You have to make repayments on your Postgraduate Loan when you earn above a certain threshold.
For those who took out their loan while living in England or Wales, this threshold is £21,000 (or £1,750 per month / £404 per week). Above that amount, 6% of your earnings go towards loan repayments. If you’re in Scotland or Northern Ireland, there’s a different threshold. There, postgraduate loans are treated in the same way as Student Loans.
If you’re making repayments but don’t think you should be, it’s best to get in touch with the Student Loans Company directly.
These figures are correct for the 2019/20 tax year.