It's common knowledge that sales tax is not included that price, you have to know that. Do they include tax in the price of stuff at Best Buy, or any other store? In addition, doc fees, and, if applicable, acquisition fees, title/license, are usually not either. Also, if applicable, MACO fees being included in invoice price vary from dealer to dealer...just have to ask them about it.
Invoice price is one thing, OTD (out the door) price is another, and you don't know the difference.