Income tax is a tax imposed by governments on the financial income of entities within their jurisdiction. Individuals and businesses must file annual income tax returns to determine if they owe taxes or are eligible for refunds. Some common income tax scams include generating fake PAN cards and filing fraudulent returns to obtain refunds, as well as misusing sales tax numbers to import goods without paying taxes. It is important for taxpayers to choose reputable tax preparers and to carefully review their returns to avoid being victims of tax fraud.