For orders in California, sales tax is calculated at state level. For orders in Sacramento County, local and state tax apply. For orders outside California, there is no sales tax.
The Internet Tax Freedom Act, signed into law on Oct. 21, 1998, does not, as some have asserted, preclude sales and use taxes on any and all commerce conducted over the Internet. State and local governments are allowed to impose sales and use taxes on all such electronic sales, provided that the tax (and its rate) are the same as that which would be imposed on the transactions if they were conducted in a more traditional manner, such as over the phone or through mail order.