GST Exemptions: Nil-Rated, Exempt, and Zero-Rated Supplies Explained

GST exemptions decoded: the difference between nil-rated, exempt, and zero-rated supplies and how Rule 42 affects ITC apportionment.

Three Categories That Look Similar But Are Very Different

Indian GST uses three terms that beginners often confuse: nil-rated, exempt, and zero-rated. Nil-rated supplies attract 0 percent GST under Schedule I of the rate notifications (think unbranded atta, milk, and fresh vegetables). Exempt supplies are notified under Section 11 of the CGST Act and Section 6 of the IGST Act and include healthcare services, education, and agricultural produce. Zero-rated supplies under Section 16 of the IGST Act cover exports and supplies to SEZ. The tax rate is zero in all three, but the ITC treatment is fundamentally different.

Nil-Rated vs Exempt: The ITC Difference

For both nil-rated and exempt supplies, the supplier cannot collect GST from the customer and cannot claim ITC on inputs used to make those supplies. Where the supplier deals exclusively in exempt or nil-rated supplies, GST registration is not even required. The practical impact is that the input GST becomes a cost and gets baked into the price. Pharmacies, schools, and hospitals therefore see GST as a pure cost rather than a flow-through tax.

Zero-Rated Supplies: The Best of Both Worlds

Zero-rated supplies are the cleanest category — the output GST is zero but the supplier can claim full ITC on inputs. The unutilized credit can be claimed as a refund in cash, making exports and SEZ supplies effectively tax-free at every stage. This is the constitutional design that keeps Indian exports competitive globally. The mechanism is operationalized through either the LUT route (no IGST paid upfront) or the with-payment-of-tax route (IGST paid and refunded).

Rule 42 and 43: Apportioning ITC for Mixed Supplies

When a business makes both taxable and exempt supplies (think a hospital that runs both a pharmacy and a hospital, or a coaching institute that sells books), ITC on common inputs must be apportioned between taxable and exempt turnover under Rule 42 (for inputs and input services) and Rule 43 (for capital goods). The formula reverses ITC proportionate to exempt turnover share, and the calculation is provisional each month with a final true-up by 30 September of the following year. Missing the annual reconciliation is a leading source of demand notices.

Handling Mixed Supplies With BillBabu

BillBabu lets you tag every outward supply as taxable, exempt, nil-rated, or zero-rated, and tag every purchase invoice as exclusively-taxable, exclusively-exempt, or common. The monthly Rule 42/43 computation runs automatically using the prescribed formula, and the September true-up is generated with a single click. For pharmacies attached to clinics, schools selling uniforms, and hospitals operating canteens, this single workflow removes the highest-risk area of their GST compliance.

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