July 1, 2011 CA sales tax decrease July 2011 Edit Delete Tags Autopost California Statewide Sales and Use Tax Rate to. Decrease by 1% on July 1, 2011.Search for more info in Sales Tax reduction in CA:http://www.google.com/m/search?source=mog&hl=en&gl=us&client=safari&q=ca%20sales%20tax%20decrease%20July%202011&sa=N