The Truth About Fixing vs Floating: Choosing the Right Mortgage Structure
Not all home loans are created equal — so which one’s right for you?
When you’re taking out a mortgage, choosing the right structure isn’t just about locking in a good rate. It’s about matching your loan to your lifestyle, your goals, and your risk appetite. And in a market like New Zealand’s, where rates rise and fall with global and local pressures, getting it wrong could cost you more than you think.
So, what’s the difference between fixed and floating interest rates? And how do you know which option is right for you?
Let’s break it down.
Fixed Rate: Certainty and Control
A fixed-rate mortgage means your interest rate (and your repayments) are locked in for a set period, typically 6 months to 5 years.
Pros:
- Stability: Your repayments stay the same, so budgeting is easier.
- Protection from rate hikes: If interest rates rise, you’re shielded.
- Peace of mind: You know exactly what to expect.
Cons:
- Less flexibility: You may face break fees if you sell, refinance, or make large lump-sum payments.
- Missed opportunities: If interest rates fall, you’re stuck paying the higher fixed rate.
- No offset or revolving credit options: Most fixed loans don’t allow for these flexible features.
Best for: People who value financial certainty and want predictable repayments, especially helpful for first-home buyers, young families, or those on a fixed income.
Floating Rate: Flexibility and Fluidity
A floating-rate mortgage (also called a variable-rate loan) means your interest rate can change at any time, usually in response to shifts in the Official Cash Rate (OCR).
Pros:
- Flexibility: You can make extra repayments or pay off the loan in full without penalties.
- Freedom: Great for those who want to throw extra money at their mortgage when they can.
- Opportunities: If rates drop, you benefit immediately.
Cons:
- Uncertainty: Your repayments can go up if interest rates rise.
- Harder to budget: Payments fluctuate — not ideal for tight financial plans.
- Potentially more expensive: Floating rates are usually higher than fixed rates.
Best for: Borrowers who want flexibility, plan to make lump-sum repayments, or are comfortable riding the ups and downs of the market.
Split Loans: The Best of Both Worlds?
Can’t decide? You don’t have to.
A split loan lets you fix part of your loan and float the rest. For example, you might fix 70% of your mortgage for two years and leave 30% floating to allow for extra repayments.
This strategy gives you:
- Certainty on a portion of your repayments
- Flexibility to pay down your loan faster without break fees
- Balance between risk management and opportunity
Talk to your mortgage adviser to figure out the right split based on your situation and risk appetite.
So… Which One’s Right for You?
Here’s how to decide:
| If you… | Then consider… |
|---|---|
| Prefer predictable budgeting | Fixed rate |
| Expect to earn more or receive bonuses | Floating or split loan |
| Want to pay off your loan faster | Floating or split loan |
| Are risk-averse or on a tight income | Fixed rate |
| Plan to sell or refinance soon | Floating (to avoid break fees) |
| Are buying your first home | Fixed or a conservative split |
Final Word
Choosing between fixed, floating, or split comes down to more than just chasing the lowest rate. It’s about understanding your financial goals, how much risk you’re comfortable with, and how your income and expenses might change over time.
The good news? You’re not locked into one structure forever, and with the right advice, you can build a mortgage strategy that evolves with you.
Not sure what’s right for you? Talk to a mortgage adviser who can walk you through your options and tailor a solution that fits your lifestyle, not just the bank’s model.