Inverted duty structure: GST refund process
An inverted duty structure occurs when the GST rate charged on inputs is higher than the GST rate charged on the output supply, causing input tax credit to accumulate faster than it can be used. GST rules allow this unutilised credit to be claimed back through a formula-based refund, though the formula only accounts for ITC on inputs — not input services or capital goods — which is a frequent source of confusion.
What causes an inverted duty structure
This situation arises when raw materials or components are taxed at a higher GST rate than the finished product — for example, certain textile inputs taxed at a higher slab than the finished garment, or specific footwear components taxed higher than footwear under Rs 1,000. Because output tax liability ends up lower than the credit available, the excess accumulates instead of being fully absorbed month to month.
Industries where this is common
Textiles, footwear, fertiliser manufacturing, and certain renewable energy equipment are among the sectors most frequently affected by inverted duty structures, given the way input and output rates are structured for these categories. Businesses in these sectors typically need to monitor and claim this refund on an ongoing basis rather than as a one-off event.
The refund formula and its limits
The refund is computed based on the turnover of the inverted-rate supply, the net input tax credit for the period, and the adjusted total turnover, less the tax already payable on that supply. A key restriction to be aware of: the "net ITC" used in this formula is limited to credit availed on inputs (raw materials and goods) during the period — credit on input services and capital goods is excluded from the calculation, even though it may otherwise be available for other purposes. This exclusion is a common source of confusion when the numbers don't match a business's internal expectations.
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Talk to a CA →Filing the claim
The refund is filed as RFD-01 under the "Refund on account of Inverted Duty Structure" category, along with a statement of inward and outward supplies for the relevant period and supporting invoices. The claim covers a tax period or a consolidated period across multiple months, subject to the two-year time limit from the relevant date.
Points that commonly trigger scrutiny
Officers frequently examine whether the inputs claimed actually correspond to the output supply in question (rather than being used for an unrelated product line with a different rate structure), and whether the HSN/SAC classifications used are consistent with what's declared elsewhere in the business's returns. Keeping a clear input-output mapping ready in advance makes the review process considerably smoother.
Does the inverted duty refund formula include credit on input services?
No. The formula used for inverted duty structure refunds is based on 'net ITC' availed on inputs only — credit on input services and capital goods is excluded from this specific calculation, even though such credit may be usable elsewhere in the business. This is one of the most common points of confusion for businesses estimating their refund amount, since it's often lower than a straightforward reading of 'accumulated credit' would suggest.
This article is for general information only. For your specific situation, consult a practicing CA.
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