You can set up different sales tax rates for each of the service areas.

Tax Rates must be set it up in your Yardbook Settings, which can be accessed using the My Company area of the Sitemap.   Go to Sitemap -> Company Profile -> Settings -> Set Up Sales Tax Rate.  Click on the green ‘+Add’ button and fill out the two required fields, ‘Tax Rate Name’  (ie: SM County) and ‘Tax %’ (ie: 9%). You may add more than one tax rate so that you can appropriately assign to different Customers as needed. 

Once this is done, you can click into each tax rate and assign to customers  by clicking on the green ‘Add Customers To This Tax Rate’ button.

Note: These tax rates will only be applied to product/services if the ‘Charge Sales Tax?’ field in the product catalog item is set to ‘Yes’.