GST Billing Software: The Complete 2026 Guide for Indian Businesses
What GST billing software should do — CGST/SGST/IGST, HSN codes, e-invoice readiness, and the honest test to run before you buy.
GST billing is one of those problems that looks simple until you have five invoices with wrong tax splits in a single quarter — and your CA has to spend a Saturday fixing it. Good GST billing software removes that failure mode entirely.
The 8-point test to run before buying
- Can it derive CGST+SGST vs IGST automatically from buyer state?
- Does it enforce HSN/SAC codes per line?
- Are invoice numbers strictly sequential per FY?
- Does the PDF meet the mandatory field list?
- Can it export CA-friendly monthly summaries (CSV/Excel)?
- Does it integrate with a payment gateway (Razorpay)?
- Can I share via WhatsApp in one tap?
- Is my data scoped per user with RLS?
The mistakes that fail GST audits
- Reused invoice numbers across years.
- Wrong tax split on inter-state invoices.
- Missing HSN codes on line items above ₹5 lakh threshold.
- No place-of-supply on service invoices.
How AIFlowBiz handles it
Pro and Business plans include full GST invoicing with the checks above. Business adds Autopilot for marketplace order → GST invoice loops.
Frequently asked
Is e-invoicing supported?
The invoice format is e-invoice-ready. IRP integration is API-ready and activates when you paste your GSP credentials.
What about composition dealers?
Composition dealers issue bills of supply. The same PDF template supports both modes.
Run this in AIFlowBiz
Connect your store, generate GST-ready invoices, automate inventory and ecommerce orders, and compare plans.