If you run a business, drive for work, or operate as a sole trader, the way you finance a car matters more than most people realise. An ABN car loan isn't just a standard car loan with a different name — it opens up a set of tax advantages and product structures that personal borrowers simply can't access.
This guide covers everything: what an ABN car loan actually is, what you can claim, how the numbers work, and what to watch out for.
What is an ABN car loan?
An ABN car loan is a business-purpose car loan taken out by an ABN holder — that includes sole traders, tradies, consultants, company directors, and any registered Australian business.
The key difference from a personal car loan is purpose: the vehicle is used for income-producing activities. That purpose unlocks three categories of tax advantage that personal borrowers don't get.
It also means the loan sits outside the National Consumer Credit Protection Act (NCCP) — the legislation that governs consumer lending. This isn't a loophole. It's by design: business borrowers are treated as sophisticated enough to assess their own risk, so lenders don't need to hold your hand through the same disclosure process. The practical effect is faster approvals, more flexible structures, and products that wouldn't pass muster in the consumer space.
The three tax advantages of an ABN car loan
1. GST input tax credit (Year 1)
If you're registered for GST, you can claim back the GST component of your car purchase price in the year you buy. On a $60,000 car (including GST), that's $5,454 back in your first BAS — regardless of whether you paid cash or financed it.
The only conditions: you must be GST-registered, and the vehicle must be used for business purposes. If you use the car 80% for business, you claim 80% of the GST. Simple.
Most business owners claim GST on equipment without thinking twice. A car is no different — but many sole traders don't realise they can claim it.
2. Loan interest deduction (every year)
The interest component of your car loan repayments is tax-deductible — proportional to your business use percentage. On a $60,000 loan at 7.14% over 5 years, you'll pay roughly $11,400 in total interest. At 100% business use and a 30% tax rate, that's around $3,420 off your tax bill over the loan term.
At a 47% marginal rate (the top bracket), the same loan saves $5,358 in tax on interest alone.
3. Depreciation deduction (every year)
The ATO allows you to depreciate the business-use portion of your vehicle each year. There are two methods:
- Diminishing value (DV) — 25% p.a.: You claim 25% of the car's remaining book value each year. Larger deductions early, tapering off over time. This is the ATO default for most motor vehicles (effective life: 8 years).
- Prime cost — 12.5% p.a.: You claim the same dollar amount each year. More predictable, better for cashflow planning.
On a $60,000 car (ex-GST base: $54,545), the Year 1 diminishing value deduction is $13,636. At 30% tax rate that's a $4,091 tax saving in the first year alone.
| Year | DV Deduction (100% business) | Tax saved @ 30% | Tax saved @ 47% |
|---|---|---|---|
| Year 1 | $13,636 | $4,091 | $6,409 |
| Year 2 | $10,227 | $3,068 | $4,807 |
| Year 3 | $7,670 | $2,301 | $3,605 |
| Year 4 | $5,753 | $1,726 | $2,704 |
| Year 5 | $4,314 | $1,294 | $2,028 |
Combined with GST and interest deductions, the total tax benefit on a $60,000 business car loan over 5 years can exceed $17,000 at a 30% rate — or over $27,000 at 47%.
What loan structures are available to ABN holders?
Business borrowers have more options than personal buyers. Here are the main structures:
Standard business car loan
A fully amortising loan — you pay down principal and interest every week or month, and own the car outright at the end. No balloon. Straightforward. Higher weekly payments, but you exit the loan with equity.
Chattel mortgage
A chattel mortgage is the most common ABN car loan structure in Australia. You take ownership of the vehicle immediately, but the lender holds a "mortgage" (security interest) over it until the loan is paid. You can claim GST upfront, and depreciation and interest are deductible. Often used with a balloon payment at the end.
Finance lease
The lender buys the car and leases it to you. You make regular payments, and at the end you can pay a residual to own it, extend the lease, or hand it back. You don't technically own the car during the lease, which affects how depreciation is claimed (the lessor claims it, not you).
Balloon/GFV loan for business
A car loan with a portion of the principal deferred to the end as a balloon — reducing your weekly repayments during the term. Dealer GFV products typically defer 30–40% of the car's value. That makes weekly payments look very affordable, but the end-of-term balloon is often too large to pay, trapping borrowers in a refinance cycle.
The problem with GFV balloon loans for business owners
GFV loans are heavily marketed to ABN holders and tradies — "low weekly payments, and you can just hand the car back." Dealers love them because they can sell you a more expensive car (lower weekly payment = easier to justify the price) and they get you back in 3–5 years for another sale.
The reality for most business owners:
- The balloon at the end is typically 30–40% of the original car price — on a $60,000 ute, that's $18,000–$24,000 you either have to pay, refinance, or forfeit.
- If you hand the car back, you walk away with zero equity. Years of payments, nothing to show.
- If you refinance the balloon, you restart the interest cycle on that residual — paying interest on interest.
- The tax deductions are real, but they don't change the fundamental problem: at term end, you're broke or in debt again.
A tradie paying $320/week on a GFV ute for 5 years has paid $83,200 in repayments. At the end they face a $24,000 balloon. Most hand the car back. They've been renting it for 5 years and didn't even know it.
What to look for in an ABN car loan
When you're comparing business car loans, the weekly payment is the least useful number to compare. What actually matters:
- Total cost of ownership — all repayments plus balloon, minus any equity you actually receive at the end
- End-of-term position — do you own the car? Do you have equity? Can you sell it and keep the proceeds?
- Tax deductibility of the structure — is the interest deductible? Can you claim GST? Which depreciation method suits your income profile?
- Establishment and ongoing fees — some lenders charge $500–$1,000+ in upfront fees that aren't included in rate comparisons
- Balloon size — a 10% balloon is manageable. A 40% balloon is a trap.
How Milam works for ABN holders
Milam is a car finance product built specifically for ABN holders and businesses — and it's structured to address exactly the problem above.
Milam lends on a fixed 10% balloon — significantly smaller than a standard GFV product. Your weekly payments are still lower than a fully amortising loan (because 10% of the principal is deferred), but the balloon at the end is designed to actually be paid, not rolled over.
The other part of the structure is the Maturity Rebate: if your total Milam cost (weekly repayments plus the 10% balloon) ever exceeds what a standard fully-amortising loan on the same amount and rate would have cost, Milam refunds the difference directly against your balloon. This is a contractual guarantee — you never pay more in total than you would on a standard loan.
The result: lower weekly payments during the term, a manageable balloon at the end, and you exit the loan owning the car outright — with the equity intact to keep, sell, or use toward your next vehicle.
All the same tax advantages apply: GST input tax credit in Year 1, annual interest deductions, and full ATO depreciation — Milam currently lends to ABN holders and registered businesses.
See your ABN car loan numbers
Plug in your loan amount, rate and term — and see exactly what the tax deductions, weekly payments and end-of-term equity look like for your situation.
Calculate my numbers →Frequently asked questions
Do I need to use the car 100% for business?
No. You claim deductions proportional to business use. If you use the car 70% for business, you claim 70% of the interest, 70% of the depreciation, and 70% of the GST. The ATO requires you to keep a logbook for 12 continuous weeks to establish your business use percentage, then you can apply that percentage to future years.
Can a sole trader get an ABN car loan?
Yes. Sole traders with an active ABN are eligible for business car loans and all associated deductions — you don't need to be a company or trust. You do need to be using the vehicle for income-producing purposes.
What's the difference between a chattel mortgage and a business car loan?
Technically, most business car loans are structured as chattel mortgages — the terminology is used interchangeably by most lenders. The distinction matters for accounting treatment and how depreciation is claimed, but from a borrower's perspective they behave identically.
Can I claim the full GST in Year 1 even if I'm financing the car?
Yes. The GST input tax credit is based on the purchase price of the vehicle, not on how you paid for it. Whether you paid cash or financed 100%, you claim the full GST component (proportional to business use) in the BAS period when you purchased the car.
What happens to depreciation when I sell the car?
When you sell a business-use vehicle, any gain above the written-down book value is taxable — this is called a balancing charge. It's not unique to any loan type; it applies to all business asset disposals. Your accountant can help you time the sale to minimise the impact.
Tax figures in this article are illustrative only and based on ATO motor vehicle effective life of 8 years (diminishing value 25% p.a.). Individual tax outcomes depend on your circumstances. Speak to a registered tax agent or accountant before making any decisions.