Treaty protection for aircraft lease rentals depends on domestic incorporation, lease characterisation, PE analysis, and Article 8 allocation.

Treaty modification under the Multilateral Instrument does not operate domestically without separate incorporation under section 90(1), so the Principal Purpose Test could not be used to deny India-Ireland treaty benefits. The aircraft arrangements were treated as operating leases because title, end-of-term acquisition, and purchase rights remained with the lessor, while finance-lease features were absent. No fixed place permanent establishment arose in India because the aircraft were not at the foreign lessor's disposal and its leasing business was conducted outside India. Article 8 was read to allocate taxing rights over aircraft rental income to the residence State, leaving the income outside Indian tax.

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Issues: (i) Whether Articles 6 and 7 of the Multilateral Instrument could be invoked to deny benefits under the India-Ireland Double Taxation Avoidance Agreement in the absence of a separate notification under section 90(1) of the Income-tax Act, 1961; (ii) whether the aircraft lease arrangements were operating leases or finance leases; (iii) whether the leased aircraft constituted a fixed place permanent establishment in India; and (iv) whether Article 8 of the India-Ireland Double Taxation Avoidance Agreement nevertheless protected the lease rental income from taxation in India.

Issue (i): Whether Articles 6 and 7 of the Multilateral Instrument could be invoked to deny benefits under the India-Ireland Double Taxation Avoidance Agreement in the absence of a separate notification under section 90(1) of the Income-tax Act, 1961.

Analysis: The binding rule applied was that treaty modifications affecting domestic tax rights do not operate automatically merely because the multilateral instrument has been notified. A separate notification under section 90(1) is required for the relevant treaty modification to have domestic effect. The synthesised text is only an explanatory aid and not a source of enforceable law. On the facts, the Principal Purpose Test could not be applied to deny treaty benefits without such domestic incorporation.

Conclusion: The issue is answered in favour of the assessee.

Issue (ii): Whether the aircraft lease arrangements were operating leases or finance leases.

Analysis: The lease terms showed that ownership remained with the lessor, the lessee had no purchase option or residual acquisition mechanism, the aircraft had to be redelivered on expiry, and the lessor retained repossession and title-protection rights. The regulatory and judicial indicators relied upon also supported the ordinary commercial character of an operating lease. The features typically essential to a finance lease, especially transfer of ownership at the end of the term, were absent.

Conclusion: The issue is answered in favour of the assessee.

Issue (iii): Whether the leased aircraft constituted a fixed place permanent establishment in India.

Analysis: A fixed place permanent establishment requires a place of business that is fixed and at the disposal of the foreign enterprise, through which its business is carried on. The aircraft were under the operational control of the Indian lessee, while the assessee's leasing business was conducted from outside India. Protective rights such as inspection and repossession did not amount to disposal or business presence in India. The disposal test was not satisfied.

Conclusion: The issue is answered in favour of the assessee.

Issue (iv): Whether Article 8 of the India-Ireland Double Taxation Avoidance Agreement protected the lease rental income from taxation in India.

Analysis: Article 8 expressly covers profits from the operation or rental of aircraft in international traffic and allocates exclusive taxing rights to the State of residence. The treaty text was read according to its plain meaning, and the aircraft formed part of an airline fleet used on international traffic as contemplated by the agreement. Even otherwise, the special allocation rule under Article 8 prevails over the general business profits provision.

Conclusion: The issue is answered in favour of the assessee.

Final Conclusion: The treaty denial, finance-lease characterisation, and permanent-establishment findings were unsustainable, and the rental income was held not taxable in India on the basis of the applicable treaty framework.

Ratio Decidendi: A treaty modification altering domestic tax consequences requires specific incorporation under section 90(1), an aircraft lease remains an operating lease where title and end-of-term ownership do not pass to the lessee, and a fixed place permanent establishment is not established without disposal and business carriage through the asset in India.

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