ProPublica reports on the shady tactics TurboTax and other tax software companies use to prevent most Americans from filing their taxes for free. According to an agreement with the IRS, tax software companies are supposed to offer a "Free File" product to Americans making less than $66,000 a year. From the report:After doing some digging in the source code, ProPublica found that TurboTax had branded them as "Non Free File Alliance" or NONFFA."Even though TurboTax could tell we were eligible to file for free, the company never told us about the truly free version. It turns out that if you start the process from TurboTax.com, it's impossible to find the truly free version. The company itself admits this."Another Google search brought them to a page with two options: "See If You Qualify" and "Start for Free." The "Start for Free" link brought them back to the version of TurboTax where they had to pay, but the "See If You Quality" link finally took them to the real Free File program.