First-Time Buyer Affordability Calculator
Calculate your maximum property budget with student loan debt. See exactly how loan repayments reduce your borrowing capacity.
Key Takeaways
- Most UK lenders offer mortgages of up to 4.5 times your annual income, but student loan repayments are deducted as committed expenditure before that multiple is applied.
- Every £100 per month in student loan repayments reduces your maximum mortgage borrowing by approximately £20,000.
- Student loans do not appear on your credit file and do not affect your credit score — lenders see repayments through your payslip deductions instead.
- First-time buyers pay no stamp duty on properties up to £300,000 from April 2025, with 5% charged on the portion between £300,001 and £500,000.
- Your loan plan determines how much is deducted each month — Plan 2 has a higher repayment threshold than Plan 5, so Plan 2 borrowers keep more of their earnings before repayments begin.
Significant Student Loan Impact!
Your student loan reduces borrowing capacity by: £15,507
Property budget reduction: £15,507 (7.9%)
Monthly student loan payment of £65 significantly reduces how much lenders will let you borrow.
How It Works
Lenders assess student loan monthly payments as debt commitments, reducing your affordability by approximately £18-20k per £100 monthly payment.
Monthly gross: £3,167
LTV: 86.1%
Monthly payment: £65
Your Budget
Affordability Comparison
With Student Loan
Without Student Loan
Student Loan Impact
Monthly Budget Breakdown
Affordability ratio: 37.1% of gross income
Lenders typically prefer housing costs below 40-45% of gross income.
Total Upfront Costs
Want a detailed breakdown? Check the official Stamp Duty Land Tax rates on gov.uk.
How Lenders Calculate Your Capacity
Each £100 monthly student loan payment reduces borrowing by approximately £18,000-£20,000.
Key Insights for Graduates
What This Means
- • Student loans reduce borrowing capacity, not eligibility
- • Lenders assess monthly payment, not total balance
- • Focus on building larger deposit to compensate
- • Consider joint applications to improve affordability
Don't Overpay Loans
- • Overpaying loans barely improves affordability
- • £10k off loan saves ~£60/month = £10k extra borrowing
- • Same £10k as deposit = £10k extra property + better rates
- • Always prioritize deposit over loan overpayments
Understanding Student Loan Impact on Mortgages
How Lenders Assess Student Loans
- • View monthly payment as debt commitment
- • Reduce affordability by ~20x monthly payment
- • Don't care about total balance owed
- • See payment on payslips via PAYE
- • Apply standard income multiples minus impact
Strategies to Improve Affordability
- • Save larger deposit (15-20%+ for better rates)
- • Joint application with partner/family
- • Wait for salary increases to grow capacity
- • Consider regional areas with lower prices
- • Never overpay student loans to help mortgage
Why Not to Overpay Student Loans for Mortgage
Many graduates wonder if overpaying their student loan will improve mortgage affordability. The mathematics show this is almost never worthwhile:
- • £10,000 overpayment reduces your balance and saves ~£60/month in payments
- • This £60/month saving increases borrowing capacity by only ~£10,000-£12,000
- • The same £10,000 used as deposit increases property budget by £10,000 AND secures better rates
- • Most student loans write off after 40 years anyway—overpayments often wasted (see our student loan calculator for write-off projections)
Always prioritize deposit savings over student loan overpayments.
Ready to Start Your Property Journey?
Understanding your true affordability with student debt helps you search for properties in the right price range and avoid disappointment.
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