First, know that every state and country has a set of different expectations and standards when it comes to taxes. This means you have to conduct some research and understand your target market.
For instance, if your store’s demographic is located in the U.S., you’ll likely want to display your prices exclusive of tax. However, if your target demographic is Australian, for example, where shoppers are accustomed to seeing all-inclusive prices, you’ll want to display your prices with tax.
Some other issues to consider is what you are selling and where you are selling it from. For instance, if you are located in New York and want to sell clothing, know that clothing is taxed in New York state. In Britain, VAT tax applies to all non-essential goods.