GST 2.0 and the Inverted Duty Structure: When a Rate Cut Costs You Working Capital

GST 2.0 reduced the rate structure to four slabs: 0%, 5%, 18% and 40%. The 12% slab was eliminated, with roughly 99% of its items moving down to 5% and the remainder to 18%. The 28% slab was restructured, with about 90% of its items moving to 18% and a narrow set of demerit and luxury goods moving up to the new 40% rate.

For most consumers this was a straightforward price cut. For businesses the effect depends entirely on one thing the rate tables do not show: what rate your inputs attract. Raw materials, packaging, machinery and most business services remain at 18%. If your output moved to 5% and your inputs did not move at all, your tax position inverted.

This is not a loophole or an oversight. It is the arithmetic consequence of cutting one side of a ledger and not the other, and it affects any sector where the output rate now sits below the input rate.

Under GST you pay tax on your inputs and collect tax on your outputs, then remit the difference. When the two rates are similar, the credit you accumulate on purchases is roughly cancelled by the tax you collect on sales, and little cash is tied up.

An inverted duty structure occurs when the rate on inputs exceeds the rate on outputs. You keep paying 18% on everything you buy, but you only collect 5% on what you sell. The credit does not disappear, but it also does not get used, so it accumulates on your GST ledger as money you have paid out and cannot deploy.

The counterintuitive result is that a business whose tax rate was cut can find its working capital requirement going up, not down. The amount is not small, and it scales with turnover.

Take a packaged food manufacturer whose output moved from 12% to 5%. Monthly figures: Rs 10,00,000 of goods inputs (raw material and packaging) at 18%, giving Rs 1,80,000 of credit. Rs 2,00,000 of input services (rent, logistics, professional fees) at 18%, giving Rs 36,000. Total credit availed: Rs 2,16,000. Monthly sales: Rs 15,00,000.

Before GST 2.0, output tax at 12% on Rs 15,00,000 was Rs 1,80,000. Against Rs 2,16,000 of credit, Rs 36,000 accumulated each month. Noticeable, but manageable.

After GST 2.0, output tax at 5% is Rs 75,000. Against the same Rs 2,16,000 of credit, Rs 1,41,000 now accumulates each month. The rate cut did not change a single input cost, yet the credit piling up on the ledger went up roughly fourfold, from Rs 36,000 to Rs 1,41,000 a month. That is Rs 16.9 lakh over a year of cash sitting in the GST system rather than in the business.

Section 54(3)(ii) of the CGST Act allows a refund of credit accumulated because of rate inversion, and Rule 89(5) sets the formula. In its current form, as amended by Notification 14/2022, the maximum refund equals the turnover of inverted rated supply multiplied by Net ITC and divided by adjusted total turnover, minus the tax payable on that inverted rated supply multiplied by the ratio of Net ITC to total credit availed on inputs and input services.

The decisive term is Net ITC. It means credit on inputs, which is goods. It excludes credit availed on input services and on capital goods. So the formula deliberately returns only the goods portion of what accumulated.

Running the example through it: turnover of inverted supply Rs 15,00,000, Net ITC Rs 1,80,000, adjusted total turnover Rs 15,00,000, tax payable Rs 75,000, total credit availed Rs 2,16,000. The maximum refund works out to Rs 1,17,500. Against Rs 1,41,000 accumulated, Rs 23,500 a month is not refundable at all. Over a year that is Rs 2,82,000 of credit that is paid, accumulated, and permanently stranded.

Work the formula through algebraically and the result collapses to something simple. The credit you can never recover equals the credit availed on input services, multiplied by one minus the ratio of output tax to total credit availed.

In plain terms: the stranded amount is driven entirely by how much of your input tax sits on services rather than goods. A business buying only goods strands nothing. A business with heavy rent, logistics, warehousing or professional fees strands a great deal.

Holding total inputs at Rs 12,00,000 and sales at Rs 15,00,000, and varying only the split between goods and services: at a 0% service share nothing is stranded; at 10%, Rs 14,100 a month or Rs 1.69 lakh a year; at 25%, Rs 35,250 a month or Rs 4.23 lakh a year; at 40%, Rs 56,400 a month or Rs 6.77 lakh a year. The monthly accumulation is identical in every case at Rs 1,41,000. Only the recoverable share moves.

This is the figure most GST 2.0 coverage omits. The rate tables tell you what changed. They do not tell you that two businesses with the same turnover and the same total input tax can face very different permanent losses depending purely on whether they buy goods or services.

The GST Council approved provisional refunds of 90% of accumulated credit in inverted duty structure cases, effective 1 November 2025. On the example above, that releases Rs 1,05,750 of the Rs 1,17,500 refundable amount quickly, with the Rs 11,750 balance following after verification.

This is a real improvement and it addresses the timing problem, which for many businesses was the more painful one. Credit that used to sit for months awaiting scrutiny now largely returns on a provisional basis.

It does not touch the structural problem. The 90% is 90% of what Rule 89(5) deems refundable, not 90% of what accumulated. The Rs 23,500 a month attributable to input services is outside the formula entirely, so no change to refund speed recovers it.

First, establish whether you are actually inverted. Compare the weighted rate on your inputs against the rate on your outputs. If outputs are at 5% and inputs at 18%, you are. If your output moved from 28% to 18% while inputs stayed at 18%, you are not.

Second, file refund claims monthly rather than letting credit build. The provisional refund mechanism works on what you claim, and an unclaimed balance is simply working capital you have lent to the government at zero interest.

Third, quantify the stranded portion using your own input-service share before you plan pricing. If a quarter of your input tax sits on services, roughly a quarter of the accumulation is unrecoverable, and that is a real cost of goods sold that needs to appear in your margin calculation rather than being discovered at year end.

The composition scheme is sometimes suggested as an escape. It is available below Rs 1.5 crore of turnover (Rs 75 lakh in the north-eastern states and Himachal Pradesh) at 1% for traders and manufacturers, 5% for restaurants not serving alcohol, and 6% for eligible service providers. But a composition dealer cannot claim input tax credit at all, so it does not solve an inversion problem. It replaces it with a different one, and only makes sense if your input tax is small relative to turnover.