A fixed-rate mortgage locks your interest rate for a set period, usually one to five years in Australia, so repayments stay identical while the fixed term runs. When the term ends the loan reverts to the lender’s variable rate unless you refinance or fix again.
This guide explains how Australian fixed terms work, what they protect against, where they cost you flexibility and how to decide between fixing, staying variable or splitting.
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How an Australian fixed term works
The lender prices the fixed product when you take it: that price holds regardless of what markets do afterwards, which is why knowing your exact repayment simplifies budgeting for the whole fixed window. Fixed periods typically run one to five years before reverting to the lender’s variable rate, which may sit higher or lower than the fixed deal you enjoyed. A few lenders offer decade-long fixes at much steeper interest rates, but the thirty-year certainty American borrowers know does not exist as a standard Australian product.
What fixing protects, and what it costs
Certainty is the core benefit: knowing the exact repayment keeps household budgeting honest and shields cash flow from rate increases during the fixed window. The trade-offs are contractual:
- Extra-repayment caps: most fixed products limit additional repayments, capping how much extra you can pay each year without penalty.
- Break costs: exiting early, whether by selling, paying out or refinancing, can trigger substantial fees because the lender hedged its own position on your loan.
- Limited offset: full offset accounts are rare on fixed products, so spare cash earns little sitting idle.
Those constraints bite hardest when circumstances change: Refinancing out of a fixed term to access features or better pricing means wearing break costs calculated against wholesale swap positions taken years earlier.
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Fixed versus variable versus split
Variable rates move with lender funding costs and the Reserve Bank‘s cash rate, currently holding at 4.35% after the August 2026 meeting. Note the direction of causation for clients: a cash-rate change affects variable repayments, but it never alters a repayment already locked in a fixed term. Split loans divide the balance between a fixed portion and a variable portion, letting borrowers hedge both directions while keeping some offset and extra-repayment capacity alive.
A practical decision frame: borrowers who need payment certainty within a tight budget suit longer fixed terms; those expecting to sell, renovate heavily or pay down fast suit variable; households torn between the two often resolve the tension with a split. Serviceability testing also matters here, since APRA-regulated lenders assess new borrowing with a three percentage point buffer above the applied rate regardless of which structure you pick.
Why Australia has no thirty-year fix
American lenders can sell thirty-year fixed loans into a deep government-backed secondary market; Australia’s residential mortgage-backed securities market exists but offers no equivalent long-dated buyer of thirty-year rate risk. Local lenders would carry that risk on their own books for decades, which is why nobody prices it competitively and why borrower demand has historically favoured shorter terms anyway.
Advice conversations worth having now
- Diary every client’s revert date and book a review call six weeks before it lands, because revert rates are set unilaterally and rarely favour the borrower.
- Check each fixed product’s extra-repayment cap and break-cost formula against the client’s realistic plans before recommending it.
- For investors, confirm current deductibility treatment rather than assuming old rules still apply: negative-gearing reform is law, salary-offset treatment runs until 30 June 2027, and from 1 July 2027 many established dwellings face tighter deductibility, with grandfathering keyed to contracts from 7:30 pm AEST on 12 May 2026.
Mortgage brokers carry these conversations well because the products differ more in their fine print than their headline rates. Two external factors deserve mention in client discussions: state-based concessions such as stamp duty discounts for eligible buyers can tip affordability calculations, and long-term plans should drive the choice between structures, since a borrower moving house within two years pays break costs no matter how attractive the fixed rate looked.
Investors use fixed rates differently again: locking repayments on investment property loans stabilises cash flow across a portfolio and makes interest expenses predictable for tax planning, subject to the deductibility changes above. Market direction shapes the calculus too: rising-rate environments make fixes attractive insurance while a declining market rewards variable flexibility, though predicting either reliably is beyond anyone.
If you have clients inside eighteen months of a revert date, list them this week with their revert rates and target replacement products, then start those reviews early. Revert dates are the single most predictable advice opportunity in a brokerage calendar, and they arrive whether or not anyone diaries them.
