined with the numbers that Alabama is estimating, it smells a lot like malware-infected PCs combin

With the language being used to describe what's going on, combined with the numbers that Alabama is estimating, it smells a lot like malware-infected PCs combined with the desktop edition of Turbotax (which offers free e-file if you buy the software). That would explain: * why it seems to be only hitting Turbotax users * the availability of 2013 data (Turbotax users usually buy every year) * the availability of logins to these sites While I wouldn't go so far as to say that this is the source of the data/problem, malware + desktop app + efile through Turbotax online fits the public information really well.