Offset Accounts vs Revolving Credit: The Key Difference
From Aaron’s YouTube: “revolving credit vs offset account #newzealand #firsthome #kiwisaver ##nzfirsthome #nzmortgage”
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Posted 5 July 2025
The short version
- Offset accounts let you link multiple savings accounts to offset mortgage interest, while revolving credit is one lump sum.
- With an offset account, your savings balance directly reduces the interest charged on the linked mortgage portion.
- Revolving credit requires all your funds to be in the single credit account to get the interest benefit.
- Not all banks offer both options - some have offset accounts, some revolving credit, and some neither.
How offset accounts work
An offset account links to your mortgage, acting like a savings account that reduces your interest payments. If you have a $900,000 mortgage with $60,000 in an offset account, you only pay interest on $840,000. That $60,000 could be spread across multiple accounts - savings, emergency fund, holiday fund - and the total still offsets your mortgage.
The key advantage is flexibility. You can organise your money how you like across different accounts while still getting the interest-saving benefit. Aaron notes this is particularly useful for people who like to mentally separate their funds for different purposes.
How revolving credit differs
Revolving credit works differently - it's essentially one big overdraft facility secured against your home. All your funds must sit in that single account to reduce the interest you're charged. If you split your money into separate accounts outside the revolving credit facility, you lose that benefit.
This can be restrictive if you like to segment your finances. As Aaron says, "you can't have one for savings, one for emergency fund, and one for a holiday" with revolving credit. All your available funds must be consolidated in one place to maximise the interest savings.
Bank options vary
Not all banks offer both options - some specialise in offset accounts, others in revolving credit, and some offer neither. Each bank will have their own branding for these products, which Aaron refers to as "fancy names".
The choice between these options depends on your financial habits. If you like multiple accounts for different purposes, an offset account likely works better. If you prefer consolidated finances, revolving credit may suit. Aaron acknowledges it can get complex, which is why he's created longer videos explaining these products in more depth.
This is general information, not personalised financial advice. For advice on your situation, talk to Aaron.
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