Inverted Duty Structure under GST

An inverted duty structure under GST occurs when the tax rate on inputs is higher than the tax rate on the goods or services supplied using them. It can cause input tax credit (ITC) to accumulate because the credit available on purchases may exceed the tax payable on outward supplies.

How the inversion works

GST normally allows a registered business to use eligible tax credit on purchases to discharge its output tax liability. An inverted rate structure can disrupt this flow by generating more credit than the business can utilise against its outward supplies.

• For example, if input goods attract 18% GST while the finished product attracts 5% GST, the rate structure is inverted; these rates are illustrative.
• Credit accumulation is not automatic merely because the input rate is higher: it also depends on purchase values, sales values and the business's other tax liabilities.
• The inversion concerns the relationship between input and output tax rates, not merely a high tax rate on the final product.

Treatment of accumulated credit

Section 54(3)(ii) of the Central Goods and Services Tax Act, 2017 permits refund of unutilised ITC accumulated because the tax rate on inputs exceeds that on output supplies, subject to statutory conditions and exclusions.

• For this purpose, inputs are goods other than capital goods used or intended to be used in the course or furtherance of business.
• The inverted-duty refund route does not cover output supplies that are nil-rated or fully exempt, and notified supplies may also be excluded.
• Rule 89(5) of the CGST Rules, 2017 prescribes the refund formula; the input-credit component used in this formula excludes credit on input services and capital goods.
• Credit eligibility and refund eligibility are distinct: credit that is otherwise admissible does not necessarily qualify for refund under the inverted-duty route.

Why it matters

Accumulated credit can lock up working capital, especially while a business awaits an admissible refund. Where credit remains unusable or is not refundable, it can increase the effective cost of production.

• A refund mechanism mitigates credit accumulation but requires businesses to meet documentation and procedural requirements.
• Rate rationalisation can address the underlying mismatch, but changing input or output rates also requires consideration of revenue, prices and effects across the supply chain.