GST Return Terms and Meanings: Complete GSTR Glossary

Who should read this: New GST registrants, small business owners, accountants, and anyone decoding the GST portal.

Reading time: ~14 minutes · Last updated: 30 June 2026 · Applicable period: FY 2025-26 onwards

Written by Reddy Sri Harsha (Kondapur, Hyderabad). Reviewed by a Chartered Accountant on our practice team. References are to the CGST Act, 2017 and the GST portal. See Sources.

GST is full of form numbers and abbreviations. This glossary defines each term used in GST returns, grouped the way you meet them: registration and identifiers, the return forms, input and output tax terms, supply types, documents, and the compliance mechanisms like e-way bills and e-invoicing.

Registration and Identifiers

GST Return Forms

Input, Output, and Tax Terms

Supply Types

Documents

Compliance Mechanisms

Deep dives: e-way bill step-by-step, e-invoicing above Rs 5 crore, QRMP scheme, composition scheme, and ASMT-10 response.

The Seven Terms People Get Wrong

Step 1: GSTR-2A vs GSTR-2B.** 2A is dynamic; 2B is static and is the ITC basis. Reconcile against 2B.

Step 2: Zero-rated vs Exempt.** Zero-rated (exports/SEZ) allows an ITC refund; exempt does not. Exporting under the wrong label loses the refund.

Step 3: Composite vs Mixed Supply.** Composite = naturally bundled, taxed at the principal item's rate. Mixed = independent items for one price, taxed at the highest rate.

Step 4: Nil-rated vs Exempt vs Non-GST.** Nil-rated has a 0% rate; exempt is notified as exempt; non-GST (petrol, alcohol) is outside GST entirely.

Step 5: ITC eligibility.** ITC is allowed only if the invoice is in 2B, the supplier has paid, you have the goods/services, and you claim within the time limit.

Step 6: GSTR-1 vs GSTR-3B.** GSTR-1 reports sales invoice by invoice; GSTR-3B is the summary where tax is actually paid. Both must reconcile.

Step 7: Debit Note vs Credit Note.** A debit note raises value/tax; a credit note (returns/discounts) lowers it and has a reporting time-limit.

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Frequently Asked Questions

What is the difference between GSTR-2A and GSTR-2B?

GSTR-2A is a dynamic statement that keeps changing as suppliers file or amend their GSTR-1, even after the month ends. GSTR-2B is a static statement generated each month, and it is the basis for input tax credit you can claim in GSTR-3B. Reconcile your purchase register against GSTR-2B, not 2A, before filing.

What is the difference between zero-rated and exempt supplies?

Both carry no output GST, but they treat input tax credit differently. Zero-rated supplies, meaning exports and supplies to SEZ units or developers, let you keep credit on inputs and claim a refund of unused credit. Exempt supplies require you to reverse credit on inputs used for them, so the GST on those costs becomes part of your price.

How is a composite supply different from a mixed supply?

A composite supply is a naturally bundled set of goods or services with one principal item, such as a laptop sold with its charger and bag, and the whole bundle is taxed at the principal item's rate. A mixed supply combines independent items for a single price, such as a festive hamper, and the whole is taxed at the highest rate among them.

What does nil-rated, exempt and non-GST supply mean in GST returns?

Nil-rated supplies carry a 0% rate in the rate schedule, such as fresh vegetables. Exempt supplies are taxable in principle but freed from tax by notification, such as healthcare services. Non-GST supplies, such as petrol, diesel and alcohol for human consumption, are outside GST altogether. All three are reported separately in Table 8 of GSTR-1 and Table 3.1 of GSTR-3B.

When is a debit note issued instead of a credit note?

A supplier issues a debit note when the taxable value or tax on an earlier invoice needs to go up, for example after under-billing. A credit note reduces value or tax, for goods returned, post-sale discounts agreed in advance or excess billing. A credit note must be declared by 30 November after the end of the financial year, or the date of the annual return if earlier.

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Sources

Based on the CGST Act, 2017 and CGST Rules, the GST portal and its help documentation (gst.gov.in), CBIC notifications and circulars, and the e-invoice and e-way bill portals. Definitions are explained in plain English; confirm specific rates, thresholds, and dates against the official GST portal and CBIC notifications before filing.

GST Return Terms Explained: Your Complete GSTR Glossary