Take a $650,000 home, 20% down ($130,000), and a $520,000 mortgage at roughly 5.99% on a 1-year fixed rate, spread over a 30-year table loan — the monthly payment lands around $3,114. That rate is locked for just twelve months. New Zealand borrowers commonly fix for even shorter periods — six months isn't unusual — making this one of the most frequently-repriced mortgage markets covered on MortgagePro Global, ahead of both the UK's 2-5 year norm and Canada's 5-year term structure.
Fixed vs. Floating, and Why Short Terms Dominate
NZ borrowers choose between fixed rates (locked for a set term, commonly 6 months to 2 years, sometimes longer) and floating rates (which move whenever the lender adjusts, tracking the Official Cash Rate environment more directly). Fixed rates are the default for most borrowers, but the short end of the fixed-term spectrum is unusually popular compared to other markets — many borrowers deliberately choose 6-12 month terms to stay flexible if rates are expected to fall, accepting more frequent repricing risk in exchange.
The Math
Standard NZ mortgage repayments (table loans) use monthly compounding, the familiar amortization formula:
Where P is the loan amount, r is the monthly rate (annual ÷ 12), and n is the number of monthly payments — but because the fixed term is often just 6-12 months, this rate is genuinely temporary in a way it isn't for a US or Canadian borrower.
Worked Example
| Input | Value |
|---|---|
| Property price | $650,000 |
| Deposit (20%) | $130,000 |
| Loan amount | $520,000 |
| Rate | ~5.99% (1-yr fixed) |
| Table loan term | 30 years (360 payments) |
| Monthly Payment | ≈ $3,114 |
Common Mistakes
Borrowers frequently split all their borrowing into one fixed term, which means the entire mortgage reprices at once when that term ends — many advisers recommend splitting a loan across two or three different fixed terms (a "laddering" approach) specifically to avoid the whole mortgage repricing simultaneously into an unfavourable rate environment.
Borrowers also default to accepting their existing bank's rollover rate without comparison shopping — because refixing happens so often here, the cumulative cost of never negotiating or switching adds up faster than in slower-repricing markets.
A third mistake: choosing a floating rate purely for flexibility without checking the real cost — floating rates typically sit meaningfully above the shortest fixed rates, a premium worth being deliberate about rather than defaulting into.
Where This Calculator Has Limits
It uses a single fixed-rate snapshot — since most NZ mortgages reprice within a year or two, the true lifetime cost depends heavily on a rate path across many future terms, not one number. It also assumes a standard table loan (principal and interest); interest-only structures calculate differently, covered in our Repayment Calculator.
Frequently Asked Questions
Is a 1-year fixed rate always cheaper than a 2-year fixed rate?
Often, but not always — it depends on the shape of the current rate curve; sometimes longer terms price lower if the market expects rates to rise.
What happens automatically when my fixed term ends?
Your bank typically rolls you onto a floating rate or a default fixed rate if you don't actively choose a new term — usually not the most competitive option available.
Can I split my mortgage across multiple fixed terms?
Yes — this "laddering" strategy is common in New Zealand specifically because of how frequently borrowers reprice here, and it can reduce the risk of the whole loan repricing at once.
Does a bigger deposit affect my rate here the way it does elsewhere?
Yes — crossing loan-to-value thresholds (particularly the 80% LVR line) affects rate access and lending restrictions, covered in our LVR Calculator.
Is floating always more expensive than fixed?
Usually, yes, at the shortest end — but it offers full flexibility to switch or make unlimited extra repayments without break fees, a genuine tradeoff some borrowers value.
Related Tools
LVR Calculator · DTI Calculator · Repayment Calculator · First Home Buyer
Educational content, not financial advice. Rates and figures are illustrative and change regularly — confirm current numbers with a licensed New Zealand mortgage adviser or lender. Written by the MortgagePro Global team.