More than 20,000 graduates were overcharged on their student loan repayments last year. They have forfeited hundreds of pounds in overpayments because money is still being deducted from their salaries despite having paid back the full amount they owe on their student loans. Figures given to MPs for the first time show that 20,900 young people were overcharged last year – about one in 50 of the students who should have finished paying off their arrears.