How do I find out what sales tax rate to charge my customers?

You charge the amount they pay in their state, provided you run an ecommerce. If you own a store in La and he buys the items directly out of the store you have to charge him the state tax where your business is located.

I am just an Internet buyer, in NJ. But I 've been charged NY sales tax on online purchases made from NYC companies. Sellers in some other states don't charge me sales tax. To start with, learn the sales tax laws of the state that is the 'tax home' of your business. No small business I know of is set up to collect and transmit sales tax to all 50 states. Generally they charge sales tax only to residents of the state where the business is located. BUT you need to find out what YOUR state's law requires.

It is always the sales tax of the destination. Remember that CA also taxes shipping. You can get the sales tax rates at the Board of Equalization website.

You usually have to charge and pay sales tax based on where someone takes delivery within your state (shipping address). Outside of your state, it depends whether you have a business presence in that state (in which case you would collect/pay that state's sales tax), or if not, if your state requires you do collect/pay tax for out of state sales.

Start with http://www.taxes.ca.gov/Sales_and_Use_Tax/

Since when is there more than one sales tax rate in one state? It should be the same for both of you.

http://www.streamlinedsalestax.org/

I think.... that if you collect the sales tax at the time of sale then you use your sales tax bracket because you are paying to your jurisdiction.

The above link is pretty interesting and should help you a lot.

your city cause he bought it while it was in your city