Financing a car vs paying cash.
Cash costs you interest you never pay. Finance costs you a buffer you get to keep. Both are defensible, and the numbers only settle half of it.
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Overview
The short version.
Paying cash and financing a car are both reasonable ways to buy in New Zealand, and neither is universally right. Paying cash avoids all interest, so the car costs its sticker price and nothing more. Financing spreads the cost over a fixed term and keeps savings intact, but it adds interest across the loan, so the same car costs more in total.
The trade-off isn't only about the dollar cost of the interest. It also weighs the value of keeping cash available for emergencies against the certainty of owning the car outright. Depreciation happens either way, whichever route you take.
What the numbers can settle is the interest. What they cannot settle is how much a cash buffer is worth to you, and that's usually the half of the decision that decides it. All of this is general education rather than advice about any particular purchase.
In short
The key points.
- Paying cash avoids interest entirely, so the car costs its price and nothing else. Financing adds the total interest across the term on top of that price.
- On a $20,000 car at an assumed 8% over five years, financing the lot adds indicative total interest of roughly $4,300. That is the real premium for spreading the cost.
- Keeping your cash rather than spending it leaves you an emergency buffer, which is the thing most people weigh against the interest they would have saved.
- A secured car loan is usually priced below an unsecured personal loan, so what financing costs depends heavily on which structure and rate you can actually get.
- Part cash and part finance is the common middle path, cutting the interest while leaving some cash on hand rather than picking one extreme.
The cost of borrowing
The real cost of financing a car
The clearest argument for cash is that it avoids interest completely. A car bought outright costs its price and nothing else, so a $20,000 car costs $20,000. Finance the same car and the price gets spread over a fixed term with interest charged on the balance owing, so what you pay in total lands above the sticker. That gap is the real cost of borrowing, and it reads very differently as one number than it does as a comfortable weekly figure.
How big that gap is comes down to the amount, the rate and the term. On the $20,000 car at an assumed 8% over five years, indicative repayments land around $94 a week and indicative total interest is roughly $4,300. Stretch the same car over a longer term and the weekly payment drops while the total interest climbs, because the balance carries a finance charge for longer. A shorter term does the opposite. Every figure here is indicative and based on the inputs shown, not a quote or an offer of credit.
This is why total cost of credit, the interest plus every fee across the full term, is the number that captures what financing really adds. Moving the amount, rate and term in the calculator above updates the weekly cost and the total interest together, which puts the premium for spreading the cost right next to the alternative of paying it all at once.
The case for cash on hand
Liquidity and the opportunity cost of paying cash
Paying cash removes the interest and empties the account it came from, and that's the counter-argument. Money spent on a car isn't there for an unexpected bill, a gap between jobs, or anything else that arrives without warning. Draining savings to buy outright can leave you asset-rich and cash-poor, with a paid-off car in the driveway and very little behind you if next month goes badly.
That is the liquidity case for financing. Keeping the buffer intact and spreading the car over a fixed term preserves the flexibility cash gives you, and the interest is what that flexibility costs. If an outright purchase would consume nearly all your savings, that flexibility can be worth more than the interest. If you have plenty left over beyond the car, paying cash leaves the buffer untouched and the interest saved is close to a pure gain.
There is an opportunity-cost angle too, though it's a shakier one. Money not spent on a car can sit in savings, offset a mortgage or go somewhere else entirely, and whether that beats the loan rate depends on returns nobody can promise you. The steadier point is the buffer itself. Plenty of people value having cash reachable for the unexpected, quite separately from any question of what it might earn.
Either way
Depreciation happens whether you finance or pay cash
One thing doesn't change with the payment method. The car depreciates either way. A car bought outright and a car bought on finance track the same market value, because depreciation belongs to the car and the market, not to how you paid. Cash does not protect you from the fall, and finance does not speed it up.
What the payment method changes is how the loan sits against that value. Pay cash and you own the car from day one, so the falling value is just a falling asset with no debt behind it. Finance it and you owe a balance falling on its own schedule, and in the first year or two the car can be worth less than the loan against it. That position is negative equity. A car typically loses more of its value in its first year than in any year after it, though how much depends on the make, model and condition.
So depreciation is a shared cost of owning a car rather than a point of difference between the two routes. Where it does bite differently is on a financed car sold or written off early, because the shortfall between the payout and the market value has to be cleared by someone. Pay cash and that gap can't open, because there's no loan sitting behind the value.
Which loan
Secured rates are usually lower than unsecured
If financing is on the table, its cost isn't one number, because it depends heavily on which loan. A secured car loan holds the car as security, registered on the Personal Property Securities Register, and because the lender has an asset to fall back on the rate usually sits below a comparable unsecured personal loan. An unsecured loan used to buy a car has nothing registered over it, so the rate is higher to cover the lender's risk.
That matters a lot when you are comparing financing against cash. A few percentage points on the rate moves the total interest, which moves the whole premium. Broadly, secured car loans here commonly sit around 8 to 13% depending on you and the car, while unsecured personal loans run higher. Those are indicative ranges rather than quotes, and your actual number depends on your credit record, your deposit, the term and the lender.
So financing isn't one option with one cost. Weighing finance against cash on a mainstream car usually means comparing against a secured rate, which narrows the gap. The same comparison against an unsecured rate widens it. Which structure applies is worth pinning down before the numbers go anywhere.
- A secured loan holds the car as security, which usually lowers the rate and shrinks the interest premium over paying cash.
- An unsecured personal loan puts nothing up as security, so the higher rate widens the gap against buying outright.
- The rate a buyer can access, not just the choice to finance, drives how much financing costs relative to cash.
The middle path
A part-cash deposit plus finance
The choice is rarely all one or all the other. The common middle path is part of the price in cash as a deposit and the rest financed, which picks up some of the benefit from each side. The deposit cuts what you borrow, so less interest accrues, and the savings you keep stay available as a buffer rather than being locked into the car.
The mechanics are simple enough. On the $20,000 car at an assumed 8% over five years, financing the lot carries indicative total interest of roughly $4,300. Put $4,000 down and the financed balance drops to $16,000, trimming that indicative interest by roughly a fifth, on top of the $4,000 that never carries a finance charge at all. A bigger deposit cuts the interest further and leaves you less cash. A smaller one does the reverse. All indicative, and based on the inputs shown.
Lenders tend to like this shape too, because a deposit lowers the loan-to-value ratio and their exposure, which commonly improves the indicative rate, subject to their credit assessment. So for a lot of people the real question is not cash or finance at all. It is where to put the split so the interest cost and the cash buffer both land somewhere they can live with. The calculator will model any deposit against the same car and show you where that falls.
Weighing it up
How the right answer depends on the buyer
There is no single correct answer here, because the inputs change from person to person. The interest saved by paying cash is real and easy to count. The value of keeping a buffer is just as real and much harder to put a number on, because it depends on how close to the edge an outright purchase would leave you. Both belong in the decision, and neither is obviously the winner.
Three things tend to swing it. How much sits in savings beyond the car, because a buffer that survives the purchase changes the whole calculation. The rate on offer, since a low secured rate makes finance cheap to carry and a high unsecured rate makes it expensive. And plain priority, because some people put a high value on owning the car free of any debt, and others would rather keep the cash working somewhere else.
Most people land in the middle, putting down a deposit they're comfortable parting with and financing the rest at the best rate they can get. The calculator above makes the interest side of that trade concrete. The buffer side is a judgement no tool can make for you. The one thing that holds across every version of this decision is that the numbers, rather than a rule of thumb, are what show you the cost of each route.
Common questions
Financing a car vs paying cash FAQ.
Is it better to finance a car or pay cash in New Zealand?
Neither is universally better. Cash avoids all the interest. Finance keeps your savings available as a buffer and charges you that interest for the privilege. Which fits depends on how much you've beyond the car, the rate you can get, and how much owning it outright is worth to you.
How much does financing a car actually cost compared to paying cash?
The extra cost is the total interest plus fees across the term. On a $20,000 car at an assumed 8% over five years, indicative total interest is roughly $4,300, so financing costs about that much more than paying cash. The figure moves with the rate, the term and any deposit.
Why would someone finance a car if they can afford to pay cash?
Mainly to keep the cash. Buying outright can leave you with very little emergency buffer, so plenty of people finance the car and hold the savings for whatever turns up. Whether that's worth the interest depends on how big your buffer would be either way.
Does paying cash for a car avoid depreciation?
No. A car loses value the same way whether you paid cash or financed it, because depreciation belongs to the car and the market rather than to your payment method. Paying cash means you own a falling asset with no debt behind it. It doesn't stop the fall.
Is a part-cash deposit plus finance a good middle ground?
It is the most common approach. A cash deposit lowers the amount financed, which cuts the interest, while the savings you keep stay available as a buffer. A deposit also lowers the loan-to-value ratio, which commonly improves the indicative rate, subject to the lender's assessment.
Does the type of car loan change the finance-versus-cash comparison?
Yes, quite a lot. A secured car loan is usually priced below an unsecured personal loan, so the interest premium over paying cash is smaller. Pinning down which structure applies before you compare against cash keeps the numbers honest.
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Last reviewed: 31 July 2026
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