A startup rarely has a single revenue line. Subscription fees, platform commissions, advertising income, implementation charges, support retainers, marketplace fees and one-time setup fees can all sit within the same legal entity. For GST purposes, the question is not whether these revenues are taxable—most are taxable at 18% where the recipient is in India—but whether a bundled offering is a composite supply with a principal supply, or a mixed supply of separable deliverables. The answer determines the rate applied to the entire bundle, the invoice description, and the ITC position.
The Statutory Framework: Composite Supply and Mixed Supply
Section 2(30) of the CGST Act defines a composite supply as two or more supplies that are naturally bundled and supplied in conjunction with each other in the ordinary course of business, one of which is a principal supply. Section 2(74) defines a mixed supply as two or more individual supplies made in conjunction with each other for a single price, where the supply does not constitute a composite supply.
The consequence is set out in Section 8. A composite supply is treated as a supply of the principal supply, and the rate applicable to the principal supply applies to the entire bundle. A mixed supply is treated as a supply of the individual supply attracting the highest rate of tax, and that rate applies to the entire bundle.
The distinction is not about the number of components; it is about whether the components are naturally bundled around a principal supply, or merely sold together for a single price.
The Principal-Supply Test in Practice
A SaaS startup that offers cloud storage with onboarding support, chat support and configuration assistance under one plan is typically supplying a composite supply in which cloud storage is the principal supply and the support services are ancillary. The rate applicable to the cloud service applies to the bundle.
A startup that sells a software licence together with a separate consulting engagement, a separate training package and a separate hardware device for a single price has a harder composite-supply argument if the components are not naturally bundled around a single principal supply. If the components are separable and the single price is merely a commercial convenience, the mixed-supply rule may apply, and the highest-rate component determines the rate on the entire bundle.
The practical test is functional and commercial: does the customer come for one dominant supply, with the other components incidental to it, or is the customer buying a package of distinct supplies that could sensibly be priced and supplied separately? The answer should be reflected in the contract, the invoice and the actual delivery.
Turnover Aggregation and Registration
Aggregate turnover is computed on an all-India, PAN-based basis and includes taxable, exempt and zero-rated supplies. A startup with multiple revenue streams cannot compute the threshold separately for each stream. Subscription income, commission income, advertising income, implementation fees and marketplace fees are aggregated.
Where the startup supplies through a marketplace, the marketplace may collect tax at source under Section 52 of the CGST Act, but the startup remains responsible for its own registration and return obligations. The TCS credit appears in the startup’s electronic cash ledger and can be used against output tax.
ITC Consequences of a Mixed Revenue Model
Where a startup has both taxable domestic supplies and zero-rated exports, or both taxable supplies and exempt supplies, the common input tax credit must be apportioned under the rules. The credit attributable to zero-rated supplies is not reversed; it is accumulated and refunded. The credit attributable to exempt supplies is reversed. The credit attributable to taxable supplies is retained.
The apportionment exercise is fact-intensive and should be supported by a reasonable and consistently applied methodology. A startup that claims full credit without apportioning against exempt or non-business use is exposed to a reversal demand.
Contract and Invoice Discipline
The startup’s GST position on multiple revenue streams is determined largely before the invoice is issued. The contract should define the principal supply and the ancillary components, or clearly separate distinct supplies if the intention is to price them separately. The invoice should describe the supply consistently with the contract and the SAC. A generic “services” description on every invoice across different revenue lines creates avoidable classification risk.
Where a bundled offering is genuinely composite, the invoice should identify the principal supply and the bundle. Where the offering is genuinely mixed, the invoice should reflect the separable components and the pricing logic. The startup should avoid the common error of treating every bundled offering as composite by default merely because a single price is charged.
What the Startup Should Control
The startup’s GST risk in a multi-revenue model is concentrated in classification and documentation. The rate on each individual revenue line is usually 18%; the variable is whether the bundle takes the principal supply’s rate or the highest-rate component’s rate. The startup that controls the contract, the invoice and the delivery to match the chosen characterisation is in a stronger position than one that relies on a generic “software services” label across a diverse revenue base.
Call to Action: We advise startups with multi-stream revenue models on GST classification, composite-supply structuring, turnover aggregation and ITC apportionment. For a compliance review tailored to your revenue architecture, contact office@anujdesaiassociates.com, Ph No. 9619456656, Website https://anujdesaiassociates.com, LinkedIn linkedin.com/in/ca-anuj-desai-122547230.