PhyntaraTutorial · GST · Look up a word
17 · Glossary — GST words in plain English
AATO, ARN, CDNR, IFF, IRN, LUT, POS, QRMP, RCM, SAC, 2B. Look here when a chapter uses a short form. About 6 min. As of August 2026.
This tutorial explains GST the way a new founder or accounts clerk needs it, and how the same work is done in Phyntara. It is teaching, not a legal opinion. Thresholds, due dates, and late fees change when the GST Council notifies them. Your CA files. Confirm the live rule on gst.gov.in before you act on a rupee.
You do not need to memorise these. When a chapter uses a short form, this is the meaning we intended.
| Word | Plain English |
|---|---|
| AATO | Annual aggregate turnover — the GST portal’s running total of your supplies, used for e-invoice and QRMP tests |
| ARN | Application reference number you get when you apply for a GSTIN |
| B2B / B2C | Business to registered business (buyer GSTIN) vs consumer / unregistered |
| CDNR | Credit/debit notes for registered buyers, in GSTR-1 |
| CGST / SGST / IGST | Centre GST, state GST, integrated GST — see What GST actually is |
| Composition | Small-dealer scheme: bill of supply, no ITC for the customer, turnover cap |
| DPIIT | Department that recognises Startup India companies — not a GST exemption |
| E-invoice / IRN | Invoice Registration Portal number + signed QR required for notified B2B taxpayers |
| E-way | Permit to move goods above the notified value |
| GSTR-1 | Your list of outward supplies (sales) for the period |
| GSTR-3B | Summary return where tax is paid. Phyntara does not file this |
| GSTR-2B | Auto-drafted inward credit statement — not a photo of a vendor PDF |
| GSTIN | 15-character GST registration number. First two digits are the state |
| HSN / SAC | Code for goods / services on the line of a bill |
| IFF | Invoice Furnishing Facility — QRMP filers can push B2B invoices in months 1–2 of the quarter |
| IMS | Invoice Management System — accept/reject/pending supplier invoices. CA desk only |
| ITC | Input tax credit. Owner desk says tax credit |
| LUT | Letter of Undertaking so exports can go out without paying IGST first |
| OIDAR | Online information and database access or retrieval — overseas digital services rules |
| POS | Place of supply — the state that decides CGST+SGST vs IGST |
| PMT-06 | Challan to pay GST on the portal |
| QRMP | Quarterly return monthly payment — small regular taxpayers |
| RCM | Reverse charge — buyer pays GST instead of the seller, on notified supplies |
| Section 16 / 17(5) | Credit allowed / credit blocked |
| Section 22 / 24 | Registration by turnover / compulsory registration |
| Section 47 / 50 | Late fee / interest |
| Section 73 / 74 / 74A | Demand for short tax — no fraud, fraud, and the FY 2024–25+ combined track |
| Section 122 / 129 | Offences and penalties / detention of goods in transit |
| TRN | Temporary reference number at the start of GST registration |
| UTR | Bank unique transaction reference for a NEFT/RTGS/IMPS |
| Zero-rated | Exports / notified SEZ supplies — 0% with refund machinery, not the same as exempt |