Are Truck Finance Repayments Tax Deductible?

Key highlights

• The repayment itself is not usually deductible in full, but its components may be
• Under a chattel mortgage, interest and depreciation are typically the deductible parts
• Under a lease, the rental payments are often deductible instead
• Business-use percentage matters if the truck is used privately at all
• Your accountant should confirm what applies to your structure and circumstances

Why the repayment itself is not the deduction

A truck repayment is really two things bundled together: a portion that pays down the amount you borrowed, and a portion that is interest or finance cost. Repaying the principal is simply returning borrowed money, so that part is generally not a deduction in itself. What may be deductible are the finance cost and, depending on structure, the depreciation of the truck. This is why you cannot just tally your annual repayments and claim the lot. The deductible elements are pulled out separately. Once you understand that a repayment has parts, the question shifts from is the repayment deductible to which parts of my arrangement are deductible, which is a far more useful way to think about it.

Chattel mortgage: interest and depreciation

Under a chattel mortgage, the most common structure for truck buyers, your business owns the truck and borrows against it. In that setup, the interest component of your repayments is generally deductible, and you can typically also claim depreciation on the truck itself, subject to the current rules and any write-off concessions. So while the principal portion is not a deduction, the interest and depreciation together often add up to a meaningful annual claim. Because you claim depreciation, the up-front cost of the truck flows into your deductions over time or immediately if a write-off applies. This combination is a big reason chattel mortgages are popular with operators focused on the tax side, but the exact figures are for your accountant.

Lease and rental: the payments themselves

Lease and rental style products work differently. Here the financier generally owns the truck, and you are effectively paying to use it. In that case the lease or rental payments are often deductible as a business expense, rather than you claiming interest and depreciation separately. For some operators that makes the tax side simpler, since the payment is treated more like a straightforward running cost. The trade-off is that you typically do not own the asset during the term and do not claim depreciation. Whether a lease produces a better overall outcome than a chattel mortgage depends on your profit, cash flow, and how long you want the truck, so it is a genuine comparison to work through with your accountant.

Business use versus private use

Deductibility also hinges on how the truck is used. If a vehicle is used wholly for your business, the deductible components generally relate to that full business use. Where there is any private use, deductions are typically apportioned to the business-use percentage. For a dedicated heavy truck, private use is often negligible, but for lighter commercial vehicles that double as personal transport it can matter more. Keeping sensible records of business use protects your position if questions ever arise. This is another area where the general principle is simple but the application depends on your circumstances, so it is worth a quick conversation with your accountant to make sure your claim reflects how the truck is actually used.

Other running costs that may be deductible

Beyond finance, the day-to-day costs of running a truck are generally deductible business expenses too. Fuel, tyres, servicing, repairs, registration, insurance, permits, and tolls all typically count when the truck is used for your business. These are often larger than the finance cost over a year, so they matter to your overall position. Good record keeping across all of them, ideally through clean bookkeeping rather than a shoebox of receipts, makes tax time smoother and ensures you do not miss legitimate claims. When you combine deductible finance costs, depreciation or lease payments, and running costs, the true after-tax cost of operating a truck is usually lower than the raw repayment suggests, though your accountant should confirm the totals.

Match your finance to your tax plan

The recurring theme is that structure drives deductibility, so decide your tax approach before you lock in finance. If claiming depreciation and interest suits you, an ownership-based chattel mortgage is usually the fit. If deducting a simple payment appeals and you are comfortable not owning the asset during the term, a lease may work. Bring your accountant's preference to the finance conversation, and a broker can find lenders comfortable with that structure, your industry, and your truck's age. Doing it in that order avoids the frustration of signing a loan that does not support the deductions you were expecting, and it keeps your after-tax numbers working the way you intended.

If you want your next truck loan structured to line up with how you plan to claim, it helps to have the finance and tax sides talking early. Simon Kendrick can compare indicative options across 80+ lenders and set the structure up around your accountant's advice. A quote uses a soft credit check only, so there is no impact on your file, and eligible applicants can often get a decision within 24 to 48 hours. Rates are indicative from around 6.55% p.a. and subject to assessment. Reach out to Overdrive Truck Finance for an obligation-free quote.