The short answer
Is an offset mortgage worth using alongside a fixed loan?
An offset facility can reduce the interest charged on a linked part of your loan while keeping savings accessible. It makes most sense when you expect to hold enough eligible savings in the linked accounts to justify its pricing and fees. Many borrowers compare fixing most of the loan with offsetting only the amount they can realistically cover.
Match the offset portion to real cash
Suppose you usually keep $30,000 in eligible linked accounts. Offsetting a $30,000 loan portion may reduce interest on that portion while the cash remains accessible. If your balance falls, more of the offset loan attracts interest. A $100,000 offset portion does not become interest-free because you sometimes have $30,000 saved.
Some products allow family accounts to be linked; eligibility and account ownership rules vary. Check the lender's exact product terms and whether the linked savings would otherwise have earned interest.
Compare the cost of flexibility
The offset rate, fees and repayment terms may differ from a fixed loan. Compare the expected average savings balance, the fixed alternative and what you value about having cash available. A revolving credit loan is another flexible structure, but it behaves differently and requires careful spending discipline.
If you anticipate a large lump sum or changing income, splitting the mortgage can preserve options. The best proportions depend on the way you actually hold and spend money, not a standard percentage.
Review it when savings change
If most of your offset savings will be spent on a purchase, emergency or renovation, the interest benefit can shrink. Revisit the split when your savings, income or fixed terms change.
For your own situation
What to have ready
- Average balance likely to stay in linked accounts
- Offset interest rate and fees versus fixed terms
- Which accounts qualify and whether family accounts can link
- Extra repayment rules
- Planned use of the savings
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General information only. Rates, policies and eligibility can change. Personal advice depends on your circumstances and the terms actually available.