Treaty implementation procedures determine when DTAA modifications bind taxpayers, requiring domestic notification for enforceability.

In India, DTAA modifications take effect only upon formal domestic notification, preventing automatic retroactive application of third country treaty changes and reflecting a dualist approach requiring assimilation of treaty amendments into domestic law before they bind taxpayers; by contrast, the Netherlands, France, and Switzerland rely on differing domestic mechanisms-executive decrees, parliamentary ratification, or referenda and implementing orders-that may permit retroactive application and integrate treaties into domestic enforceable law.

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