Tax Account Number is commonly referred as Tax Deduction Account Number or Tax Collection Account Number, or TAN. TAN registration generatesa 10 digits alpha-numeric code that is issued by the Income Tax Department of India. As the name suggests, it is obtained by the person responsible for deduction or collection of tax at source (TDS or TCS). Businesses while deducting the salaries of employees must obtain and mention the number. Specified criteria to collect and deduct tax at source as prescribed by the Government. Also, it is compulsory to quote TAN of the assesses in TDS/ TCS statements and challan.