Interest Rate Rise Impact Calculator
See exactly how much extra you would need to repay each month or week if your mortgage interest rate increased by a set amount.
Your results
Calculation breakdown
- Repayment change
- Repayment at new rate − repayment at current rate
Worked example
A $500,000 loan at 6% over 25 years would cost about $161 a month more if the rate rose by 0.5 percentage points.
Assumptions
- Assumes the remaining term stays the same and the full balance re-amortises at the new rate immediately.
How this calculator works
This calculator compares your current mortgage repayment with a new repayment after a specified interest rate rise, showing the extra dollar amount per period so you can plan your budget ahead of rate changes.
Frequently asked questions
How much does a 1 percentage point rise typically add to repayments?
The dollar impact depends on your loan balance and remaining term; a larger remaining balance or longer term means a bigger dollar increase for the same rate rise.
Does this recalculate my remaining loan term?
No, it assumes the same remaining term and shows the new repayment needed to still pay off the loan on time.
Can I use this for a rate decrease too?
Yes, enter a negative rate change to see the reduction in repayments from a rate cut.
Results are estimates only and are not financial, tax, legal or credit advice.