I thought I gave you a good answer & I told you where to look for your answer & I see you have done some research . Yes you may, if you do what is required of you -- you need to state the price includes the tax . Advise your customers of the fact you are including the sales tax in the price OR pay the FULL sales tax yourself.
You don't have to charge it ; but you do have to pay it.
Read this link - pay attention to question number 2 & 3
http://www.boe.ca.gov/sutax/faqpurch.htm
"Who is responsible for paying sales tax to the Board of Equalization (BOE)?
As a seller, you owe the sales tax and are responsible for paying the correct amount to the BOE. If you do not pay the correct amount, you are subject to additional tax charges plus applicable penalties and interest charges."
"Can I collect sales tax from my customer?
Yes. Although you are required to pay and report sales taxes to the BOE, you may be reimbursed by your customer for the amount of tax you owe on a sale. For example, if you are required to pay $1.75 in sales tax on a sale, you may pass that cost on to your customer, provided it is agreed to as part of the sale. It is presumed that the customer agrees to pay the addition of the tax if:
You list a separate amount of sales tax reimbursement on your receipts or invoices;
You post a sign on your premises stating that sales tax reimbursement will be added to all prices of taxable merchandise, or make a similar statement on price tags, advertising material, and other printed material directed to the purchaser; or
The sales agreement specifically calls for the addition of sales tax reimbursement.
If you include sales tax reimbursement in your prices, rather than itemizing it separately on your invoices or receipts, ***you **must** inform the buyer that tax is included***. You can post this information at your premises in a location that is visible to purchasers; or you can include it on a price tag or in an advertisement (whichever is applicable). Use one of the following statements:"
Otherwise you have to pay the full sales tax on the item - so yes, you can pay it.. The tax is imposed on the seller in CA.
It doesn't matter if its a retail store or you are doing business online.
BTW - to calculate the sales tax when you include it in the price of the item - divide the price by 1 plus sales tax rate. For example - you sell an item for 100 & sales tax is 8%.. 100 divided by 1.08 = 92.59 . If you do it this way - you have to inform your customers - otherwise you can pay the tax on the FULL price yourself or in other words in this example $8 if you don't charge the customer the tax. You can't reduce the price of the item when you report your sales.
When I answered your question the other day - one state specifically mentioned you can NOT absorb the sales tax. You have to charge. ( even though the seller is still responsible for paying it). This is NOT the law in CA.
http://www.accountingcoach.com/blog/calculate-sales-tax
Good Luck