Prices in New York City stores and restaurants are exclusive of taxes. The restaurants in New York City will add a tax of 8.875% to your bill.
As for shopping, as of April 2012, apparel that is less than $110 is not taxed. There is a sales tax of 4.5% on more expensive clothing items. The tax of 8.875% may be added to other purchases such as electronics or jewelry. You can always check the exact sales tax with a shopping assistant.
Despite the fact that taxes don’t change often, just in case you can always review the current sales tax rates online.
Tipping in restaurants and taxi is usually at 15-20%. Waiters usually don’t get a salary; their main income comes from tips. It is also recommended to give a few dollars to the porter at the hotel if he is helping with your bags.