California law requires the County Tax Collector to collect taxes on certain business property, such as equipment and fixtures, and certain personal property, such as boats and airplanes. Each year, the County Assessor sets the values for such property on January 1st for the upcoming fiscal year, which runs from July 1st to June 30th.
The County Auditor calculates the taxes due by multiplying the assessed values by the tax rates.
The Tax Collector then issues tax bills in July and collects the taxes.
The obligation to pay unsecured property taxes belongs to the owner of the unsecured property as of January 1st when the values are set. The January 1st owner is responsible even if the property is sold, removed from the County, or destroyed after that date. The only exception comes when a signed agreement by the new owner to pay the taxes has been submitted to the Tax Collector at the close of escrow.