Kill-Switches in the U.S. Model Tax Treaty

The new U.S. Model income tax treaty contains an unusual addition: mechanisms for the parties to unilaterally override the negotiated treaty rates in specified circumstances. Previewed last year in proposed form—a first for the Treasury—these new mechanisms work as kill-switches, partially terminating the treaty as to one or both treaty partners. The idea is to forestall a more problematic outcome, such as an enduring breach of one of the parties’ expectations, or the opposite, a complete termination of all the treaty terms in the face of such a breach. Yet embedding a kill-switch in a treaty creates distinct legal, procedural, and political pressures in the tax-treaty relationship that implicate treaty negotiation, ratification, interpretation, and dispute resolution. Kill-switches also communicate a defensive tenor in the tax treaty relationships among many countries. This article analyzes the new kill-switch provisions and concludes that their introduction in the U.S. Model reflects the steady deterioration of tax treaties from essentially diplomatic documents premised on the good faith of the parties to detailed contracts drafted in anticipation of the opposite.