The full answer
What actually decides it.
No. A student loan will not stop you borrowing, and on a dentist’s application it is unremarkable.
It matters because of how it is repaid rather than what it is. Your repayment leaves your pay before the money reaches you and appears on your payslip as a deduction, alongside tax and National Insurance. A lender is working out what you have available each month to service a mortgage, so something that leaves your account every month reduces that figure. It is arithmetic rather than judgement.
What it is not is a debt held against your name in the way a loan or a credit card is. It does not sit on your credit file as a balance to be subtracted from your borrowing, it is not a mark against you, and nobody underwriting your case will read it as a sign of anything. It is treated exactly the way any other monthly commitment is treated, and no differently because of what it paid for.
The practical effect is that it trims the top of what you can borrow. How much depends on the size of the repayment, which depends on your plan and your income, and on how the rest of your affordability looks. On most foundation salaries it moves the number rather than the answer.
It is also one of the few questions on this page where shopping around changes nothing. Every lender treats it the same way, so there is no better lender to find on this particular point.
Where lenders differ
- They do not differ. This is one of the places where every lender takes the same view: a student loan is a monthly commitment, it comes off affordability, and no lender either ignores it or penalises it beyond that. Changing lender will not change how yours is treated.
Written from Colin Wallace’s recorded interview with Joe Wallace, 24 August 2026 and reviewed by Colin Wallace.