GST in QuantX Ops: Place of Supply, E-Invoicing and What the Law Expects

Getting GST wrong is not a cosmetic problem. Output tax is a statutory liability, and an invoice that goes out without it is an unfiled liability sitting quietly in your books.

QuantX Ops asks whether you charge tax — it does not assume

Not every business charges GST. Below the registration threshold there is nothing to register; some supplies are exempt; and plenty of companies operate outside India altogether. Both possible assumptions are harmful:

• Assume you are registered, and invoices carry tax you are not entitled to charge. Customers refuse them.
• Assume you are not, and invoices go out with no tax on them. You have an unfiled liability.

So the setup checklist asks, once, with two buttons: We are GST-registered or We do not charge tax. Answer the second and your invoices correctly carry none. Answer the first and QuantX Ops then wants the registration on each site — because the invoice carries the registration of the site that raised it.

Place of supply, derived from the customer

The first two digits of a GSTIN are the state code. QuantX Ops reads the customer's own registration, compares it with the state of the site raising the invoice, and splits the tax accordingly. The output is CGST and SGST within the state, IGST across it.

Where e-invoicing thresholds sit

India's e-invoicing mandate has tightened steadily. It began in 2020 applying only to businesses above ₹500 crore. The threshold has been ₹5 crore since 1 August 2023, covering B2B, export, SEZ and deemed-export supplies.

Two details catch people out:

• It is based on your highest past turnover, not your current one. Cross ₹5 crore in any financial year since 2017-18 and the obligation stays, even if turnover later falls.
• Businesses at ₹10 crore and above must report invoices within 30 days of the invoice date, effective 1 April 2025.

QuantX Ops produces a proper GST tax invoice — both GSTINs with state codes, place of supply, HSN/SAC, tax under each head, and the amount in words — which is the document those rules are written about.

Next: Credit and debit notes.