CSLM11061 - FAQs: borrowers questions and answers: amount of repayments: how much will I have to pay?
How much you repay depends on your income - the amount you earn (including things like bonuses and overtime) before tax and other deductions.
You’ll repay a percentage of your income over the income ‘threshold’ for your type of loan, depending on how often you get paid.
You can find more information on gov.uk.