Once you graduate, the Student Loans Company (SLC) will expect you to start repaying your loans from the April after you completed your course.
If you’re earning less than the set income threshold before any deductions (tax or national insurance contributions), you’ll not be liable to repay anything.
You can view up-to-date details on income thresholds and repayments via the SLC's loan repayment information. If you’re earning more than the set threshold, repayments will be collected directly from your wages by HM Revenue and Customs before you receive them. Repayments are currently 9% of what you earn over the income threshold.
If you go overseas for more than 3 months, you'll be subject to repayment threshold for the country to which you've moved. The thresholds are based around the cost of living and you can view them on the Student Loan Repayment website.