24/09/2026
Something to think about for managing your money
We haven't paid the full interest rate on our mortgage(s) in years. It's not a trick, it's an offset account, and many Kiwis don't realise their bank probably already offers one.
An offset account is a savings account (or multiple accounts) linked to your home loan. The bank subtracts your savings from your loan balance before calculating interest. So on a $400k loan, you might have $350k on fixed and $50k on floating, and if you've got $50k in savings sitting in offset, you'd pay zero interest on that $50k chunk.
Here's what that looks like on one of our loans right now: we're offsetting 84% of a ~$30k portion. That drops our effective rate from 5.94% floating down to 0.92%.
Our goal is always 100% offset, so we pay zero interest on that portion. We're a bit under right now after some tax payments came out, but that's what we work back towards.
Across our whole property portfolio we owe just over $600,000, split into lots of different chunks, mainly fixed across multiple terms, some floating and offset.
It's also a big part of how our budgeting system works. Our BNZ Total Money loan lets us offset up to 50 accounts, so our blow money, bills, groceries, many many sinking funds, and emergency fund all sit in separate accounts, each doing its own job, while all offsetting the mortgage.
A few things to know:
🔸 Only float and offset what you can actually cover with savings - you need to have cash in the bank for this to work
🔸 Some banks charge a monthly fee for the facility (ours is refunded through a loyalty package)
🔸 You can usually make lump sum repayments anytime, penalty-free.
BNZ, Westpac and Kiwibank all offer offset accounts if you want to see how it stacks up for your loan. Others offer revolving credit which is more like a giant overdraft and not how I like to manage my money but it can suit many people.
Do you use an offset account? Link's in the comments if you want the full breakdown 👇