In NSW, a dealer trade-in offer is typically 10–20% lower than a realistic private-sale price, sometimes more if your car needs reconditioning.
Start by checking recent local sale prices for the same year, trim, engine and kilometres on Tradingpost, then discount for dealer margin, GST, warranty risk and tidy-up costs.
Clean history, full logbooks, two keys and fresh tyres can add a few hundred; high kms, accident repairs, hail, or overdue servicing will subtract more than you’d like.
As a rule of thumb, take your private-sale estimate and knock off $1,500–$4,000 on mainstream cars; performance or niche models can vary wildly.
NSW stamp duty is calculated on the purchase price of the replacement car, not your changeover figure, so the trade-in usually doesn’t reduce duty.
Get written bids from at least two dealers (and an online instant-offer mob) on the same day, and play them off politely—works a treat.

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