The groups affected include:

— Borrowers whose loan balances have ballooned because of interest would have up to $20,000 of their interest balance canceled. The plan would waive the entire interest balance for borrowers considered “low- and middle-income” who are enrolled in the administration’s income-driven repayment plans.

The interest forgiveness would be a one-time benefit, but would be the largest relief valve in the plan. The administration estimates that of the 25 million…