WHMCS Addon Module · v4.3.0
GST compliance for WHMCS, solved.
GST Manager automates GST invoicing, GSTR-1 reports, and export invoice compliance for your Indian WHMCS hosting business — with one-click setup, HMAC-secured integrity, and auto-updates.
GSTR-1 · Export · Legacy
Invoicing, tax, GSTIN
Tamper detection
All WHMCS themes
ionCube ready
Simple, transparent licensing
One license per WHMCS installation. Includes updates, support, and unlimited invoices.
Leased License
Yearly plan with continuous updates
- 1 WHMCS installation
- All features & reports
- One-click auto-updates
- Email & ticket support
Lifetime License
Pay once, own it forever
- One WHMCS installation
- All features & reports
- 1 year free support & updates
- Email & ticket support
Everything you need for GST compliance
From the first invoice to the GSTR-1 export — automated, audited, and audit-trail-ready.
One-click system setup
Configure invoicing, tax rules, GSTIN, bank details, and export settings through a single guided wizard.
GSTR-1, export & legacy reports
Generate B2B & B2C GSTR-1 reports, export invoice schedules, and legacy CSV exports — ready for your CA.
Custom SAC & purpose codes
Map invoice items to specific SAC codes and FEMA purpose codes — per product, per service type, automatically.
HMAC-SHA256 integrity
Tamper-detection across module files and database. If anything's modified without your permission, you'll know.
Export invoice compliance
Sequential export numbering, FEMA declarations, currency-specific bank details, and remittance instructions — built in.
Auto-sync & auto-update
Invoice templates auto-deploy to every WHMCS theme. The plugin updates itself in one click — with auto-restore on failure.
Filing returns shouldn't take a weekend.
Generate GSTR-1 reports (B2B and B2C), export invoice schedules, and legacy GST CSVs in a few clicks. Hand them to your CA — or upload to the GST portal directly.
- GSTR-1 B2B with auto-generated GSTIN classification
- B2C summary with state-wise tax breakdown
- Export invoice reports with FEMA declarations
- Date-range filters, CSV exports, audit trails
See the whole picture — at a glance.
The built-in tax dashboard visualises your monthly invoice counts, tax collected, and B2B vs B2C vs export breakdowns. Charts powered by real WHMCS data — no spreadsheets, no exports.
- B2B / B2C / Export invoice classification
- Tax trend charts (CGST · SGST · IGST)
- Quick CSV export of paid invoices
- Date-range scoped, filterable by sub-category
HMAC-signed. Tamper-evident.
Every plugin file is checksummed with HMAC-SHA256. The plugin watches for unauthorised modifications to module files and database tampering — and tells you about it before your accountant does.
- HMAC-SHA256 file checksums with secret key
- Continuous integrity verification on admin load
- Auto-backup before every update, auto-restore on failure
- Complete audit log of syncs, updates, and changes
Designed around how Indian GST actually works
Not a generic tax plugin retrofitted for India — built from the ground up for GST and FEMA compliance.
CGST · SGST · IGST
Automatic state-based tax determination. Intra-state customers get CGST+SGST; inter-state get IGST. No manual rules to maintain.
B2B vs B2C routing
Invoices auto-classify based on whether the customer has a GSTIN. B2B and B2C streams stay separate for GSTR-1 filing.
SAC & Purpose codes
Map products to specific SAC codes and FEMA purpose codes. Per-product rules, per-currency overrides — all configurable.
FEMA-compliant exports
Sequential export invoice numbering, FEMA declarations, currency-specific bank/remittance details for foreign customers.
Requirements & compatibility
GST Manager runs on standard WHMCS environments. No exotic dependencies, no server-level changes required.
System Requirements
WHMCS Version8.xPHP Extensions
What does GST Manager actually do?
GST Manager is a WHMCS addon that automates everything required for GST-compliant invoicing in India: tax calculation (CGST/SGST/IGST based on customer state), GST-compliant invoice PDFs with GSTIN, SAC codes and HSN details, export invoice handling with FEMA declarations, and report generation for GSTR-1 filing.
It deploys GST-ready invoice templates to all your WHMCS themes automatically, and keeps everything in sync as you upgrade WHMCS.
How does the one-click setup work?
After activating the module, the setup wizard walks you through six sections: invoicing configuration, tax rules, GSTIN/SAC codes, footer & identity, bank details, and export settings. It also enables WHMCS proforma invoicing and sequential numbering if those aren't already configured.
For most installations, the entire setup takes under 10 minutes.
What WHMCS versions are supported?
GST Manager v4.1.x is built and tested for WHMCS 8.x with PHP 7.4 or higher. ionCube Loader is required (it's pre-installed on virtually all WHMCS-ready hosting environments, including all Relyweb hosting plans).
Will it conflict with my existing invoice template?
No. GST Manager creates a backup of your existing invoicepdf.tpl and invoicepdffooter.tpl in every theme before replacing them. You can always restore the original from the sync log. The plugin's sync status page shows you exactly which themes have the new templates deployed and which don't.
What reports can I generate?
Three primary reports: GSTR-1 (B2B with GSTIN-bearing customers, B2C with state-wise summary), Export Invoices (with FEMA declarations and currency totals), and a Legacy GST CSV export for historical reconciliation. All reports support date-range filtering and CSV download.
How does the licensing & update system work?
Each license is tied to one WHMCS installation (matched by domain and directory). The plugin checks your license periodically and caches the result locally for 15 days. Updates are checked once daily — when an update is available, you can apply it with a single click from the admin panel. The plugin backs up the current installation before every update and auto-restores if anything fails.
What if I cancel? Do I lose access?
If you cancel an annual license, the plugin continues to work, but you won't receive further updates or support. The Lifetime license never expires — you keep updates and support forever for the WHMCS installation it's tied to.
Do you offer support if I get stuck?
Yes. All licenses include email and ticket support. Lifetime licenses get priority response. Most setup questions are answered within one business day; technical issues typically faster. We're based in Ahmedabad and support is provided in English and Hindi.
Can I get a refund if it doesn't work for me?
Yes — we offer a 14-day money-back guarantee. If GST Manager doesn't work for your setup or doesn't meet your needs, just contact support within 14 days of purchase for a full refund.
Release history
What’s new in GST Manager — newest first.
v4.3.0 08 Sep 2026 Latest
Fixed
- The license manager now handles unexpected or missing responses more reliably.
- The module now includes a link to the changelog during installation.
Related apps
Other Relyweb apps that fit alongside GST Manager.
GST Manager for Shopify
GSTIN capture, CGST/SGST/IGST split, Tax Invoice & Credit Note PDFs, GSTR-1 + GSTR-3B exports.
GST Manager
CGST/SGST/IGST split, GSTIN validation, SAC codes, GSTR-1 reports.
RelyPay
One payment layer for every gateway — Razorpay, Cashfree, PhonePe, more.
Stop hand-managing GST. Start invoicing.
Set up GST Manager in under 10 minutes. 14-day money-back guarantee, no risk.