4 Billion dollars profits per year - Which Industry? - Tax Fraud (by Cyber-criminals)

SNIPPET from the Article:-

Many consumers also begin to file their tax returns only to find out that someone else illegally filed a return in their names, according to ThreatMetrix. 

After a legitimate user files his or her tax return online, cybercriminals can compromise the system and steal personally identifiable information.

And finally, Cyber criminals are increasingly using social networks to collect data about their victims -- such as marital status or number of children -- which helps them to file more accurate tax returns and increase the success of their fraud.

The links below has more information:

http://www.darkreading.com/authentication/report-cybercriminals-bank-nearly-4-bill/240166574