What GST-ready billing actually needs in 2026
By AhilTech Team · · 1 min read
The checklist
- HSN/SAC on every line item, not just the invoice.
- Place of supply derived correctly so CGST/SGST vs IGST is right.
- Rounding applied per invoice, with the rounding difference shown.
- Sequential, gap-free invoice numbers per financial year.
- Credit and debit notes linked to the original invoice.
- Immutable stored invoices — once issued, the PDF never changes.
- Exportable registers for your accountant.
Why immutability matters
If an invoice can be edited after it is issued, your books and your customer's books can silently diverge. AhilTech freezes the invoice document at the moment of issue; corrections happen through notes, not edits.
How AhilTech maps to this
Every point above is built into the billing in AhilTech Medical and Hospital, and the same invoice engine powers School fees and Gym payments.