More than 643,000 federal student loan borrowers in the United States are currently stuck in a growing administrative backlog, waiting either to be approved for more affordable repayment plans or for long-term loan forgiveness. The figures, revealed in a recent court filing and first reported by CNBC, highlight the growing strain on the system as millions of applicants go missing at a time when payment obligations for millions are tightening.Nearly half a million applicants have yet to receive a decision on their applications for IDR plans, the complaint shows. Tens of thousands of applicants are now hoping for PSLF help to pay off their loans. The sheer volume of the backlog underscores the popularity of such payment programs while illustrating the difficulties faced by the US Department of Education due to changes in payment plans across the country.Massive backlog of payment plan applicationsOfficial figures confirm that as of the end of March, there were a total of 553,966 borrowers whose applications for IDR plans were pending. Such plans are very important for borrowers who have difficulty meeting monthly payment requirements.Income-based repayment plans allow borrowers to make affordable payments by linking their repayment amount to income and number of family members. However, the sheer volume of pending applications suggests that access to these benefits is far from smooth.Thousands of people are waiting for loan waiver decisions.In addition to IDR applicants, 89,720 borrowers are still awaiting decisions on their public service loan forgiveness applications. The PSLF program, signed into law in 2007, allows government and nonprofit workers to cancel their outstanding student loans after 10 years of qualifying payments.Another recent addition—the “buyback” option—was introduced to help borrowers meet qualifying payments during periods of deferment or forbearance. While the mechanism was intended to speed up pardon timelines, it has also contributed to a growing backlog of applications that have yet to be processed.Progress, yet some challenges remain.The Education Department has made considerable progress in dealing with the backlog of IDR applications. The number of pending applications fell from an estimated 1.4 million in July to less than 500,000 in March. In addition, more than 21,200 borrowers benefited from loan forgiveness through their IDR programs in March, a significant increase from February, when there was no forgiveness at all.However, this is not the case for PSLF candidates. The number of borrowers awaiting “buyback” decisions has risen steadily in recent months, pointing to continued bottlenecks in this part of the system.Pressure is mounting amid policy changes.Experts have warned that the backlog could worsen in the coming months. Accordingly, the U.S. Department of Education is imposing a deadline on borrowers to opt out of the SAVE plan under the Biden administration, which could lead to another influx of borrowers applying for other options in terms of repayment.This can put additional strain on the system and cause further delays for those waiting to be processed.Student loan borrowers find themselves increasingly financially strapped.The delay comes amid particularly difficult times for student loan borrowers. Not only are millions of people struggling to deal with repayment problems, but many are struggling to manage their debts.Based on the survey results, CNBC reported that “42% of federal student loan borrowers report that paying off their student loans affects their ability to pay for basic needs like food and housing.”Adding to the complexity, nearly 9 million borrowers were in default as of December, according to higher education analyst Mark Kantrowitz. This combination of large numbers of defaulted borrowers with aid program application delays reflects the challenging reality of today’s student loan situation.An unclear path aheadDespite efforts on both fronts, the growing backlog casts doubt on the system’s effectiveness in helping those who currently need it. For many borrowers, the waiting period continues without a concrete answer.The coming months will be crucial as the system tries to adjust to the changing conditions.