Health security cess monthly return requires machine and manual cess calculation, abatement adjustment, timely payment, and verification. Form HSNS RET-01 requires monthly self-assessment and payment of Health Security se National Security Cess, with separate computation for machine-based operations under section 5(2)/Table I and for manual processes under section 5(4)/Table 2. The form captures machine registration, applicable cess rates, working status, and sealing/desealing dates; requires reporting and adjustment of abatements under rule 15(3); summarises net cess payable including interest under section 17 and penalties; records challan payment details; and mandates authorised signatory verification and filing by the twentieth day of the following month.