Most favoured nation clause interpretation guides treaty effect, subject to domestic notification requirements for implementation.

The Most Favoured Nation (MFN) clause in tax treaties must be interpreted under Article 31 VCLT principles as reflecting customary international law, with subsequent agreements and state practice serving as authentic means of interpretation. Domestic implementation procedures materially affect treaty operation: comparative practices of other states cannot substitute for India's requirement of formal domestic steps, including issuance of a notification after a treaty trigger event, to assimilate treaty amendments into national law.

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