<s>[INST] Do I need to insist on some proof of payment from the Banker to whom I have submitted the challan? [/INST] The counter-foil of the Income-tax Challan filled by taxpayers, should be stamped and returned by the bank. Please ensure that the bank stamp contains BSR (Bankers Serial number code), Challan Identification Number (CIN) and the date of payment. </s>