18% GST Invoicing & Tax Math Engine

The Cora GST Math Engine handles all tax calculations required for Indian service businesses and commercial studios:

• Intra-State (Same State): Splits 18% GST into 9% CGST + 9% SGST.
• Inter-State (Different State): Applies unified 18% IGST.
• SAC & HSN Codes: Pre-seeded with SAC 998381 (Commercial Photography & Film Production Services) and manufacturing HSN codes.
• Pro-Forma & Tax Invoices: Generate 50% advance pro-formas and final tax invoices with instant payment links.

4. Automated Document Vault & SHA-256 Linkage (v4.9.303–v4.9.304)

• Multi-Step Creator Validation: Strict validation across client GSTIN, line item rates, and tax calculations.
• Instant Vault Registration: Publishing an invoice automatically creates an immutable record in the Document Vault with a cryptographic SHA-256 hash.
• End-to-End Audit Trail: Ties invoices directly to signed contracts and accountant tax packs.