Why “Supply” is the Pivot of GST Law
Every tax statute needs a clearly defined trigger point at which liability arises. Under the taxes that GST replaced, that trigger differed from law to law: manufacture for Central Excise, sale for VAT, rendition of service for Service Tax. One of the real achievements of GST has been to collapse all of this into a single taxable event: supply. Whether GST applies at all to a transaction, at what rate, whether CGST/SGST or IGST is chargeable, and whether input tax credit is available: every one of these questions ultimately traces back to how a transaction is characterised as a supply. In more than three decades of dealing with assessment, investigation and adjudication matters, I have found that most disputes at the ground level begin precisely here, not in the rate schedule, but in the classification of the transaction itself.
This note sets out, in practical terms, the different kinds of supply recognised under the CGST Act, 2017 and the IGST Act, 2017, and why the distinctions matter to a taxpayer or an officer.
What Qualifies as a “Supply”
Section 7 of the CGST Act casts a wide net. A transaction is ordinarily a supply when it involves a sale, transfer, barter, exchange, licence, rental, lease or disposal of goods or services, made for a consideration, by a person acting in the course or furtherance of business. Import of services for consideration is brought in as a supply even where it is not connected with any business. Beyond this general rule, Section 7 also pulls in certain activities specified in Schedule I even where no consideration passes, and it leaves the goods-versus-services classification of borderline transactions to Schedule II. Certain activities are carved out altogether by Schedule III and are not “supply” in law at all.
Illustration: A component manufacturer in Pune sells machined parts to a dealer in Mumbai for a price. This is a straightforward supply of goods for consideration in the course of business, and GST applies without any complication.
Deemed Supply: When Consideration is Absent
The general rule is that GST attaches only where consideration passes. Schedule I creates a deliberate exception, treating four categories of activity as supply even without consideration, principally to prevent leakage of tax through internal or related-party arrangements:
- Permanent transfer or disposal of a business asset on which input tax credit had earlier been claimed.
- Supply between related persons, or between distinct registrations of the same entity (for instance, two GST registrations of the same PAN in different States), where made in the course of business: gifts by an employer to an employee are excluded up to ₹50,000 in a financial year.
- Supply of goods between a principal and an agent, in either direction, where the agent undertakes to supply or receive goods on the principal's behalf.
- Import of services by a taxable person from a related person or from the person's own establishment outside India, in the course of business.
This is the provision most likely to catch an SSI unit unawares. A manufacturer moving stock from a factory in one State to its own depot in another State, two distinct registrations under the same PAN, is making a “supply” under Schedule I even though no invoice value changes hands in the conventional sense, and GST must be charged on the stock transfer.
What Falls Outside GST Altogether
Schedule III lists activities that are treated as neither a supply of goods nor of services, and are accordingly outside GST's reach. The commonly encountered entries include an employee's services to an employer under a contract of employment (i.e., salary), services of courts and tribunals, the functions of MPs, MLAs and holders of constitutional posts, funeral and burial-related services, sale of land, and, subject to an important exception, sale of a building. That exception is worth flagging: a sale of an under-construction building where any part of the consideration is received before the completion certificate is issued remains a taxable supply of service under Schedule II, not an exempt sale of immovable property. Actionable claims are also outside GST, except for lottery, betting, gambling and certain online money-gaming claims, which are specifically brought to tax.
Supply of Goods or Supply of Services: The Borderline Cases
Several everyday commercial arrangements do not sit comfortably under either label, and Schedule II settles the question by deeming a treatment. Renting out machinery without transferring title, leasing or letting out land or a building, job-work carried out on another person's goods, temporary transfer of an intellectual property right, and development or customisation of software are all deemed supplies of services. A works contract, and the supply of food or drink for consumption such as in a restaurant, are treated as composite supplies of services. By contrast, an outright transfer of title in goods, and a closing-down sale of business stock, remain supplies of goods.
Composite Supply and Mixed Supply: A Frequent Point of Confusion
Both concepts deal with two or more goods or services billed together, and the two are often conflated by taxpayers, sometimes to their disadvantage.
A composite supply [Section 2(30)] exists where the items are naturally bundled and supplied together in the ordinary course of business, such that one cannot reasonably be sold without the other: for example, goods supplied along with packing, freight and insurance under a single contract. Here, one supply is identified as the “principal supply,” and Section 8 provides that the entire bundle is taxed at the rate applicable to that principal supply.
A mixed supply [Section 2(74)] exists where the items are independent of each other, capable of being sold separately, but are combined for a single price: the standard illustration is a festive gift hamper of namkeen, chocolates and an aerated drink sold together. Section 8 taxes the entire mixed supply at the rate applicable to whichever item in it attracts the highest rate.
A working test I have found useful when examining such transactions: can the recipient reasonably buy one item without the other, in the ordinary course of business? If not, the supply is likely composite; if yes, and the items have simply been priced together, it is likely mixed.
It is worth noting here that the GST rate structure itself was substantially rationalised with effect from 22 September 2025, following the 56th GST Council meeting. The earlier four-tier structure of 5%, 12%, 18% and 28% (with compensation cess on certain items) was replaced by a simplified structure built primarily around 5% and 18% slabs, with a new 40% slab for select luxury and “sin” goods such as aerated beverages, tobacco products, high-end cars above certain specifications, and similar items, in addition to the unchanged special rates of 3% for gold/silver and 0.25% for rough diamonds. Any illustration of a mixed supply attracting “the highest rate” must therefore now be read against this revised slab structure rather than the pre-September 2025 rates.
Taxable, Exempt, Nil-Rated, Zero-Rated and Non-GST Supply
These terms are frequently used loosely in conversation, but each carries a distinct legal meaning with a different consequence for input tax credit, a distinction that matters both to a small taxpayer deciding whether registration is even required, and to an officer examining a credit reversal.
- Taxable supply [Section 2(108)]: chargeable to GST at the notified rate, with credit on inputs available.
- Nil-rated supply: within the scope of GST but specifically notified at a 0% rate; credit on inputs is not available.
- Exempt supply [Section 2(47)]: wholly exempt under Section 11 of the CGST Act or Section 6 of the IGST Act, and defined to include non-taxable supply within its wider meaning; credit is not available, and proportionate reversal is required for inputs common to taxable and exempt supplies.
- Zero-rated supply [Section 16, IGST Act]: exports and supplies to SEZ units or developers. No tax is charged on the outward supply, but, unlike an exempt supply, the transaction is treated as taxable for credit purposes, so input tax credit is fully available, with a refund mechanism for unutilised credit.
- Non-GST supply [Section 2(78)]: outside the purview of GST altogether: the standard examples remain alcoholic liquor for human consumption and the specified petroleum products (crude, petrol, diesel, ATF and natural gas), which continue to be taxed, if at all, under other Central or State levies pending a Council decision to bring them within GST.
The distinction worth remembering is that exempt and nil-rated supplies remain within the GST net but attract no tax and block credit, whereas zero-rated supplies are structured to keep exports tax-free at every stage of the value chain by protecting and even refunding credit. Non-GST supplies are not governed by GST law at all.
Inter-State versus Intra-State Supply
Once a transaction is established as a supply, the next question, governed by Sections 7, 8 and 9 of the IGST Act, is where it takes place, since this decides which tax applies.
An intra-State supply arises where the location of the supplier and the place of supply fall within the same State or Union Territory, and attracts CGST plus SGST (or CGST plus UTGST), each levied at half the applicable rate. An inter-State supply arises where the two fall in different States or Union Territories, and also covers imports, exports, and supplies to or by an SEZ; such a supply attracts IGST, collected by the Centre and apportioned to the destination State. A special rule under Section 9 deems supplies in the territorial waters to be located in the coastal State or Union Territory nearest to the relevant baseline.
A Practical Sequence for Classification
For anyone examining a transaction from scratch, I would suggest working through it in this order:
- Is it a supply at all, having regard to Section 7 and the exclusions in Schedule III?
- If made without consideration, is it nonetheless deemed a supply under Schedule I?
- Is it a supply of goods or of services, applying Schedule II to any borderline case?
- If it bundles more than one item, is it a composite supply (taxed at the principal supply's rate) or a mixed supply (taxed at the highest rate among the items)?
- Is it taxable, exempt, nil-rated, zero-rated or non-GST, and what follows for credit eligibility?
- Is it inter-State or intra-State, determining whether IGST or CGST+SGST/UTGST applies?
Correct classification at each of these steps determines the rate to be charged, the eligibility to claim credit, and in some cases whether registration is required at all: for instance, a person making only exempt supplies, or only supplies falling under Schedule III, is not required to register on that account alone. Given the amounts and disputes that often turn on these questions, transactions of any complexity or value are best examined against the statutory scheme before a tax position is finalised, and, where warranted, discussed with a tax professional or the jurisdictional officer.
This note is intended as a general professional reference and does not constitute legal advice.
