In Ontario, the standard sales tax on new and used vehicle purchases from a registered dealer is 13% Harmonized Sales Tax (HST). This single tax rate incorporates both the 5% federal Goods and Services Tax (GST) and the 8% provincial sales tax component. However, the tax treatment differs significantly for private sales of used vehicles. When purchasing a used vehicle privately, no HST is collected at the point of sale. Instead, the 13% provincial Retail Sales Tax (RST) is applied when you register the vehicle at ServiceOntario. This tax is calculated on the greater of the declared purchase price or the vehicle's wholesale value, often referred to as the Red Book value, as per provincial regulations. This distinction is crucial for consumers, as it means private sales are not entirely tax-free, and the tax amount can be higher than expected if the declared purchase price is below the assessed wholesale value. Furthermore, any applicable rebates, such as those for electric vehicles, are typically applied before the HST is calculated, reducing the taxable amount. Understanding these nuances is essential for accurate budgeting and avoiding unexpected costs during the vehicle acquisition process in Ontario.