Free Western Australia Trailer Bill of Sale
All trailers used on public roads in Western Australia must be registered with DoT WA, and a private sale triggers the same 5-business-day transfer deadlines that apply to cars and boats. Whether it is a box trailer, car trailer, boat trailer, or horse float, the seller must lodge the Duty to Notify and the buyer must complete the vehicle licence transfer within 5 business days of the agreed sale date.
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Western Australia Trailer Bill of Sale — What You Need to Know
Stamp Duty / Tax Details
Stamp duty on trailer transfers is $2.75 per $100 of dutiable value up to $25,000, the same rate as other light vehicles. Duty is assessed on market value if the stated price appears artificially low.
Inspection / Roadworthy Requirements
No pre-sale roadworthy is required for private trailer sales in WA, though trailers operating on public roads must meet ongoing roadworthy standards under WA road traffic regulations.
Western Australia Trailer Sale — Step-by-Step Checklist
- Record the trailer's VIN or chassis number, make, type, year, tare weight, ATM (aggregate trailer mass), and agreed sale price on the bill of sale.
- Both parties complete the Transfer of Vehicle Licence form at a DoT WA centre or via MyLicence.
- Seller lodges the Duty to Notify within 5 business days.
- Buyer pays stamp duty at $2.75 per $100 at the time of transfer.
- Check the trailer's lights, brakes (if required), tyres, and coupling are roadworthy before delivery.
- If the trailer is sold with a boat, complete the boat's vessel licence transfer separately.
- Both parties retain signed copies of the bill of sale.
Common Pitfalls
- Forgetting the DNT for what seems like a low-value item: parking infringements and road safety notices continue to track the registered owner until the DNT clears the record.
- Not recording the ATM on the bill of sale: the aggregate trailer mass determines towing licence requirements and affects stamp duty valuation for heavier plant trailers.
- Selling a trailer with unregistered safety defects: WA road traffic regulations hold the seller liable for any safety defect known at the time of sale that is not disclosed to the buyer.
- Assuming the trailer is included in the towing vehicle's registration: trailers have their own separate licence and must be transferred independently.
Pro Tip
The 5-business-day deadlines for trailers are as strict as for vehicles — lodge the DNT immediately after the sale and remind the buyer to complete the transfer at DoT WA before the deadline.