Loan structure 101: splits, offsets and why it matters

The single biggest predictor of how much you'll pay over a loan's life isn't the rate. It's the structure. Same rate, same lender, same amount; different structure can mean five or six figures over thirty years.

Offset accounts. A transaction account linked to your loan. Every dollar in offset reduces the loan balance interest is calculated on, while remaining fully accessible. $50k in offset on a $500k loan = you only pay interest on $450k. Equivalent to earning your loan rate, tax-free, on the offset balance. This is a general comparison only and is not tax advice. Speak with your accountant about your personal position.

Splits. Breaking one loan into two or more sub-accounts. Useful for: (a) part fixed, part variable (certainty plus flexibility), (b) separating tax-deductible debt from non-deductible debt (critical for investors), (c) keeping a clean line between owner-occupier and investment portions when you rent out a former home. This is a general comparison only and is not tax advice. Speak with your accountant about your personal position.

Repayment type. Principal & Interest pays down the balance and saves long-term interest. Interest-Only keeps repayments lower and is the right tool for some investors and people parking cash in offset rather than reducing balance. Tax treatment depends on your circumstances. Speak with your accountant about your personal position.

Loan term. Most loans default to 30 years. Refinancing usually resets the clock; make that decision deliberately, not by default. Sometimes a 25-year refinance at the same rate beats a 30-year refinance at 0.2% less.

The structural call that matters most for you depends on what you're doing in the next 3–5 years: buying another property, renting your home out, having kids, going self-employed. Loan structure should anticipate the next move, not just optimise for today.