2025/26 thresholds — check gov.uk for current figures
Uses the published income thresholds and rates: Plan 1 £26,900, Plan 2 £29,385, Plan 4 £33,795, Plan 5 £25,000, and Postgraduate Loan £21,000 a year, each repaid at 9% above the threshold (6% for Postgraduate Loans). Thresholds and rates change each tax year and this does not cover having more than one plan type at once — see gov.uk: repaying your student loan for current figures and combined-plan rules.