Short answer
A fixed loan provides repayment certainty for a chosen period. A floating loan provides flexibility but exposes you to rate changes. A split structure combines the two. The right structure depends on cash flow, future plans, repayment discipline, and risk tolerance—not on a rate prediction alone.
What is a fixed mortgage?
The rate stays fixed for an agreed term, which can make budgeting easier. Extra repayments, refinancing, or changing the loan early may be limited or may create a break fee under the contract. When the term ends, arrange a new rate or structure rather than assuming the old setting will continue.
What is a floating mortgage?
A floating rate can change during the loan. It may provide more flexibility for extra repayments or changes, but the lender's terms still matter. A higher or changing rate can increase repayments or extend the time needed to repay the balance.
Why split a mortgage?
A split structure places separate portions of the balance on different terms. One portion may provide repayment certainty while another remains flexible for a planned lump sum or irregular cash flow. Splitting creates more dates, balances, and conditions to track.
Worked example: Talia wants certainty, Chris needs flexibility
Talia has started a new higher-paid role and values predictable repayments while her household rebuilds its emergency savings. Chris runs a building business with seasonal cash flow and expects a large tax payment after a busy period. A mostly fixed structure may fit Talia's objective; a split or flexible component may be worth investigating for Chris. Neither example borrower has found the best structure in the abstract—their plans change the question.
What could change the answer?
A planned sale, renovation, inheritance, bonus, business tax payment, emergency-fund size, extra-repayment rules, break-fee exposure, fixed-term expiry dates, and income that is seasonal, commission-based, self-employed, or still in probation can all change the comparison.
How can a mortgage adviser help?
An adviser may compare structures across the lenders on their panel, explain conditions, and test evidence and timing questions. Ask which lenders are included, how the adviser is paid, and for disclosure information. MoreGage does not provide regulated financial advice or recommend a structure for an individual household.
Evidence categories to organise
- Purpose of each loan portion
- Rate and fixed period
- Repayment amount
- Extra-repayment rules
- Offset or revolving fees
- Fixed-term expiry dates
- Break-fee exposure
- Future cash events
This guide is general information only. MoreGage does not provide regulated financial advice, a lending assessment, approval, or an offer.