Exactly!
We have quite a few employees here that get that credit, and a good bit back on their refund. Some will, and I am not making this up, work up until they get their refund, then take a vacation in May, and go look for work at the end of the summer. They make enough on the refund to carry them through the summer, and by not working, they keep their income low enough to get it again.
We don't rehire them, they go off somewhere else. But, if you are a $9.00/hr call center employee, it ain't that hard to find a job, as all of them have not been moved to Mexico or India.