Local district taxes significantly impact the overall sales tax burden in California by adding additional percentages to the base state rate of 7.5%. These local taxes vary by county and city, resulting in total sales tax rates ranging from 7.5% to over 10% in areas like Los Angeles and San Francisco. This variation affects both consumers and businesses by altering the total cost of goods and services, influencing purchasing decisions, and requiring accurate tax collection based on the buyer’s location. Understanding local district taxes is crucial for compliance and financial planning.