That word doesn't mean what you think it means.
It means keeping funds in overseas banks. The Caymans are the usual place, but there are others.
Overseas earnings kept overseas aren't a "$6 billion shortfall".
They are taxes that, if corporations actually were "people," would have to be paid.
Because Walmart isn't paying them, the middle-class is.
Welfare paid to employees isn't a "$6 billion shortfall" either.
SNAP benefits are paid for by your tax dollars.
You can dance around the terminology, but the fact is that if corporations find work-arounds, the individual taxpayer who doesn't have the luxury of hiding his assets, pays more. And closing those loopholes would be far less labor-intensive, and result in far more net revenue, than bullying the working poor.
Any thoughts about the chart at the last link?