Extra repayments, offset and redraw: getting ahead of the loan

Moneysmart's guidance states the key fact plainly: in the early years of a home loan, most of each repayment goes to interest, not the debt itself. The balance is at its largest, so the interest bill is at its largest, so the sliver actually shrinking the loan is at its smallest. Standard amortisation — and quietly brutal.

Which is exactly why extra payments made early are so disproportionate: a dollar of extra repayment goes entirely to principal, and every dollar of principal removed stops charging interest every year for the rest of the loan. As Moneysmart puts it, extra payments during the early period reduce the interest you pay across the whole life of the loan.

The mirror image also matters: the same extra dollar in year twenty-five saves far less, because there are fewer interest-charging years left for it to cancel. Getting ahead of a mortgage is a young-loan game most of all — and the calculator below puts exact numbers on your own version of it.

Extra repayments are the direct route: pay more than the required amount — a regular top-up, or lump sums like a tax refund or bonus, which Moneysmart suggests putting straight into the mortgage. The money leaves your hands and the balance drops, immediately and simply.

Redraw is the direct route with a partial undo button: a facility giving you access to the extra you've paid in, if you need it back. The catch is in Moneysmart's careful wording — how and when you can access it depends on your loan's terms. Redraw is a feature of the loan, on the lender's conditions, not a bank account of yours.

Offset gets ahead without repaying at all: a transaction account linked to the loan whose balance reduces the amount your interest is calculated on — a $500,000 loan with $20,000 offset pays interest on $480,000, in Moneysmart's own example. The money stays fully yours, fully at call, while working against the loan. It's the richest of the three mechanisms and has its own page: Offset accounts.

Arithmetically, a dollar in the offset and a dollar of extra repayment do near-identical work on interest. The differences are about access and terms. Offset keeps the money unconditionally yours — the natural home for a buffer — but offsets generally ride on variable loans, and feature-rich loans can charge for the privilege. Redraw locks the money behind the loan's conditions; fine for genuinely surplus cash, wrong for the emergency fund.

Two caps to check before committing. Fixed loans usually restrict or cap extra repayments during the fixed term — Moneysmart's choosing-a-home-loan guidance flags it, and breaching the cap can trigger fees. And redraw terms (minimums, fees, approval, the lender's ability to change access) live in your loan contract, not in your assumptions — read them before you rely on them.

One structural nuance deserves its licensed-advice flag: for investment properties, the choice between offset and paying down the loan can have real tax consequences later. If a property might ever become an investment, that choice is worth professional advice before, not after.

The mechanics of sticking with it are the same payday automation this site keeps prescribing: a standing extra amount paid with each repayment, sized so you never renegotiate it with yourself. Small and permanent beats heroic and abandoned — and the calculator below will show you how little "small" needs to be to matter.

Give windfalls a default destination too: Moneysmart's own example is the tax refund straight into the mortgage. And revisit the number at every rate change — when rates fall and your required repayment drops, keeping your repayment unchanged converts the entire cut into extra principal without your budget feeling anything. It's the least painful extra repayment that exists.

Two boundaries keep it healthy. Don't starve the essentials to feed the loan — the buffer comes first, because a mortgage prepaid at the cost of an empty buffer gets refinanced backwards at card rates when the car dies. And remember the loan isn't the only bidder for spare dollars: expensive debts win first (see Getting out of debt), and long-horizon investing has its own claim (Investing basics). Ahead-of-the-loan is a strategy, not a religion.