How the Chattel Mortgage GST Credit Works
Under Australia's GST system, when a GST-registered business purchases a business asset, it can claim back the GST it paid on that purchase. This is called an input tax credit.
With a chattel mortgage, the borrower acquires the asset and the lender funds the purchase. A creditable acquisition may support a purchase-related input tax credit, attributed under the entity's GST accounting basis and the normal invoice and consideration rules.
The Simplified Maximum Illustration
Potential credit = GST included in price × creditable business-use proportion
For a fully taxable, GST-inclusive acquisition, dividing the price by 11 identifies the GST component. That is not automatically the claim: apply business use, tax-invoice requirements, the car limit and other restrictions.
Step-by-Step: How It Flows Through
GST Credit Examples
| Purchase Price (incl. GST) | Maximum simple GST illustration* | Price less illustrated GST* |
|---|---|---|
| $22,000 | $2,000 | $20,000 |
| $55,000 | $5,000 | $50,000 |
| $77,000 | $7,000 | $70,000 |
| $110,000 | $10,000 | $100,000 |
| $165,000 | $15,000 | $150,000 |
| $275,000 | $25,000 | $250,000 |
| $550,000 | $50,000 | $500,000 |
*Assumes a fully taxable acquisition, valid tax invoice, 100% creditable business use and no car limit or other restriction. “Price less GST” is not a total after-tax cost and excludes finance charges, fees and income-tax effects.
Who Can Claim the GST Credit?
You Must Be GST-Registered
Only businesses registered for GST can claim input tax credits. If your annual turnover is:
- $75,000 or more — you are required to register for GST
- Under $75,000 — voluntary registration may be available, but it creates ongoing reporting obligations; obtain tax advice before registering for one purchase
The Asset Must Be Used for Business
You can only claim the credit to the extent the asset is used for your business (GST-taxable activities). If the asset has mixed personal/business use:
- 100% business use = may be able to claim an upfront GST credit to the extent allowed
- 70% business use = claim 70% of the GST credit
- 0% business use = no GST credit claimable
A logbook is the recommended way to document business use for vehicles.
You Need a Valid Tax Invoice
The vendor must provide a valid tax invoice showing the GST amount. For vehicles and equipment purchases, the dealer invoice is usually sufficient. For private sales where the seller is not GST-registered, there is no GST component to claim.
Private Sales — No GST if Seller Is Not Registered
If a used asset is bought from a private individual who is not making a taxable supply, the price generally contains no GST and there is no purchase credit to claim. Any interest or depreciation outcome is a separate income-tax question and remains subject to business use and current law.
Estimate Your GST Credit
Use the calculator to model a simplified GST scenario alongside repayments. It does not determine credit eligibility or the BAS period.
Model GST & Repayments →Chattel Mortgage vs Finance Lease: GST Timing
This is one of the most practically significant differences between the two structures:
An eligible acquisition may create a purchase-related credit under the normal attribution rules. The amount can be reduced by business use, vehicle limits and other restrictions.
Eligible credits generally follow GST included in taxable lease charges under the normal attribution rules. A residual purchase is a separate transaction.
Do not compare the structures by dividing purchase GST across the lease term. Compare the actual purchase tax invoice or lease tax invoices, creditable business-use percentage, car limit, residual transaction and BAS attribution basis.
Luxury Car Tax (LCT) — What to Know
Luxury Car Tax can apply to cars whose LCT value exceeds the threshold for the relevant financial year. The threshold is indexed and the vehicle definition matters, so use the current ATO figure rather than a prior-year amount.
The LCT treatment under a chattel mortgage:
- LCT is built into the vehicle's purchase price by the dealer
- A GST credit is generally capped for cars above the car limit, subject to exceptions
- However, there are depreciation limits (car cost limit) that cap the depreciable value of passenger vehicles — even if you paid more
- Confirm the car limit published for the income year and whether an exception applies
LCT and car cost limits primarily affect passenger vehicles (cars). Commercial vehicles (trucks, utes classified as goods vehicles, forklifts, excavators, etc.) are generally exempt from LCT and the car cost limit.
Always confirm the LCT and depreciation limit treatment with your accountant for your specific vehicle.
Chattel Mortgage GST FAQs
No. Only GST-registered businesses can claim input tax credits. If your turnover is over $75,000 you are required to register; under that threshold it's optional. If you're buying a significant asset, it's worth considering voluntary GST registration as the upfront credit alone can be substantial.
On the purchase price. The GST is payable when ownership of the asset changes hands (at settlement). Your loan repayments are principal and interest — neither component has GST. The one-off GST credit is for the original purchase.
You can claim 60% of the available GST credit. So on a $110,000 vehicle, you could claim 60% × $10,000 = $6,000. Your depreciation claims and interest deductions are also limited to 60% of their full amounts. A vehicle logbook is the ATO's recommended method to document business use.
Only if the private seller is GST-registered and the sale includes a tax invoice with GST. Many private individual sellers are not GST-registered, in which case there is no GST on the purchase and nothing to claim. Equipment purchased through a dealer is almost always subject to GST.
The ATO's guidance on claiming GST credits on asset purchases is available at ato.gov.au — Claiming GST Credits. The specific treatment of chattel mortgages as instalment finance is covered in ATO's guidance on financial supplies and input tax credits.
No. A GST input tax credit is a reduction of your GST liability — it's not income and doesn't increase your taxable income. It also reduces the cost base of the asset for depreciation purposes (you depreciate the ex-GST cost, not the GST-inclusive cost).