Excise duty payment deadlines require electronic settlement or authorised exceptions, with interest and penalty for late non-payment. Duty on goods removed is payable by specified monthly or quarterly deadlines, earlier where paid electronically, with an extended date for March/last quarter; assessees eligible under a value based exemption follow quarterly timetables for the financial year. Electronic payment via internet banking is mandatory unless authorised otherwise in writing; duty is deemed paid only when credited to the Central Government account. Late payment attracts interest from the day after the due date until payment and a monthly penalty for declared but unpaid duty beyond one month; recovery follows the statutory recovery mechanism. Cheque payment is effective on presentation and realization; CENVAT liabilities constitute duty for these purposes.