Property Investment
2 min read
How are interest rates changing right now? September 2025

Property Investment
2 min read
Here is your monthly interest rate report.
This gives you a quick, plain English update on how much your mortgage costs.
TL;DR
For the past 2 or so months (July – August), interest rates basically stayed the same.
But over the last 4 weeks, rates start falling again.
The average 6-month rate fell 0.23% (compared to 0.04% in the prior month).
And the average 2-year rate fell 0.15% (compared to just 0.03% in the month before).
Late last month the Reserve Bank released a new OCR forecast. It now thinks it’ll take the OCR lower and for longer.
The market didn’t expect that. It was a surprise.
That shocked interest rate markets into action.
And that’s why the swap rates fell overnight.
That meant it was cheaper for banks to borrow money and lend it to you and me for our mortgages.
That’s how we get those new, lower interest rates.
Now, I have been thinking, ‘Are the banks holding out on us? ’
Since it’s costing them less to lend to you and me … are they hoarding margin? Are they keeping rates high just to make more money?
That’s not what I’m seeing.
Here’s the difference between ANZ’s 1-year and equivalent wholesale rates.
ANZ are basically at their 2-year average.
So it doesn’t look like they’ve saved up a lot of margin.
Don’t expect a new round of cuts before the new OCR announcement.
And that’s also why the discounts have dried up.
The average bank is advertising a 1-year rate of 4.75%.
Behind the scenes, they are only discounting this down to 4.72%. Not a lot at all.
Instead of doing back-room deals, the banks are just cutting their rates publicly.
Right now, investors and homeowners are making money moves to get a better deal.
Over the last week:
So if you’ve got an interest rate coming up … and want to make some mortgage moves …
let me know your situation.
I’ll come right back to you to see if my team can help.
Cheers,
Pete
Mortgage broker for over 10 years, property investor and Managing Director at Opes Mortgages
Peter Norris, a certified mortgage adviser with 10+ years of experience, serves as the Managing Director at Opes Mortgages. Having facilitated over $1.2 billion in lending for 2000+ clients, Peter is a respected authority in property financing. He's a frequent writer for Informed Investor Magazine and Property Investor Magazine, while also being recognized as BNZ Mortgage Adviser of the Year in 2018 and listed among NZ Adviser's top advisers in 2022, showcasing his expertise.