Why ABN Holders Can Get Cheaper Cars in Australia

ABN holders can get cheaper cars in Australia because financing a vehicle through your business unlocks GST credits, tax-deductible interest, and depreciation claims that personal buyers don't get. On a $60,000 vehicle, these benefits can reduce the real cost by $15,000 to $25,000 over five years.

Why business buyers pay less for the same car

Around 38% of new vehicles sold in Australia are registered to businesses, according to the Federal Chamber of Automotive Industries. That's not a coincidence. Business buyers aren't getting a secret discount at the dealership — they're paying the same sticker price as everyone else. The difference is what happens after the purchase: the tax system effectively subsidises the cost of vehicles used for business purposes, and those savings compound every year you own the car.

The GST credit: an instant price cut

If you're registered for GST and you buy a vehicle using a business car loan structured as 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 $5,000 back — effectively reducing the purchase price to $50,000 before you've even made a repayment. For a vehicle priced at $66,000, the credit is $6,000.

The credit is capped at the ATO car limit. For the 2025–26 financial year, the limit is $69,674, which means the maximum GST credit is $6,334 (one-eleventh of the car limit). Vehicles designed to carry loads of one tonne or more — most utes, vans, and commercial vehicles — are exempt from the cap, so you can claim the full GST regardless of price.

Personal car buyers don't get this. If you buy the same $55,000 vehicle on a personal loan, you pay $55,000. No credit, no reduction, no BAS claim. That $5,000 gap is real money — it's the difference between a base model and one with the features you actually need.

Interest deductions: reducing the cost of borrowing

On a business car loan, the interest you pay is tax-deductible in proportion to your business use. If your logbook shows 75% business use and you pay $4,800 in interest over the year, you can deduct $3,600 as a business expense.

At a marginal tax rate of 32.5% (the rate for income between $45,001 and $135,000 in 2025–26), that $3,600 deduction saves you $1,170 in tax. Over a 5-year loan, interest deductions alone can return $4,000 to $6,000 — depending on your rate, loan amount, and business-use percentage.

Personal buyers can't deduct interest at all. Even if you're a PAYG employee who drives to client sites every day, the interest on a personal car loan is not tax-deductible. The only exception is sole traders using the logbook method — but at that point, you'd almost certainly be better off with a chattel mortgage structure anyway.

Depreciation: claiming the vehicle's declining value

When you finance a car through your business, you can claim depreciation on the vehicle's cost — up to the ATO car limit of $69,674 for 2025–26. The ATO sets the effective life of a passenger car at 8 years, which translates to a 12.5% diminishing value rate per year.

How depreciation works in practice

On a $60,000 vehicle with 80% business use:

• Year 1: $60,000 × 25% (first-year diminishing value) = $15,000 × 80% = $12,000 deduction
• Year 2: $45,000 × 12.5% = $5,625 × 80% = $4,500 deduction
• Year 3: $39,375 × 12.5% = $4,922 × 80% = $3,938 deduction

Over 5 years, total depreciation deductions on this vehicle exceed $28,000 before applying the business-use percentage. At a 30% company tax rate, that's more than $6,700 in tax savings from depreciation alone.

The small business depreciation pool

If your business has turnover under $10 million, you can use the simplified depreciation rules. Vehicles go into the general small business pool, where you claim 15% in the first year and 30% each year after. For a $60,000 vehicle, that's $9,000 in year one and $15,300 in year two — front-loading your deductions when cash flow matters most.

The $20,000 instant asset write-off (2025–26) applies to assets under $20,000 each. Most vehicles exceed this threshold, but it's useful for accessories purchased separately — toolboxes, canopies, GPS systems, and signage wraps can each be written off immediately if individually under $20,000.

Personal car buyers get none of these deductions. The vehicle sits on your driveway and loses value every year, with no tax offset for the decline.

The compounding effect: how savings stack up

Each of these benefits works independently, but they compound when you add them together. Here's how a $60,000 vehicle looks over 5 years for an ABN holder versus a personal buyer — assuming 80% business use, a chattel mortgage at 7.5%, and a marginal tax rate of 32.5%.

That's a $25,000 difference on the same car, bought from the same dealer, at a similar interest rate. The ABN holder's effective cost of ownership is closer to $35,000 than $60,000.

This is why business vehicle registrations remain high even when interest rates rise. The tax treatment more than compensates for any rate premium on a business car loan compared to a personal loan.

Running costs are deductible too

The savings don't stop at the purchase. Every ongoing cost associated with running a business vehicle is deductible in proportion to business use:

• Fuel and oil
• Registration and insurance
• Servicing and repairs
• Tyres
• Tolls and parking (business-related)
• Car wash (if used for client-facing work)

For a vehicle costing $6,000 per year to run at 80% business use, you're deducting $4,800 annually. At a 32.5% marginal rate, that's $1,560 back in tax every year — or $7,800 over a 5-year ownership period.

Personal buyers absorb these costs entirely. No deductions, no offsets, no BAS claims.

What you need to qualify

To access these savings, you need to meet a few requirements:

• A registered ABN — active and trading. Lenders treat ABN age as a key risk factor; 2+ years of ABN and GST registration gets you the best business car loan rates.
• GST registration — required to claim the GST credit. If your turnover is above $75,000, you must be registered. If you're under the threshold but close, registering voluntarily can open up better finance and the GST credit.
• A logbook — the ATO requires a logbook kept for a minimum continuous 12-week period to substantiate your business-use percentage. Without it, you can't claim proportional deductions.
• Genuine business use — the vehicle must be used primarily for business. A car that's 90% school runs and weekend trips won't pass an ATO review, even if it's financed under your ABN.

If you're already running a business with an active ABN and GST registration, you likely qualify. The question isn't whether you can access these benefits — it's whether your current vehicle finance structure is set up to capture them. Many sole traders buy cars on personal loans out of habit, missing thousands in deductions every year.

The logbook: your proof of savings

The ATO logbook method requires you to track every trip in the vehicle for a continuous 12-week period. You record the date, odometer reading, kilometres driven, purpose of the trip, and whether it was business or personal.

Once your logbook period is complete, the business-use percentage you calculate applies for up to 5 years — or until your circumstances change significantly. A logbook showing 75% business use means 75% of every deductible expense flows through to your tax return.

Digital logbook apps have made this easier than it used to be. Most connect to your phone's GPS and automatically categorise trips. The ATO accepts digital records as long as they meet the same data requirements as a paper logbook.

The effort is minimal. The payoff — validated business-use deductions worth thousands per year — is significant.

Common mistakes that cost ABN holders money

Buying on a personal loan when you have an ABN

This is the most expensive mistake. A personal car loan means no GST credit, no interest deductions, and no depreciation claims through the business. Even if the personal loan rate is 0.5% lower, the tax benefits of a chattel mortgage will save you multiples of that rate difference.

Not keeping a logbook

Without a valid logbook, the ATO can deny your business-use claims entirely. Some sole traders estimate their business use without documentation — this is a common audit target. Twelve weeks of logging trips protects years of deductions.

Financing above the car limit without knowing the cap

The ATO car limit ($69,674 for 2025–26) caps the depreciable amount and the GST credit for passenger vehicles. If you're buying a $90,000 SUV, you can only depreciate $69,674 of it. Vehicles over one tonne carrying capacity (utes, vans) are exempt from the cap — so if you're choosing between a large SUV and a dual-cab ute at a similar price, the ute may deliver better tax outcomes.

Ignoring the structure

A chattel mortgage, hire purchase, and finance lease each have different tax treatment. The wrong structure for your situation can mean delayed GST credits, different depreciation timing, or missed deductions. Talk to your accountant before signing — the structure decision is worth more than the rate negotiation.

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