A state-sponsored tax that is added to products or services that are seen as vices, such as alcohol, tobacco and gambling. These type of taxes are levied by governments to discourage individuals from partaking in such activities without making the use of the products illegal. These taxes also provide a source of government revenue.

Sin taxes are typically added to liquor, cigarettes and other non-luxury items. State governments favor sin taxes because they generate an enormous amount of revenue and are usually easily accepted by the general public because they are indirect taxes that only affect those who use the products. When individual states run deficits, the sin tax is typically one of the first taxes recommended by lawmakers to help fill the budget gap.