Back to Blog

How Does A Student Loan Affect A Mortgage Pre-Approval?

23 May 20257 min readBy Jarrod Kirkland
How Does A Student Loan Affect A Mortgage Pre-Approval?

Key Takeaways

  • 1Student loans have smaller impact than most borrowers expect.
  • 2Banks assess 12% of income for student loan repayment, not the balance.
  • 3Credit card debt is far more damaging to mortgage applications than student loans.
  • 4Focus on deposit savings rather than paying off student loans in most cases.

Student loans typically have a smaller impact on mortgage applications than borrowers expect. Learn how banks really assess student loan debt.

This article addresses a common concern among first-time homebuyers: whether student loans significantly impact mortgage approval chances.

The Good News

Student loans typically have a smaller impact than borrowers expect. Banks assess student loans differently than other debts because repayment is fixed at 12% of income (once earnings exceed the threshold of $24,128 for the 2025-26 tax year), rather than based on the outstanding balance.

Loan Balance Doesn't Matter

Whether someone owes $3,000 or $300,000 in student loans, the bank's calculation remains identical-only the income percentage matters. This contrasts sharply with credit cards, where lenders assess 3% of the credit limit regardless of actual balance.

Strategic Considerations

The article distinguishes between two common mortgage obstacles:

1The Deposit Hurdle – Insufficient savings
2The Income Hurdle – Insufficient earnings relative to loan requirements

Paying off a small student loan might help only if it pushes borrowers past an income threshold without reducing their deposit below the 10% minimum requirement.

Debt Comparison

Credit card debt is far more damaging-even if the balances are the same. A $5,000 credit card costs approximately $150 monthly in affordability assessments, versus $500 monthly for equivalent student loan debt based on a $70,000 income-yet interest rates make credit cards riskier overall.

Need Help With Your Mortgage?

Our expert advisers are here to guide you through every step of your mortgage journey. Get in touch for a free, no-obligation consultation.

Talk to an Adviser

Frequently Asked Questions

Does my student loan balance affect my mortgage application?

Student loan balance does not matter to banks. Whether you owe $3,000 or $300,000, banks only consider the 12% of income repayment, not the outstanding balance.

How is a student loan different from credit card debt for mortgages?

Student loans are assessed as 12% of income, while credit cards are assessed at 3% of the limit regardless of balance. Credit card debt is generally more damaging to mortgage applications.

Should I pay off my student loan before applying for a mortgage?

Only if it pushes you past an income threshold without reducing your deposit below the 10% minimum. Otherwise, the student loan has minimal impact on approval.

Disclaimer

The information on this website is for general guidance only and does not constitute financial or investment advice. Always do your own research and seek personalised advice from a qualified financial adviser or mortgage adviser before making financial decisions. All investments carry risk and past performance is not indicative of future results.

Get the Mortgage Lab App

Access all our articles, calculators and tools on the go. Free on the App Store.

Download on the
App Store

Find an Adviser Near You

We can process your mortgage from anywhere in New Zealand using video meetings. If you don't live in one of these areas, simply choose any region to find an adviser.