Mortgage rollover is the process of choosing a new interest rate term when your current fixed mortgage expires. It’s one of the most important financial decisions you’ll make regularly as a homeowner — and most borrowers don’t give it the attention it deserves.
This guide covers what happens at rollover, how to get the best outcome, and common mistakes to avoid.
What Is Mortgage Rollover?
When you fix your mortgage for 1, 2, or 3 years, your rate is locked for that period. When the fixed term expires, you’re at a “rollover” — you must choose what to do next.
If you do nothing, most banks will automatically roll you onto the same fixed term at the current carded rate. This is rarely the best outcome.
What Happens If You Don’t Act at Rollover
If you don’t respond to your bank’s rollover notification:
- You’ll typically be automatically refixed for the same term at the carded rate
- The carded rate is almost always higher than the negotiated rate available to active borrowers
- You miss the opportunity to switch lenders without break fees
Example: Bank’s carded 2-year rate is 5.45%. Negotiated rate for same borrower: 5.25%. On a $600,000 mortgage, that’s $1,200/year difference — over 2 years, $2,400 left on the table.
The Rollover Window
Most banks will contact you 2–6 weeks before your fixed term expires with refixing options. Some banks offer an early rollover window of up to 60 days before expiry.
Key timepoints:
| Timeframe before expiry | Action |
|---|---|
| 6–8 weeks | Start researching — check rates, call a broker |
| 4–6 weeks | Your bank will likely contact you |
| 2–4 weeks | Negotiate with your bank; contact alternative lenders |
| 1 week | Finalise your decision |
| Expiry day | Rollover takes effect |
Your Rollover Options
At rollover, you can:
- Refix with your current bank — choose a new fixed term and negotiate the rate
- Switch to another bank — refinance to a different lender for a better rate or cashback (no break fee applies at rollover)
- Go to floating — maximum flexibility, but typically a much higher rate
- Split — divide your mortgage across two fixed terms to stagger refixing
How to Negotiate at Rollover
Your bank’s first offer (the carded rate) is a starting point, not a final offer.
Negotiation steps:
Get quotes from other banks — visit 2–3 bank websites or use a mortgage broker. Knowing competitor rates gives you leverage.
Call or email your bank’s mortgage team — don’t accept the rate from your existing fixed offer without asking for a discount. Say you’re considering refinancing and ask what they can do.
Mention cashback offers — if another bank is offering cashback (e.g., $3,000 cashback for a $500k refinance), your current bank may match it or offer a rate discount equivalent.
Ask specifically: “Is that your best rate for my profile?” — banks can often go 0.1–0.3% below carded.
Use a broker — mortgage brokers access wholesale rates and can compare multiple lenders simultaneously. No cost to you; broker is paid by the bank.
Should You Switch Lenders at Rollover?
Switching at rollover (with no fixed term remaining) means no break fee. This makes rollover the cheapest time to switch.
Worth switching if:
- Another bank offers a materially better rate (0.2%+ lower)
- You can access a significant cashback (e.g., $3,000–$5,000)
- Your current bank’s service has been poor
- You want to access a product (revolving credit, offset) not available with your current lender
Not worth switching for:
- Rate differences under 0.1–0.15% — legal and admin costs can eat into gains
- If cashback is offset by a higher rate (calculate total interest over the cashback payback period)
See Switching Mortgage Lenders NZ for the full switching process.
Choosing the Right Fixed Term at Rollover
The rate environment at the time of your rollover determines the best term. Key considerations:
| Market scenario | Consider |
|---|---|
| Rates falling, OCR in easing cycle | Shorter terms (1–2 year) to benefit from falling rates sooner |
| Rates stable, low uncertainty | 2–3 year for balance of rate and certainty |
| Rates rising, OCR hiking | Longer terms (3–5 year) to lock in before rates go higher |
| You expect to sell within 2 years | 1-year fixed or floating to minimise break fee risk |
See When to Fix Your Mortgage NZ and Fixed vs Floating NZ for detailed guidance.
Common Rollover Mistakes
1. Accepting the bank’s first offer Always negotiate. The carded rate is rarely the best rate for loyal customers.
2. Auto-rolling to the same term without reviewing Market conditions change. The 2-year rate that was best 2 years ago may not be best today.
3. Missing the rollover window If you miss the notification, your bank will roll you automatically — often at the worst rate. Set a calendar reminder 6 weeks before your fixed term expires.
4. Choosing based on rate alone Cashback, offset accounts, revolving credit features, and service quality all affect the total value of your mortgage product.
5. Not considering a split If you’re uncertain about rate direction, splitting across 1 and 2-year terms (or 2 and 3-year) reduces risk without locking the full premium of a longer term.
Rollover and Cashback
At rollover, you can switch to a lender offering cashback without any break fee. Cashback deals effectively reduce your total interest cost if the rate is competitive:
Example: $600,000 mortgage, 2-year rollover. New bank offers 5.45% + $4,000 cashback.
- Cashback equivalent rate reduction: $4,000 / ($600,000 × 2 years) = ~0.33% pa equivalent savings
- If the rate difference is less than 0.33%, the cashback is the key value driver
See Cashback Mortgages NZ for a full cashback evaluation guide.
Further Reading
- Refixing Your Mortgage NZ — step-by-step refixing process
- Switching Mortgage Lenders NZ — how to switch at rollover
- How to Get a Better Mortgage Rate NZ — negotiation strategies
- Fixed vs Floating Rate NZ — core rate decision framework
- When to Fix Your Mortgage NZ — timing strategy
- Cashback Mortgages NZ — cashback evaluation
- Refinancing Guide NZ — full refinancing overview