Are Business Car Loans Cheaper Than Personal Car Loans?

A business car loan is often cheaper than a personal car loan — but not always because of the interest rate. The real difference is in the structure: tax deductions, GST credits, depreciation, and how the loan sits on your balance sheet. For a GST-registered sole trader buying a $50,000 ute, a chattel mortgage could save thousands more per year than a personal car loan at the same rate, once you factor in the tax treatment.

Why the interest rate isn't the full picture

Most comparisons focus on the headline rate. Personal car loans currently start from around 6.09% for a secured loan, while business car finance — structured as a chattel mortgage, hire purchase, or finance lease — starts from around 6.59% through Emu Money's panel of 50+ lenders.

On rate alone, personal loans can look cheaper. But rate is only one variable. The total cost of financing a vehicle depends on the loan structure, your tax position, whether you're GST-registered, and how much of the vehicle's use is for business. For anyone with an ABN, the after-tax cost is where business finance pulls ahead.

The structural differences that actually matter

Here's what separates a business car loan from a personal one — beyond the rate on the contract.

Ownership and security

With a chattel mortgage (the most common business car finance structure), you own the vehicle from day one. The lender holds a mortgage over it as security, but it's your asset on your balance sheet. That matters because it means you can claim depreciation from the moment you drive it away.

A personal car loan (secured) also gives you ownership, but the vehicle is security for the lender. The key difference: there's no depreciation claim, no GST credit, and no interest deduction unless you're using the vehicle for income-producing purposes and claiming via the logbook method.

GST credits

If you're registered for GST and you buy a vehicle using a chattel mortgage, you can claim the GST on the purchase price as an input tax credit on your next BAS. On a $55,000 vehicle (GST-inclusive), that's a $5,000 credit back in your pocket — often within weeks of the purchase.

For vehicles above the ATO car limit ($69,674 for 2025–26), the maximum GST credit is capped at $6,334 (one-eleventh of the car limit). But for most work vehicles under that threshold, you're claiming the full GST back.

With a personal car loan, there's no GST credit. You pay the full sticker price and that's it.

Interest deductions

On a business car loan, the interest you pay is tax-deductible — proportional to your business-use percentage. If your logbook shows 80% business use, you can deduct 80% of the interest as a business expense.

On a personal car loan, interest is not deductible — unless you're a sole trader claiming vehicle expenses via the logbook method, in which case you can deduct the business portion. But most personal borrowers aren't structured to do this.

Depreciation

A chattel mortgage lets you claim depreciation on the vehicle's cost (up to the ATO car limit of $69,674 for 2025–26). Depreciation is claimed over the vehicle's effective life — typically 8 years for a passenger vehicle — and reduces your taxable income each year.

For sole traders and small businesses with turnover under $10 million, the $20,000 instant asset write-off (for 2025–26) lets you immediately deduct the full cost of eligible assets under $20,000 in the year they're first used. For vehicles costing more than $20,000, the cost goes into the small business depreciation pool at 15% in year one and 30% each year after.

With a personal car loan, there's no depreciation claim at all.

Side-by-side comparison

When a business car loan makes sense

A business car loan is almost always the better option if:

• You have an ABN and use the vehicle more than 50% for business
• You're registered for GST — the upfront GST credit alone can be worth thousands
• You want to claim depreciation and reduce your taxable income each year
• You need a balloon or residual to keep repayments lower and free up cash flow
• You're buying a work vehicle — a ute, van, or dual-cab that's clearly for business

The sole trader question

Sole traders sit in an interesting spot. You can technically buy a car on a personal loan and still claim the business portion of expenses via the logbook method. But structuring it as a chattel mortgage is usually better because:

1. You get the GST credit upfront — not spread across BAS periods
2. Depreciation is cleaner — the vehicle sits on your balance sheet as a business asset
3. Interest is clearly deductible — no grey area about personal vs business use
4. You can include on-road costs — insurance, registration, and fit-outs can sometimes be rolled into the finance

The catch: you need to genuinely use the vehicle for business at least 51% of the time, and you need a logbook to prove it.

When a personal car loan makes sense

A personal car loan is the better choice if:

• You don't have an ABN — you're a PAYG employee buying a personal vehicle
• Business use is under 50% — you can't justify a chattel mortgage structure
• You want the simplest possible loan — no BAS, no depreciation schedules, no logbook
• You're buying a car purely for personal use — family car, weekend car, first car

Even if you're a sole trader, a personal loan might make sense for a second vehicle that's primarily personal. Don't overcomplicate your tax return for a vehicle that's 80% school runs and groceries.

The $20,000 instant asset write-off — does it help?

For the 2025–26 financial year, small businesses with turnover under $10 million can instantly deduct the full cost of eligible assets under $20,000. The threshold applies per asset, so you can write off multiple items in the same year.

For vehicles, this has limited direct impact — most cars cost more than $20,000. But it's useful for:

• Accessories and fit-outs priced individually under $20,000 (toolboxes, canopies, GPS units, signage wraps)
• Second-hand vehicles under $20,000 (older utes, runabouts for the yard)
• Trailers and small equipment purchased alongside the vehicle

For vehicles over $20,000, the cost goes into the small business depreciation pool. You'll claim 15% in the first year and 30% each year after — still a meaningful deduction, just not an immediate one.

What about the ATO car limit?

The ATO car limit for 2025–26 is $69,674. This is the maximum value you can use to calculate depreciation on a passenger car. If you buy a $90,000 SUV, you can only depreciate $69,674 of it.

The GST credit is also capped: the maximum you can claim is $6,334 (one-eleventh of $69,674), regardless of the vehicle's actual price.

This limit doesn't apply to vehicles designed to carry a load of one tonne or more (most utes and vans) or vehicles with 9+ seats. If you're buying a Toyota HiLux or a Ford Ranger for work, the full purchase price is depreciable.

How to decide

The decision comes down to three questions:

1. Do you have an ABN and use the car for business? If yes, a business car loan (chattel mortgage) will almost always cost less after tax — even if the headline rate is slightly higher.

2. Are you GST-registered? If yes, the upfront GST credit on a chattel mortgage is an immediate cash benefit that personal loans can't match.

3. Is the vehicle primarily for personal use? If yes, keep it simple with a personal car loan. Don't create a complex tax structure for a car that doesn't need one.

When in doubt, talk to your accountant before you sign anything. The right structure depends on your specific tax position — and getting it wrong can mean missing out on legitimate deductions or, worse, claiming something you shouldn't.

This article is general information only and is not financial advice.