What happens if I need to borrow more money when porting my mortgage?
Porting with a larger loan creates a blended rate: the original balance keeps its old rate while the new-money portion is added at current rates, weighted by dollar amount.
Key Points
If you need to borrow more money when porting, that extra amount will be subject to current mortgage rules.
Think about blending your current interest rate with a new rate for the additional funds you're borrowing.
Your (/glossary/loan-to-value) (LTV) will be recalculated based on your new home's value and the total mortgage amount.
Make sure your debt ratios (how much of your income goes to debt) are still within acceptable limits with the increased mortgage.
Borrowing more money could change your overall mortgage repayment schedule.
Technical Research Verification
Our systems synchronized 3 data points and regulatory frameworks to verify this technical brief.
Related Questions
How does the stress test differ for fixed vs. variable in 2026?
Both are stress-tested at the higher of the benchmark (5.25%) or the contract rate + 2%.
Why are 3-year fixed rates dominating the 2026 market?
Borrowers are hesitant to lock in for 5 years at current levels, but find 1-2 year rates too expensive.
Fixed vs. Variable Comparison Table
Fixed locks a 5-year rate with IRD penalty risk; variable floats with prime and typically caps break fees at 3 months interest.
What is the 'IRD' penalty risk for 5-year fixed borrowers?
The Interest Rate Differential (IRD) can cost tens of thousands if you break a fixed mortgage when market rates have dropped.