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Loudoun County uses publications from The National Automobile Dealers Association (NADA) as the primary valuation guides for personal property assessment purposes, as do all 134 cities and counties in Virginia. In arriving at the used vehicle values published in its valuation guides, NADA collects and analyzes over half a million auto-related transactions per month, including both wholesale and retail sales. NADA collects its data from a number of sources, including automobile manufacturers, new and used vehicle dealers and over 165 automobile auctions nationwide. Additionally, NADA considers economic trends, geographic location, weather and environmental factors in the analysis of its automobile valuation data.
Due to various market factors, values for some vehicles may be higher as of January 1 of the current year than they were on January 1 of the previous year. This rise in vehicle value may be due to increased demand or diminished supply for a particular vehicle model or vehicle type, gas price fluctuations or other factors affecting vehicle sales, such as government or manufacturer incentives.