What is PAN and why is it important for an income tax returns filler?

What is PAN? Permanent Account Number (PAN) is a 10-digit alphanumeric number, issued by the Income Tax Department. PAN enables the Income-Tax Department to link all transactions of a person with the department. These transactions include tax payments, TDS/TCS credits, returns of income, wealth, gift, FBT, specified transactions, correspondence, and so on. PAN, thus, acts as an identifier for a person with the tax department.