Budgetary support under GST: manual registration and quarterly refund mechanism for eligible units in specified regions. Manual registration and quarterly claim procedures enable disbursal of budgetary support under GST to eligible units formerly covered by area-based excise exemptions. Budgetary support is computed as specified shares of central and integrated tax debited from the unit's cash ledger, reduced for inputs procured from composition-scheme suppliers. Units must obtain GST registration, one-time scheme registration with unique ID, file quarterly returns and prescribed applications, and submit supporting documentation; jurisdictional Deputy/Assistant Commissioners verify GST return data and CA-certified details where required before sanction and PFMS credit.