Car finance vs redrawing your home loan: which costs less

Buying a car often raises a genuine question if you already have a home loan with extra repayments sitting in redraw: use that redraw, or take out dedicated car finance instead. Both can work, but they behave quite differently once you look past the headline rate.

How each option actually works

Redrawing from your home loan means withdrawing extra repayments you have already made above the minimum, using them to fund the car purchase. You are not taking on new debt in a formal sense, you are simply using money that was sitting ahead in your existing loan, which then needs to be paid back down again like any other home loan balance.

Dedicated car finance is a separate loan, secured against the vehicle itself, usually with a fixed term (often three to seven years) and a fixed or variable rate specific to car lending, which is typically higher than a home loan rate because the security (a depreciating car) carries more risk for the lender than a house.

Where the trade-off actually lands

The interest rate on a home loan redraw is usually lower than dedicated car finance, which sounds like an easy win. The catch is repayment structure: if you redraw and do not deliberately pay that amount back down on a defined schedule, it can effectively stretch out over your remaining home loan term, which might be twenty or more years. Even at a lower rate, paying a car off over two decades can cost more in total interest than a five-year car loan at a higher rate.

Side-by-side comparison

Factor	Home loan redraw	Dedicated car finance
Typical interest rate	Usually lower	Usually higher
Repayment term	Open-ended unless you set a plan	Fixed, often 3 to 7 years
Total interest risk	Can be high if left unstructured	Predictable, tied to the fixed term
Effect on home loan buffer	Reduces available redraw funds	No effect on home loan
Best suited to	Disciplined borrowers who will set a repayment plan	Anyone wanting a fixed, self-contained payoff timeline

Making the redraw option work

If you do use redraw for a car, the option tends to work best when you treat it like a separate loan mentally: work out what a car loan repayment would look like over five years at a comparable rate, and consciously pay that same amount back into your home loan on top of your normal repayments. This captures the lower rate benefit without letting the cost quietly stretch across decades.

When dedicated finance is the simpler choice

If you would rather not manage that discipline yourself, or you want to preserve your home loan redraw buffer for emergencies or future extra repayments, dedicated car finance with a fixed term is often the more straightforward option, even at a higher headline rate. A broker who works across car and home lending can quote both paths side by side before you decide; our guide on how using a mortgage broker works explains what to expect from that conversation.

Do not overlook depreciation

A car loses value from the moment you drive it away, which is a factor worth weighing regardless of which finance path you choose. Structuring a car purchase against your home, an appreciating asset, over a very long, unstructured timeframe means you can end up owing considerably more than the car is worth for a stretch of that period. This is not necessarily a reason to avoid the redraw option, but it reinforces why setting a defined repayment plan matters more with a depreciating purchase than it might for other uses of redraw funds, such as renovations that could add value to the property itself.

A quick way to decide

If you already have strong repayment discipline and a clear plan to pay the amount down within a set number of years, redraw usually wins on cost. If you would rather the debt structure enforce that discipline for you, or you want your home loan redraw kept free for other purposes, dedicated car finance is the simpler and often safer default, even though it costs a little more in interest.

If you want to compare structured car finance options locally, our car finance and loan specialists can talk through both paths, and our scoring method explains how we assess them. You can also browse the wider directory if you want more options.