GST Manager for WHMCS — Indian GST Invoicing & Compliance

GST Manager is the complete statutory compliance and invoicing solution for WHMCS merchants operating in India or billing Indian clients.

It automates GST calculation, generates statutory tax invoices and credit notes, captures client GSTINs with format validation, and exports ready-to-file GSTR-1 return reports.

Key Features

• Automated GST Tax Rules: Automatically creates and configures WHMCS tax rules for intra-state (CGST 9% + SGST 9%) and inter-state (IGST 18%) transactions based on merchant and client states.
• Statutory GST Invoice PDFs: Generates compliant PDF invoices displaying Seller & Buyer GSTINs, State Codes, SAC/HSN codes, Place of Supply, reverse charge status, and bank payment instructions.
• GSTIN Capture & Real-Time Validation: Captures client GST identification numbers on registration and checkout with real-time 15-character format validation and state code matching.
• Export Invoices & FEMA Compliance: Handles zero-rated export invoices with mandatory LUT/Bond declarations, foreign currency conversions, and dedicated export invoice numbering.
• GSTR-1 Ready Reports: Generates one-click CSV export reports for B2B invoices, B2CS (consumer) sales, and zero-rated exports matching GST portal specifications.
• Financial Year Dashboard: Visual compliance widgets tracking annual turnover, GST collected by component (CGST, SGST, IGST), and quarterly tax liabilities.
• Self-Healing & Integrity Checks: Automatic database schema migrations, file checksum audits, and one-click updates directly from the admin dashboard.

Requirements

• WHMCS 8.13+ or WHMCS 9.x
• PHP 8.2, 8.3, 8.4, or 8.5
• ionCube Loader 13.0.2 or higher
• PHP curl, openssl, json, zip, and mbstring extensions
• Active Indian GSTIN