Home Loan Stress Test Calculator
Check how your mortgage repayment would change if interest rates rose, to see whether your budget could absorb a rate increase.
Your results
Calculation breakdown
- Stressed repayment
- Annuity formula recalculated at current rate + rise amount
Worked example
A $500,000 loan at 6% over 25 years would rise from about $3,221 to $3,899 a month if rates increased by 2 percentage points.
Assumptions
- Uses a simple like-for-like repayment comparison, not a full lender serviceability assessment.
How this calculator works
This calculator recalculates your mortgage repayment at a higher stressed interest rate, showing the dollar increase so you can gauge how exposed your household budget is to future rate rises.
Frequently asked questions
What stress test rate do lenders use?
Lenders commonly assess new loans using a buffer of around 3 percentage points above the actual rate, though this varies by lender and is set by their own credit policy, not by a single fixed government rule.
Is this the same as the bank's serviceability assessment?
No, this is a simplified repayment comparison, not a full serviceability assessment which also considers your income, expenses and other debts.
What should I do if the stressed repayment is unaffordable?
Consider building a larger savings buffer, reducing other debts, or speaking with a financial counsellor or your lender about your options.
Results are estimates only and are not financial, tax, legal or credit advice.