Weekly Regulatory Roundup: Critical Notifications, Circulars & Judicial Rulings Across Tax and Corporate Laws (25–31 May 2026)

The final week of May 2026 witnessed a flurry of regulatory activity across multiple legal and financial domains in India. From landmark Supreme Court rulings on GST applicability to income tax additions, customs duty exemptions, and governance reforms in cooperative banks, regulators and courts issued several consequential pronouncements. This roundup compiles all significant developments issued between 25th and 31st May 2026 across Income Tax, GST, Central Excise, Customs, DGFT, SEBI, MCA, IBBI, RBI, and related domains.

A. Income Tax

Scientific Research Notifications Under Section 45(3)(a)(i)

The Central Government issued four separate notifications on 30th May 2026, recognising prominent academic and research institutions for the purpose of 'Scientific Research' under Section 45(3)(a)(i) of the Income-tax Act, read with Rules 32 and 34 of the Income-tax Rules. These notifications fall under Section 45(4)(b) and classify the following institutions under the category of 'University, college or other institution':

  • National Institute of Advanced Studies, Bangalore (Income Tax Notification 69/2026 Dated 30/05/2026)
  • S. Nijalingappa Sugar Institute, Belgaum (Income Tax Notification 68/2026 Dated 30/05/2026)
  • Regional Centre for Biotechnology, Faridabad, Haryana (Income Tax Notification 67/2026 Dated 30/05/2026)
  • Ramakrishna Mission Vidyamandira under the aegis of Ramakrishna Mission, Belur Math, Howrah (Income Tax Notification 66/2026 Dated 30/05/2026)

Any sum paid by an assessee to these notified institutions for the purpose of scientific research is eligible for deduction while computing total income under the Income-tax Act.

Supreme Court: Additions for Unaccounted Sales Cannot Rest on Estimated Production Yields

DCIT vs Mahamaya Steel Industries Ltd — SC Judgement Dated 05/05/2026

In a significant ruling favouring assessees, the Supreme Court held that the Income Tax department is not permitted to make additions to an assessee's income on the ground of alleged unaccounted sales unless it produces concrete and corroborative evidence of sales suppression. The Court categorically ruled that reliance on estimated production yields, industry-wide averages, or speculative variations in electricity and furnace oil consumption does not constitute sufficient basis for such additions. The judgment reinforces the principle that additions founded purely on suspicion or inference, without tangible supporting material, are legally unsustainable.

High Court: Income Tax Demand Outside Approved IBC Resolution Plan Held Unenforceable

HL Buildwell Pvt Ltd vs DCIT — HC P&H Judgement Dated 06/05/2026

The Punjab and Haryana High Court quashed income tax demands and the related appellate orders raised against the assessee, on the ground that such claims had not been incorporated in the resolution plan duly approved under the Insolvency and Bankruptcy Code (IBC). The Court reaffirmed the settled legal position that once a resolution plan is approved, any claims not forming part of that plan are extinguished and cannot be enforced against the corporate debtor.

B. GST

AAAR Haryana: Intermediary Classification Bars Export Benefit

Maithani Enterprises — AAAR Haryana Ruling Dated 07/05/2026

The Appellate Authority for Advance Rulings (AAAR), Haryana, dismissed the appeal and confirmed that the services rendered by the appellant were performed and consumed within India, making the appellant an intermediary as defined under GST law. Consequently, the services do not qualify as 'export of services', are not zero-rated, attract IGST at 18%, and do not entitle the appellant to refund of Input Tax Credit.

AAAR Haryana: Brake Hoses Classified Under HSN 4009 Based on Essential Character

Nichirin Imperial Autoparts India Pvt Ltd — AAAR Haryana Ruling Dated 29/04/2026

Overturning the lower advance ruling, the AAAR held that Brake Hoses derive their essential character from vulcanized rubber and are therefore appropriately classifiable under Heading 4009 of Chapter 40 as 'Tubes, pipes and hoses, of vulcanized rubber other than hard rubber, with or without their fittings'. The applicable GST rate was confirmed at 18%.

AAAR Rajasthan: Biodegradability Assessment Beyond Jurisdiction of Advance Ruling Authorities

Easy Flux Polymers Private Limited — AAAR Rajasthan Ruling Dated 02/04/2026

The AAAR clarified that the advance ruling mechanism does not extend to adjudicating whether a product meets scientific, environmental, or technical standards of biodegradability or compostability — such determination rests with the appropriate environmental authorities. It was reiterated that if the appellant's products are certified as biodegradable, they would qualify for the concessional rate under Entry 319 of Notification 09/2025; otherwise, the standard rate applicable to plastic products under Chapter 39 would govern.

AAR Gujarat: Fresh Isabgol Seeds Exempt from GST as Unprocessed Agricultural Produce

Jigneshkumar Narayandas Patel — AAR Gujarat Ruling Dated 29/05/2026

The Authority for Advance Rulings, Gujarat, held that Psyllium Seeds (Isabgol) supplied in their raw and natural state — procured through APMC auctions directly from farmers and not subjected to any processing such as drying, freezing, or crushing — qualify as 'fresh' Isabgol seeds. Such seeds are exempt from GST under Entry 87 of Notification 10/2025 (Rate).

AAR West Bengal: PP Packing Boxes Classifiable Under HSN 39231090

Jai Hind Plastic — AAR West Bengal Ruling Dated 25/05/2026

The AAR ruled that plastic packaging boxes manufactured by the applicant fall under HSN 39231090 as articles for the conveyance or packing of goods. Lids, caps, and covers supplied along with such boxes are separately classifiable under HSN 39235090. Both categories attract 18% GST.

AAR West Bengal: Laundry Soap Ineligible for Concessional 5% GST Rate

Swadeshi Soap Industries — AAR West Bengal Ruling Dated 25/05/2026

The AAR distinguished laundry soap from toilet soap and held that the two cannot be treated as belonging to the same category for GST purposes. Laundry soap bars weighing below 500 grams were classified under tariff item 34011942 and held taxable at 18% GST under serial number 66 of Schedule II, thereby denying the benefit of the 5% concessional rate.

AAR Tamil Nadu: Rose Water Taxable at 18% GST Despite Religious Marketing

TSR & Co — AAR Tamil Nadu Ruling Dated 05/05/2026

The AAR ruled that the product 'Pooja Panneer' (Rosewater), notwithstanding its exclusive marketing for religious and devotional use, constitutes an aqueous distillate for classification purposes. It is classified under HSN 33019079 and taxable at 18% GST. The devotional branding and packaging of the product in small retail quantities was held insufficient to bring it within any exempted category.

AAR Tamil Nadu: Licence for Temple Hair Collection Attracts 18% GST

Chelliah Rangaraj — AAR Tamil Nadu Ruling Dated 05/05/2026