Thinking about whether to fix or float mortgage rates? You’re not alone — it’s one of the biggest decisions Kiwi homeowners face, and with good reason. Getting it wrong could cost you thousands over the life of your loan.
The reality is there’s no one-size-fits-all answer. But there is a smart way to think through your options based on your personal situation, and I’ll walk you through exactly how to do that.
What exactly is a fixed mortgage rate?
A fixed rate locks in your interest rate for a set period — typically six months to five years with NZ banks like ANZ, ASB, BNZ, Westpac, and Kiwibank. During that time, your rate stays put regardless of what happens in the wider market.
This means your repayments are completely predictable. If the OCR shoots up, you’re protected. If rates plummet, you miss out — and breaking early usually means paying a hefty fee.
The takeaway: Fixed rates give you certainty but limit your flexibility.
How does a floating mortgage rate work?
A floating rate (also called variable) moves up and down with the market, primarily following the Reserve Bank’s Official Cash Rate. Your repayments can change at any time, usually with a few weeks’ notice from your bank.
The big advantage? Complete flexibility. You can make unlimited extra repayments, pay off the loan early, or refinance without penalty. The downside is uncertainty — your repayments could jump significantly if rates rise.
Floating rates in NZ typically sit 0.5-1.0% higher than short-term fixed rates, but you pay for the flexibility.
The takeaway: Floating rates offer maximum flexibility but zero rate certainty.
Should you split your mortgage between fixed and floating?
Many smart borrowers use a split structure — fixing part of their loan while keeping a portion floating. You might fix 70% for rate certainty and keep 30% floating for flexibility to make extra repayments.
This approach works particularly well if you have surplus income you want to throw at your mortgage. You get some predictability while maintaining the ability to accelerate repayments on the floating portion.
The takeaway: A split mortgage can give you the best of both worlds.
What factors should guide your fix or float decision?
Here are the key questions I ask my clients when helping them decide:
How tight is your budget?
If you need to know exactly what your mortgage payment will be each fortnight — maybe you’re a first-home buyer stretching to afford the repayments, or dealing with irregular income — fixing gives you that certainty. Peace of mind is worth paying for.
Could you need to sell or refinance soon?
Breaking a fixed rate mortgage early can cost thousands in break fees. If there’s any chance you might sell, restructure your finances, or need to access equity during the fixed term, a shorter fix or floating rate might be smarter.
Do you have extra money to put towards your mortgage?
This is huge. If you regularly have surplus income — bonuses, overtime, or just good budgeting — you want the flexibility to make extra repayments. Most fixed rate products cap extra payments at $500-$1,000 per year without penalty.
Not sure how this affects you? Book a free chat with Jagdip.
What’s happening with interest rates right now?
While nobody has a crystal ball, understanding the current environment helps. When rates are expected to fall, fixing long-term can lock you into rates that become uncompetitive. When rises are expected, fixing protects you.
Right now in 2026, it’s worth discussing the rate outlook with someone who watches this stuff daily — that’s part of what mortgage advisers do.
The takeaway: Your personal circumstances matter more than market predictions.
What are your options when fixed rates roll over?
When your fixed term expires, your loan automatically rolls onto your bank’s floating rate unless you take action. This rollover decision is often more important than your original choice — and many borrowers miss it entirely.
At rollover, you should consider:
- Current rates across all major lenders, not just your existing bank
- Whether your circumstances have changed
- Cashback offers from competing lenders
- Different term lengths based on your current outlook
Your bank will send you a rollover offer, but they’re not comparing it to the market for you. That’s where having a mortgage adviser monitoring your rollover dates becomes valuable.
The takeaway: Rollover is your chance to review and optimise your mortgage structure.
What about using KiwiSaver for your mortgage decision?
If you’re planning to use KiwiSaver for a deposit or have accessed it recently, this might influence your fix/float decision. First-home buyers often benefit from rate certainty while they adjust to homeownership costs.
Similarly, if you’re building up funds for your next property purchase through KiwiSaver, maintaining mortgage flexibility might be important for timing your next move.
The takeaway: Your broader financial strategy should inform your mortgage structure.
Common scenarios and what typically makes sense
Here are some real-world examples from my experience as a mortgage adviser:
First-home buyer on a tight budget
Usually fix for 1-2 years. Predictable repayments help you budget confidently while you settle into homeownership. Check out our first-home buyer guide for more tips.
Property investor with multiple loans
Often splits or staggers across different terms. Keeping some floating preserves flexibility to sell properties without massive break fees across the whole portfolio. Our investment property section covers this in detail.
Borrower planning to sell within 12 months
Floating or very short fixed terms avoid break fee risk entirely.
High earner with surplus income
Floating or split structure allows aggressive debt reduction through unlimited extra payments. The higher rate may be worth paying for the flexibility.
The takeaway: Your situation determines the best strategy, not general market conditions.
How a mortgage adviser helps with fix or float decisions
When you’re weighing up whether to fix or float, a good mortgage adviser does several things your bank won’t:
- Compares rates across 20+ lenders simultaneously
- Explains how DTI ratios might affect your options
- Models different scenarios using our mortgage calculators
- Monitors your rollover dates and contacts you in advance
- Negotiates better rates than the standard offers
- Identifies refinancing opportunities you might miss
This service is completely free to you — I’m paid by the lender when your loan settles or rolls over. It’s about getting you the best outcome, not just the easiest one for the bank.
As your local NZ mortgage adviser, I help clients across Auckland and beyond navigate these decisions every day. The key is understanding your full financial picture, not just comparing headline rates.
The takeaway: Professional guidance helps you see options you might miss on your own.
Bottom line: How to decide what’s right for you
The fix or float decision comes down to three core factors: your need for certainty, your desire for flexibility, and your view on where rates are heading. Most successful borrowers prioritise their personal situation over trying to time the market perfectly.
If you’re approaching a rollover or setting up a new mortgage, take 30 minutes to discuss your options with someone who can see the full market picture. It could save you thousands and give you much better peace of mind about your choice.