Each year students borrow £10billion to £12billion from the Student Loans Company. If a student borrowed £48k over their course, they would owe £51k at graduation. If they earned £25k in their first ten years of work, £35k in their second ten years and £50k in their third ten years they would have repaid £31.5k, mostly in their final ten years. However due to compound interest they still owe £39,500. After thirty years the debt is written off. Most students will never reach these salary levels.