Challan Identification Number (CIN) is the number generated for identification of payment made by the taxable person. It will be generated upon successful credit of the amount to the concerned government account maintained in the authorized bank. CIN shall be generated by the collecting bank and the same shall be indicated in the challan.
ICAI FAQ PUBLICATIONS 06-09-2017 TAX PAYMENT, INTEREST, PENALTY AND OTHER AMOUNTS: FAQ NO. 13)