Jason Collier, a special education teacher in Virginia, often needs to wait until payday to fill up the gas tank of his car — and in the meantime hopes he doesn’t run out. “Money is tight when you’re a teacher,” Collier, 46, said. Now he’s afraid that the U.S. Department of Education will soon garnish up to 15% of his wages because he’s behind on his student debt payments. Collier said he hasn’t been able to meet his monthly bill for years, while juggling the expenses of raising two children and medical expenses from a cancer diagnosis. If his paycheck...