Short answer: where your inputs are taxed higher than your output, credit accumulates and a refund route exists. It covers inputs only — not input services or capital goods — and the prescribed formula apportions what remains. The refund is real, and it is reliably smaller than the balance in your ledger.
What qualifies
An inverted duty structure is a rate mismatch: tax on inputs exceeds tax on the output supply, so each period generates more credit than the output liability can absorb.
That is different from a temporary accumulation. A business that stocked up, or had a slow quarter, has a timing balance that later sales will consume. There is no refund route for that, and none is needed.
Common in manufacturing where a finished good sits at a lower rate than its principal raw materials — textiles, footwear, fertilisers, certain engineering and food-processing lines, among others.
The September 2025 rate rationalisation changed this map. Moving to a predominantly two-rate structure resolved some long-standing inversions and could create others. A business that concluded years ago that it was or was not inverted should re-test that against its current rate profile rather than carrying forward the earlier conclusion.
The three reasons the refund is smaller
1. Input services and capital goods are excluded
Refund under this route reaches credit on inputs — goods — only. Credit on input services and capital goods stays in the ledger.
The Supreme Court upheld that exclusion, so it is settled rather than arguable. For a manufacturer with substantial service costs — job work, freight, professional fees, plant maintenance — this is usually the single largest gap between the accumulated balance and the refund received.
2. The formula apportions by turnover
The refund is not "credit on inputs, less output tax". It is computed by a prescribed formula that scales net input credit by the ratio of inverted-rated turnover to total turnover, and then subtracts the output tax payable on the inverted supply.
The consequence: any non-inverted turnover dilutes the claim. A manufacturer with an inverted core product and a normally-rated sideline recovers less than the inversion alone would suggest, because the formula does not care which inputs went to which line.
3. Output tax is netted at the end
The deduction of output tax payable on the inverted supply is the last step, and it is the one most often omitted in a self-computed expectation.