IGST Refund for Exporters in India: Inverted Duty Structure Changes from October 2025

An inverted duty structure in India arises when the GST rate on inputs exceeds the GST rate on outputs, causing Input Tax Credit (ITC) to accumulate. Under the GST framework, exporters facing this structure can claim a refund of unutilised ITC. CGST Instruction 6/2025, effective 1 October 2025, introduced a 90% provisional refund mechanism for such cases, the biggest operational shift for exporters since GST rollout.

What Is an Inverted Duty Structure Under GST in India?

An inverted duty structure exists when the GST rate paid on inputs is higher than the GST rate charged on outputs. The exporter accumulates Input Tax Credit that cannot be fully utilised because the output GST collected is lower than the input GST paid. This creates a working capital blockage that grows with every production cycle.

What this means in practice: Exporters in affected sectors effectively pay more GST on their inputs than they collect on their outputs. The accumulated credit cannot be used against other tax liabilities - it just sits in the ledger. CGST Instruction 6/2025, effective 1 October 2025, addresses this by allowing a 90% provisional refund of that accumulated ITC.

Common examples of inverted duty structures in Indian manufacturing:

Source: ClearTax (CBIC rate data)

The October 2025 Changes: CGST Instruction 6/2025 and the 90% Provisional Refund

The short answer: Exporters facing an inverted duty structure can now receive 90% of their accumulated ITC refund provisionally, with the remaining 10% released after officer verification. The source is CGST Instruction 6/2025, issued on 3 October 2025 and effective from 1 October 2025.

This represents the biggest operational shift for exporters since GST rollout. Before this instruction, exporters had to wait for complete officer verification before any disbursement - a process that routinely took 3 to 6 months under the previous framework. That waiting period left working capital trapped in accumulated ITC with no immediate relief. The 90% provisional mechanism moves the money faster by releasing the majority of the refund upfront, while the remaining 10% is held pending final verification.

Exporters filing refund applications after 1 October 2025 fall under this mechanism. They still need to file GSTR-1 and GSTR-3B, generate an ARN, and submit documents to the jurisdictional officer - the disbursement schedule is what changed.

Important: CGST Instruction 6/2025 is currently a provisional administrative measure. The necessary amendments to the CGST Act are still pending as of April 2026.

Inverted Duty Structure Refund Formula: How to Calculate Your Claim

The formula determines how much of your accumulated ITC is actually refundable. It works by calculating the proportion of your ITC that relates specifically to inverted supplies - your inputs taxed higher than your outputs - then subtracting the GST payable on those same outputs.

Refund = ((Turnover of Inverted Supplies x Net ITC) / Adjusted Total Turnover) minus Tax on Inverted Supplies

Breaking down the components:

• Turnover of Inverted Supplies is the revenue from goods where the input GST rate exceeds the output GST rate.
• Net ITC is total ITC availed minus any ITC reversed.
• Adjusted Total Turnover is total turnover including exports, minus exempt and nil-rated supplies. Getting this denominator wrong is one of the most common causes of reduced refund amounts.
• Tax on Inverted Supplies is the GST payable on the inverted supply itself.

The formula is unforgiving of errors. Small mistakes in the denominator or numerator will miscalculate your final refund amount.

Who Can and Cannot Claim an IGST Refund for Inverted Duty Structure

Eligible claimants include manufacturers and service providers who export and face a genuine rate inversion between inputs and outputs.

Exclusions are important:

• Pure trading entities are excluded. Multiple expert opinions, including those published on Taxmann, confirm that traders with no manufacturing activity do not qualify.
• Exporters whose output supplies are nil-rated or fully exempt are generally ineligible, unless those exempt goods serve as inputs to other taxable supplies.
• Entities who have structured their operations differently under the Job Work provisions may face restricted eligibility.
• Businesses that have created an inverted structure through incorrect classification are not just ineligible. Wrong classification is a compliance risk on its own.

The trader exclusion is the most contested area of IDS refunds. Several court cases and advance rulings have examined it. The consistent position is that only entities with genuine manufacturing or service provision, where the rate inversion arises from the production process itself, qualify.

Step-by-Step: How to File for IGST Refund Under Inverted Duty Structure (RFD-01A)

1. File GSTR-1. Report all outward supplies including exports. This establishes the turnover of inverted supplies.
2. File GSTR-3B. Claim ITC on inputs and pay GST on outputs. This creates the ITC ledger.
3. File RFD-01A on the GST portal. Select "Accumulated ITC due to inverted duty structure" as the refund type.
4. Receive your ARN. The Application Reference Number confirms the portal has accepted your filing.
5. Submit supporting documents to the Jurisdictional Officer. This includes the reconciliation statement, export invoice details, and GSTR-1 and GSTR-3B proofs. The 90% provisional amount is processed within the standard refund timeline after this.
6. Receive 90% of the refund provisionally. The remaining 10% is held back pending verification.
7. Receive the balance 10%. This is released after the jurisdictional officer completes verification.

The filing deadline is two years from the end of the financial year in which the refund claim arises, per Section 54 of the CGST Act. Miss it and the claim is time-barred.

Getting the GSTR-1 and GSTR-3B reconciliation right before filing RFD-01A matters. Mismatches between the two returns trigger officer scrutiny and delays. Eximoz automates GSTR-1 and GSTR-3B reconciliation to ensure your IDS refund claim is accurate and filed on time.

Common Mistakes to Avoid When Claiming IDS Refund

Exporters regularly leave money on the table or get claims rejected for reasons that are entirely preventable.

Getting the Adjusted Total Turnover wrong. Including exempt or nil-rated supplies in the denominator reduces the refund amount directly. The formula uses this figure to calculate the proportion of ITC attributable to inverted supplies. An inflated denominator produces a smaller refund.

Filing outside the two-year window. Section 54 of the CGST Act is clear. There is no extension, no relaxation, and no appeal against the limitation. Two years from the end of the financial year in which the refund claim arises is the hard cutoff.

GSTR-1 and GSTR-3B mismatches. The officer reviewing your refund will compare these returns. Any discrepancy gets flagged, triggering a detailed inquiry. Resolving an inquiry adds weeks or months to the process.

Trader classification. The single most common reason for rejection. Pure trading entities are outside the scope of IDS refund eligibility. Knowing your entity classification before filing prevents a futile application.

Missing Job Work restructuring disclosures. If your operations use Job Work provisions, the filing must reflect the correct structure. Inconsistent disclosures create ambiguity that officers will probe.

Not claiming when eligible. This is the mistake that costs the most. Manufacturers in sectors like textiles, electronics components, and industrial equipment frequently face inverted duty structures without realising they qualify for a refund.

Frequently Asked Questions

What is an inverted duty structure under GST in India?

An inverted duty structure under GST in India occurs when the tax rate on inputs (raw materials) is higher than the tax rate on outputs (finished goods), causing Input Tax Credit to accumulate with the exporter. This is common in capital-intensive manufacturing sectors where components attract higher GST rates than the final product. A textile manufacturer, for instance, may pay 12% GST on fabric inputs but charge only 5% GST on the exported finished garment.

How do I claim IGST refund for inverted duty structure in India?

To claim an IGST refund for inverted duty structure in India, file RFD-01A on the GST portal after filing GSTR-1 and GSTR-3B, within two years from the end of the financial year in which the refund claim arises. The ARN is generated on successful filing and the refund is processed in two stages under CGST Instruction 6/2025.

What is the 90% provisional refund under CGST Instruction 6/2025?

Under CGST Instruction 6/2025, effective 1 October 2025, exporters facing inverted duty structure can receive 90% of their accumulated ITC refund provisionally, with the remaining 10% released after officer verification. This is a significant improvement over the previous full-verification-before-disbursement model.

Can traders claim inverted duty structure refund?

No, pure trading entities are excluded from claiming inverted duty structure refund under the CGST Act. Only manufacturers and service providers with genuine rate inversion between inputs and outputs are eligible. This position is supported by multiple advance rulings and court cases - the consistent interpretation is that trading activity without manufacturing or processing does not give rise to a genuine inverted duty structure arising from the production process itself.

What is the formula for calculating inverted duty structure refund?

The refund amount equals ((Turnover of Inverted Supplies multiplied by Net ITC) divided by Adjusted Total Turnover) minus the GST payable on the inverted supplies. The Adjusted Total Turnover excludes exempt and nil-rated supplies - including these in the denominator is one of the most common calculation errors. Getting the denominator right is critical; an inflated Adjusted Total Turnover directly reduces your refund amount.

Is CGST Instruction 6/2025 fully enacted?

CGST Instruction 6/2025 is currently a provisional administrative measure. The necessary amendments to the CGST Act are still pending as of April 2026. Exporters should track legislative developments.

Sources: CBIC Customs Tariff Schedule (2025-26) | CGST Instruction 6/2025 dated 3 October 2025 | ClearTax Inverted Duty Structure Guide | DGFT ITC-HS Classification | tutorial.gst.gov.in (RFD-01A filing guide)