GST Composition Scheme: Invoice Rules Explained

The one rule that matters most: if you're registered under the GST composition scheme, you cannot charge GST on your invoices at all — you issue a Bill of Supply instead of a tax invoice, and the tax you owe comes out of your own margin at a flat scheme rate. Get this backwards and you're both violating the scheme's conditions and overcharging your customer.

Who can actually opt for the composition scheme?

The scheme is aimed at small goods businesses. Eligibility generally requires aggregate turnover up to ₹1.5 crore in the preceding financial year (₹75 lakh in north-eastern and hill states). It excludes casual taxable persons and non-resident taxable persons outright, and — this is the part that surprises most freelancers — it excludes most service providers entirely, with restaurant services as the one notable exception. If you're a consultant, designer, developer, or any other typical services freelancer, the composition scheme almost certainly isn't available to you; it's built for small traders and manufacturers of goods.

Why can't a composition dealer issue a tax invoice?

This is the defining constraint of the scheme, and it's not optional. A composition dealer pays GST at a flat, low scheme rate calculated on their turnover — but they are legally barred from charging that tax (or any GST) separately to their customers. Since a tax invoice's entire purpose under Rule 46 is to show the GST rate and amount charged, a composition dealer simply has nothing to put in that field — so instead of a tax invoice, they issue a Bill of Supply, the document reserved for exactly this situation and for exempt/nil-rated sales.

What does a composition dealer's Bill of Supply need to say?

Beyond the standard Bill of Supply fields (supplier details, a serial number, date, description of goods, value), a composition dealer's Bill of Supply must carry a specific declaration at the top: "composition taxable person, not eligible to collect tax on supplies." This isn't boilerplate — it's the document's way of telling the buyer, in writing, why no GST appears on it, and it doubles as a signal that the buyer cannot claim input tax credit on this purchase.

Worked example: the same ₹10,000 sale, two ways

Notice the price the customer sees is identical in both cases in this example — the composition dealer isn't charging less, they're simply not itemizing tax separately, and absorbing it themselves at whatever rate their scheme category carries.

No input tax credit, either direction

Opting into the composition scheme takes a business out of the ITC chain entirely. A composition dealer cannot claim credit for the GST they paid on their own business purchases, and — because their Bill of Supply shows no GST — their customers can't claim any ITC on what they bought either. This is a real trade-off businesses should weigh deliberately: the composition scheme simplifies compliance and lowers the effective tax rate, but it also removes ITC eligibility on both sides of every transaction.

Simpler filing, but a real trade-off

The scheme's genuine upside is compliance simplicity: composition dealers file a quarterly return (Form GSTR-4) instead of the monthly GSTR-1/GSTR-3B cycle regular taxpayers manage, and their tax calculation is a flat rate on turnover rather than line-by-line GST accounting. For a small trader with thin margins and limited accounting bandwidth, that's a meaningful reduction in overhead — but it comes bundled with the invoicing and ITC restrictions above, so it's worth evaluating deliberately rather than defaulting into it. Confirm current turnover thresholds and eligibility specifics on the GST portal before opting in, since these limits are set by notification and can be revised.

Common mistakes to avoid

• Issuing a tax invoice with GST shown, out of habit, after registering under the composition scheme — this directly violates the scheme's core condition.
• Forgetting the mandatory "composition taxable person" declaration on the Bill of Supply.
• Assuming a services business qualifies — most service providers are excluded outright, restaurants aside.
• Not accounting for the fact that customers can't claim ITC on composition purchases, which can be a real consideration for B2B buyers deciding who to buy from.

If you're not on the composition scheme, the more common document choice is between a regular tax invoice and a Bill of Supply for exempt sales — see our GST Invoice vs Bill of Supply guide for that decision, or QWIK INVOICE's invoice generator if you're ready to create a compliant regular tax invoice.