Social Welfare Surcharge must be paid in cash; cannot be debited against duty credit scrips for imports. The Social Welfare Surcharge is leviable on imports as a customs duty calculated on aggregate duties, taxes and cesses, and is not exempt under the Foreign Trade Policy or customs exemption notifications. Duty credit scrips (MEIS/SEIS) are payment instruments for specified customs duties but do not permit debit of SWS; SWS must be paid in cash. System changes enforce this practice, and past debits of SWS to scrips up to the stated cutoff are accepted without recovery.