The Central Board of Indirect Taxes and Customs (CBIC) has notified 1 November 2026 as the date from which Sections 153 to 155 of the Finance Act, 2026 will take effect for the Goods and Services Tax (GST). The changes extend 90 percent provisional refunds to inverted duty structure claims and remove the ₹1,000 floor for refunds of tax paid on goods exported out of India. The move is expected to release working capital faster for manufacturers and small exporters.
What Is Inverted Duty Structure in GST?
The inverted duty structure under GST arises when the tax on inputs exceeds the tax on output supplies. The gap leaves unutilised input tax credit (ITC) in the electronic credit ledger. Section 54(3) of the Central Goods and Services Tax (CGST) Act, 2017 allows refund of this accumulation in specified cases.
A simple example makes the idea clear. A maker buys raw material that attracts 18 percent GST and sells the finished product that attracts 5 percent GST. The maker pays more tax on purchases than it collects on sales, so credit keeps building up and cannot be fully used against output liability.
The refund is not available in every case of accumulation. The CGST Act bars refund where the output supply is nil rated or fully exempt, because no ITC chain exists in such cases. The government has also notified specific goods, such as certain edible oils and coal, for which inverted duty refund is not allowed.
The maximum refund for such claims is fixed by Rule 89(5) of the CGST Rules, 2017. The rule compares the turnover of lower rated output supplies with the total adjusted turnover and subtracts the tax payable on those outputs.
| Term in Rule 89(5) Formula | What It Means |
|---|---|
| Net ITC | ITC availed on inputs during the relevant period |
| Turnover of inverted rated supply | Value of output supplies taxed at a lower rate than inputs |
| Adjusted total turnover | Total turnover after excluding exempt and specified supplies |
| Tax payable | GST payable on the inverted rated output supplies |
From 1 November 2026, Net ITC for this formula becomes wider. ITC on eligible input services availed on or after that date will also count. ITC on capital goods attributable to the relevant period will count from 1 April 2027, spread over 60 months at one sixtieth per month.
What Did CBIC Notify for 1 November 2026?
CBIC Notification No. 03/2026 dated 26 October 2026 fixed 1 November 2026 as the date for Sections 153 to 155 of the Finance Act, 2026. These sections amend Sections 15, 34 and 54 of the CGST Act, 2017. The package covers post supply discounts, provisional refunds and export refund limits.
Parliament had already passed these amendments in the Finance Act, 2026, which was enacted in March 2026 after the Union Budget for 2026-27. The amendments could not operate until the central government appointed a commencement date under Section 1(2)(b) of the Finance Act. CBIC, acting for the central government, has now appointed that single common date.
| Finance Act Provision | CGST Provision Amended | Change From 1 November 2026 |
|---|---|---|
| Section 153 | Section 15(3)(b) on value of supply | Post supply discount can be excluded without a pre supply agreement if a credit note is issued and ITC is reversed |
| Section 154 | Section 34(1) on credit notes | Discounts covered by Section 15(3)(b) are expressly recognised as a ground for issuing a credit note |
| Section 155(a) | Section 54(6) on provisional refunds | 90 percent provisional refund extended to eligible inverted duty structure claims |
| Section 155(b) | Section 54(14) on minimum refunds | ₹1,000 floor removed for refunds of tax paid on goods exported out of India |
The discount changes ease an older condition. Earlier, a post supply discount could reduce taxable value only if it was fixed by an agreement made at or before the time of supply and linked to specific invoices. Now the supplier must issue a credit note and the recipient must reverse the matching ITC. The prior agreement and invoice linkage conditions have been removed.
How Will the 90 Percent Provisional Refund Work?
The amended Section 54(6) allows 90 percent of an eligible inverted duty refund to be sanctioned provisionally after acknowledgement, with the balance settled after final scrutiny. The common portal generates the provisional order in Form GST RFD-04 within three working days. Risk evaluation by the system decides eligibility.
Earlier, Section 54(6) gave this fast track only to zero rated supplies, which include exports and supplies to Special Economic Zones. Refunds under the inverted duty structure had to wait for full scrutiny. An interim trade facility from 1 October 2025 had allowed a similar 90 percent provisional payment for inverted duty claims. The Finance Act amendment now gives the facility a permanent legal base in the CGST Act itself.
The wider refund system has also been tightened for speed. The time for the officer to issue an acknowledgement in Form GST RFD-02 or a deficiency memo in Form GST RFD-03 has been cut from 15 days to 10 days. If no action is taken in 10 days, the application is treated as acknowledged by the system. The final refund order must still follow within 60 days from the date of filing under Section 54(7).
Safeguards continue to apply. Provisional refund is not available to a person prosecuted in the five years before the tax period for an offence where tax evaded exceeds ₹250 lakh. Notified categories, including suppliers of items such as pan masala, tobacco and related goods, and persons who have not completed Aadhaar authentication, are also kept outside the provisional route. Cases where a demand or appeal adjustment applies are sent for detailed scrutiny instead of automatic release.
Why Does Removal of the ₹1,000 Limit Matter for Small Exporters?
Section 54(14) earlier barred any GST refund below ₹1,000. The amendment removes this floor only for refunds of tax paid on goods exported out of India. Small exporters with low value parcels can now recover the full Integrated GST paid, even if the claim is a few hundred rupees.
The older floor was meant to save administrative cost. In practice, it hurt micro, small and medium enterprises that ship handicrafts, samples and direct to consumer parcels through courier or post. A parcel worth ₹5,000 at 5 percent GST carries only ₹250 as tax. That amount was lost forever under the old rule. Over hundreds of parcels, the loss became large and went against the principle that taxes should not be exported.
The change is narrow. It applies to export of goods made with payment of tax, where Integrated GST (IGST) is paid and then claimed back through the Customs ICEGATE system. It does not remove the ₹1,000 limit for other categories. Refunds of unutilised ITC on exports under a Letter of Undertaking (LUT), refunds on export of services, and refunds of excess cash ledger balance still face the threshold.
| Refund Type | ₹1,000 Floor After 1 November 2026 |
|---|---|
| Tax paid on goods exported out of India | Removed, even small sums are payable |
| Export under LUT claiming unutilised ITC | Floor continues |
| Export of services | Floor continues |
| Excess balance in electronic cash ledger | Floor continues |
What Is CBIC and What Is the Finance Act?
CBIC stands for the Central Board of Indirect Taxes and Customs. CBIC works under the Department of Revenue in the Ministry of Finance and is the apex body for administering GST, customs and central excise. It was earlier called the Central Board of Excise and Customs and was renamed in 2018 after GST was launched.
CBIC is headed by a Chairperson and issues notifications, circulars and instructions for field formations across India. The Chairperson of CBIC is a permanent invitee to all proceedings of the GST Council. The present notification was issued by CBIC in exercise of powers given by the Finance Act itself.
The Finance Act is the annual law that gives legal effect to the tax proposals in the Union Budget. The Finance Act, 2026 was enacted in March 2026 and amended the CGST Act, 2017, the Integrated GST Act, 2017 and other tax laws. Sections 153 to 155 of that Act contain the GST changes discussed in this article. Such provisions start only on the date the central government appoints, which is why a separate commencement notification was needed.
How Does GST Work in India?
GST is a destination based indirect tax on the supply of goods and services in India. It replaced central excise, service tax, VAT and other levies from 1 July 2017. Central GST and State GST apply to intra state sales, while Integrated GST applies to inter state sales and imports.
GST is calculated on the transaction value. The tax equals price multiplied by the rate. A product priced at ₹1,000 in the 18 percent slab carries GST of ₹180, so the buyer pays ₹1,180. Businesses can claim credit for tax paid on inputs and pay tax only on value addition. Exports are zero rated, which means the exporter can export without tax under LUT and claim ITC refund, or export with payment of IGST and claim that tax back.
GST was introduced through the Constitution (101st Amendment) Act, 2016 and launched on 1 July 2017. The GST Council is a constitutional body under Article 279A of the Constitution. The Council is chaired by the Union Finance Minister and includes the Union Minister of State for Revenue or Finance and the finance ministers of all states. It recommends rates, exemptions, thresholds and the place of supply rules. Decisions need a three fourths majority, with the Centre holding one third weight and the states together holding two thirds.
After the GST reforms of 2026, approved by the Council in September 2026, the rate structure was simplified mainly into 5 percent and 18 percent slabs, with 0 percent for essentials and 40 percent for luxury and sin goods. Special rates of 3 percent on gold and 0.25 percent on rough diamonds continue. This background explains why inverted duty cases arise when inputs fall in the higher slab and outputs fall in the lower slab.
Key Takeaways
- CBIC Notification No. 03/2026 dated 26 October 2026 fixed 1 November 2026 as the start date for Sections 153 to 155 of the Finance Act, 2026.
- The amended Section 54(6) of the CGST Act, 2017 extends 90 percent provisional refund to eligible inverted duty structure claims.
- The amended Section 54(14) removes the ₹1,000 minimum refund floor only for tax paid on goods exported out of India.
- An inverted duty structure arises when the GST rate on inputs is higher than the rate on outputs, with refunds governed by Section 54(3) and Rule 89(5).
- The GST Council is a constitutional body under Article 279A, and GST was launched in India on 1 July 2017.
