Mortgage Stress Test
See how rising mortgage rates would affect your repayments and whether you can afford the increase.
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This calculator shows what happens if your interest rate rises. In NZ, the Reserve Bank's Official Cash Rate directly influences mortgage rates — check the latest OCR before making decisions.
Extra cost per month
$684
+21.7% increase · +$8,211/year
Consider fixing part of your mortgage to lock in today's rate and reduce exposure to future rate increases.
| Current | Stressed | |
|---|---|---|
| Rate | 6.5% | 8.5% |
| Monthly repayment | $3,160 | $3,845 |
| Annual cost | $37,924 | $46,135 |
| Total over term | $1,137,722 | $1,384,045 |
How it works
Banks use a stress test rate (typically 6.5–7%) to check you could afford payments if rates rise. The test rate is higher than the actual rate to build in a buffer.