This development is starting to raise red flags for many who are concerned about student loan debt.

Josh Mitchell reports at the Wall Street Journal.

Grad-School Loan Binge Fans Debt Worries

Virginia Murphy borrowed a small fortune to attend law school and pursue her dream of becoming a public defender. Now the Florida resident is among an expanding breed of American borrower: those who owe at least $100,000 in student debt but have no expectation of paying it back.

Ms. Murphy pays just $330 a month—less than the interest on her $256,000 balance—under a federal income-based repayment program that has become one of the nation’s fastest-growing entitlements. She plans to use another federal program to have her balance forgiven in about seven years, a sum set to swell by then to $300,000.

The promise of forgiveness is “the only reason I would have ever considered” amassing so much debt to attend Tulane University Law School, says Ms. Murphy, 45 years old. She earns $56,500 a year as an assistant public defender in West Palm Beach.

The doubling of student debt since the recession, to $1.19 trillion, has stoked a national discussion over how to rein in college costs and debt and is becoming a major issue in the 2016 presidential race. Little noted in the outcry is the disproportionate role played by postgraduate borrowers, who now account for roughly 40% of all student debt but represent just 14% of students in higher education.

Propelling the surge in grad-school debt is a welter of federal programs that make it easy for students to borrow large amounts, then to have substantial chunks of those debts eventually forgiven. Critics of the system say it makes it easier for graduate schools to raise tuition, and for some high-earning graduates such as doctors to escape debts they can afford to repay.