Permanent Account Number (PAN) is a unique identification 10 digit number allotted to each tax payer ie Company, LLP, Firm, Individual, HUF, society, trust etc.
Tax deduction and collection account Number (TAN) is a ten-digit alphanumeric number allotted to those who are supposed to deduct (TDS) or collect tax at source (TCS). Getting TAN number is very important for business entity deduction or collecting tax as it is required to make payment of TDS and TCS.