Loudoun County levies a tax each calendar year on all motor vehicles, trailers, campers, mobile homes, boats, and airplanes with "situs" in the county. A vehicle has situs for taxation in Loudoun County if it is garaged, parked, or stored in the county, or if it is registered to a county address with the Virginia Department of Motor Vehicles.
You are required to file a personal property return
with the Commissioner of the Revenue within 60 days
of acquiring or bringing such property into Loudoun County or one of Loudoun's seven incorporated towns. This applies to all vehicles owned by individuals or businesses, whether titled in Virginia or out of state.
Personal property taxes are billed semiannually and are due to be paid to the Loudoun County Treasurer
by May 5 and October 5 of each year, or December 5 if the vehicle becomes taxable in Loudoun County in the latter part of the year.