In most cases, a dealer's value is determined by the dealership itself. Each dealership is required to file an Annual Declaration with the appraisal district, and a copy to the tax office, in the county where the dealer is physically located. The Annual Declaration is a summary of the previous year's sales divided by 12. The end value is applied to the current year multiplied by the current year's tax rate to generate a bill. If an Annual Declaration is not filed, the appraisal district will use best practices to determine the current year's value.