[Perdogg]

According to the article it appears to what he did was legal.

[Cu Roi]

Point 3 asks whether he used offshore vehicles to defer or avoid federal taxes. Yes, that's the point of these instruments, to defer or avoid taxes in a legal manner, which distinguishes it from tax evasion.

[9YearLurker]

I don’t even see anything unethical in his tax returns as reported. (And I’m no fan of Romney.)