The tax in Marin County is going up .25 percent to 8.5 percent. In San Mateo County tax will now be 9 percent. That's up .5 percent. And in Santa Clara County, tax will now be 8.75 percent. That's up .125 percent.
Taxes are also going up in several Bay Area cities.
Albany, Half Moon Bay, and Moraga now have the highest tax rate in the Bay Area. Their rate goes up to 9.5 percent on Monday.
Other cities that will also see a tax increase include Fairfield, Healdsburg, Orinda, Rio Vista, Sebastopol, and Vacaville.
For a complete list of the sales tax changes, click here.