(b)a copy of Challan in Form 26 or [e-Receipt] [Substituted for 'e-Challan' by Notification No. F-A-5-7-2006-1-V (40), dated 14-6-2006.] in Form 26-A in proof of payment of the amount of tax, if any, payable in addition to the tax already paid along with the original return and interest payable on such amount.