A $900,000 NZ mortgage is common for Auckland, Wellington, and coastal Bay of Plenty purchases. Here are exact repayment figures at current indicative rates across all common frequencies and terms.
On a $900,000 NZ mortgage at 5.50% over 30 years: weekly repayments are approximately $1,179, fortnightly $2,357, monthly $5,107. Total interest over 30 years would be approximately $939,000. A 25-year term increases repayments by about $420/month but saves approximately $181,000 in total interest.
Repayments on a $900,000 Mortgage Over 30 Years
| Rate | Weekly | Fortnightly | Monthly | Total interest (30 yr) |
|---|---|---|---|---|
| 5.20% | $1,141 | $2,282 | $4,943 | $879,690 |
| 5.50% | $1,179 | $2,357 | $5,107 | $939,640 |
| 5.80% | $1,219 | $2,437 | $5,281 | $1,000,650 |
| 6.20% | $1,271 | $2,542 | $5,512 | $1,084,400 |
| 6.50% | $1,312 | $2,625 | $5,688 | $1,148,200 |
Rates shown are indicative for planning purposes. As of April 2026, major NZ bank 1–2 year fixed rates are approximately 5.2%–5.8%. Check current rates on the NZ mortgage rates page.
Repayments on a $900,000 Mortgage Over 25 Years
| Rate | Weekly | Fortnightly | Monthly | Total interest (25 yr) |
|---|---|---|---|---|
| 5.20% | $1,238 | $2,476 | $5,367 | $710,100 |
| 5.50% | $1,275 | $2,550 | $5,527 | $758,750 |
| 5.80% | $1,313 | $2,625 | $5,690 | $807,300 |
| 6.20% | $1,364 | $2,727 | $5,910 | $873,100 |
| 6.50% | $1,403 | $2,806 | $6,079 | $923,700 |
Comparison at 5.50%:
- 30-year term: $5,107/month — total interest ~$939,640
- 25-year term: $5,527/month — total interest ~$758,750
- Saving by choosing 25 years: ~$180,890
Weekly vs Fortnightly vs Monthly
Fortnightly repayments are effectively 13 monthly payments per year — one extra per year — which reduces your loan term and saves significant interest.
On a $900,000 mortgage at 5.50%, switching from monthly to fortnightly repayments reduces the loan term by approximately 3–4 years and saves approximately $40,000–$50,000 in total interest.
Impact of Extra Repayments
An extra $200/week on a $900,000 NZ mortgage at 5.50% reduces the 30-year term by approximately 4 years and saves over $100,000 in interest.
Most NZ banks allow extra repayments on fixed-rate mortgages up to $500–$1,000/week without triggering a break fee. On revolving credit and floating facilities, unlimited extra repayments apply.
What Income Do You Need for a $900,000 Mortgage?
Under the RBNZ’s DTI 6× cap:
- Sole borrower: $150,000 gross annual income minimum ($900k ÷ 6)
- Joint borrowers: Combined gross income of $150,000
This assumes no other debt. Existing car loans, student debt, and credit card limits reduce this capacity. The bank’s serviceability stress test at approximately 7.5%–8.5% may also be the binding constraint.
What Does a $900,000 Mortgage Mean in Practice?
A $900,000 mortgage typically means a purchase in the $1,125,000–$1,350,000 range (with 20–30% deposit), or a lower-deposit purchase of a $1,000,000–$1,125,000 property using the First Home Loan or a 10% deposit.
This price range covers most of Wellington’s suburbs, Auckland’s townhouses and outer ring suburbs, and the premium end of Hamilton, Tauranga, and Nelson markets.
30 vs 25 vs 20 Year Term — Full Comparison at 5.50%
| Term | Monthly | Total interest | Monthly difference vs 30yr |
|---|---|---|---|
| 30 years | $5,107 | $939,640 | — |
| 25 years | $5,527 | $758,750 | +$420/month |
| 20 years | $6,057 | $594,800 | +$950/month |
Frequently Asked Questions
What are the monthly repayments on a $900,000 NZ mortgage?
At 5.50% over 30 years, approximately $5,107/month. At 6.0%, approximately $5,395/month. Use our mortgage repayment calculator for your exact rate.
How much interest do I pay on a $900,000 NZ mortgage over 30 years?
At 5.50%, total interest over 30 years is approximately $939,640 — meaning you pay close to double the loan amount in total. A 25-year term reduces this to approximately $758,750.
What income do I need to get a $900,000 mortgage in NZ?
Under DTI 6×: a minimum gross income of $150,000 per year (sole or combined). No other debt assumed. Student loans, car loans, and credit card limits reduce this capacity.
Is a $900,000 mortgage normal in NZ?
Yes — for Auckland and Wellington, a $900k mortgage on an average 3–4 bedroom home is common. The NZ median household income is approximately $110,000–$120,000, which is below the $150,000 needed for a $900k mortgage on a single income — hence the prevalence of two-income households in these cities.
Can I fix my $900,000 NZ mortgage and still make extra repayments?
Most NZ banks allow extra repayments of $500–$1,000/week on fixed-rate loans without triggering a break fee. Check your specific loan documentation. On revolving credit or floating portions, there is no limit.