When you upgrade a work vehicle, most of the attention goes to the new one: the price, the finance and the deduction. The vehicle you sell or trade in has tax consequences too, and they can arrive as a bill at the end of the year, after the trade-in money has already gone to pay out the old loan.
This guide is for established business owners who are planning to sell or trade in a vehicle that has been used in the business, and want to know what the ATO's rules mean for cash flow before they sign. It explains GST on the sale, the balancing adjustment, how assets that were written off or pooled are treated, and works through three examples. The ATO pages were checked on 10 November 2026.
Selling a business vehicle is a balancing adjustment event
The ATO says that when you stop holding or using a depreciating asset, you must calculate a balancing adjustment. You compare the asset's termination value with its adjustable value:
- The termination value is generally what you receive for it, including the market value of anything non-cash you receive. That includes a trade-in allowance.
- The adjustable value is generally its cost less its decline in value up to that time.
If the termination value is more than the adjustable value, the difference is included in your assessable income. If it is less, the difference is a deduction. Either way it applies in the income year of the sale.
GST on the sale or trade-in
The ATO says the termination value is reduced to exclude GST payable if the disposal is a taxable supply. In its own example, a business sells an old photocopier for $2,750, the $250 GST payable comes off, and the termination value is $2,500. For a GST-registered business selling a vehicle it has used in the business, that means the GST on the sale price goes to the ATO in your activity statement, and only the GST-exclusive amount counts for the balancing adjustment. If the vehicle was also used privately, ask your tax agent how GST applies to the sale.
If the vehicle was used partly for private purposes
The ATO says that if an asset was used only partly for a taxable purpose, the balancing adjustment is reduced to the taxable purpose proportion, and the private proportion of the difference between termination value and cost can be a capital gain or capital loss. Your logbook percentage is the starting point for that proportion.
If the vehicle was written off or is in a small business pool
Many small businesses claimed their vehicle through the instant asset write-off or the simplified depreciation pool. The ATO's small business pool calculations cover what happens when you sell:
- Pooled vehicle: reduce the pool balance by the termination value multiplied by the taxable use proportion. The ATO says the termination value can be money received from selling the asset, including by way of trade-in. If the pool balance goes below zero, the amount below zero is included in assessable income.
- Vehicle fully written off: include its termination value multiplied by its taxable purpose proportion in your assessable income.
The ATO's own example is a station wagon used 70% for business and traded in for $10,000 on a new delivery van, giving a taxable purpose proportion of $10,000 × 70% = $7,000.
Special balancing adjustment rules also apply to cars that cost more than the car limit, and to cars where different methods were used to claim car expenses. If either applies to you, get your tax agent to run the numbers. Our guide to the instant asset write-off for vehicles explains the car limit.
Worked examples: the same trade-in, three ways
These are our calculations, using the ATO rules above. They assume a GST-registered business, a ute traded in for $33,000 including GST, 100% business use unless stated, and an existing chattel mortgage with a $25,000 payout figure. They do not work out the tax payable, which depends on your structure and income.
The trade-in itself
- GST payable on the trade-in: $33,000 ÷ 11 = $3,000.
- Termination value: $33,000 less $3,000 = $30,000.
- Cash equity after the loan is paid out: $33,000 less $25,000 = $8,000, before the $3,000 GST is remitted. After it, $5,000.
Example 1: depreciated under the general rules, adjustable value $28,000
- Balancing adjustment: $30,000 less $28,000 = $2,000 included in assessable income.
Example 2: fully written off under the instant asset write-off
- The whole termination value is included: $30,000 × 100% = $30,000 of assessable income.
- That is six times the $5,000 of cash equity left after the payout and GST.
Example 3: written off, used 70% for business
- Assessable income: $30,000 × 70% = $21,000.
Example 2 is the one to plan for. An earlier write-off brought the deduction forward, and the sale brings it back as income. The tax on it falls due with your return, but the trade-in allowance has already gone to the old lender.
Planning the upgrade around the tax
- Ask your tax agent for the vehicle's adjustable value, or whether it was written off or pooled, before you negotiate. It tells you which example you are in.
- Get a written payout figure for the existing loan, and reconcile it with the trade-in allowance and the GST. Our guide to upgrading a financed work vehicle with positive equity shows how to set the four amounts out.
- Set aside the GST and the tax from the sale before using the equity as a deposit on the new vehicle. If the new vehicle is also written off in the same year, ask your agent how the two offset for your business.
- Check your PAYG instalments. A large balancing adjustment can change your income for the year. Our guide to PAYG instalments and car loans explains how instalments are worked out.
- Compare the finance for the new vehicle on complete figures, including any balloon. Our guide to a chattel mortgage explains GST credits and ownership on the purchase side.
When you are ready to compare, you can explore business vehicle finance or read about finance for a work ute or van.
The bottom line
Selling or trading in a business vehicle triggers a balancing adjustment, and GST on the sale if you are registered. If the vehicle was written off, the whole GST-exclusive sale amount, adjusted for private use, can become assessable income, even though most of the money may have gone to pay out the old loan. Know which case you are in before you sign, and keep the tax and GST aside.
The rules and examples quoted are the ATO's, checked on 10 November 2026. Our worked examples are labelled calculations using stated assumptions. This article is general information only and is not tax or financial advice. Speak to a registered tax agent about your business before you sell or trade in a vehicle.
