Tax information exchange between states is now an issue at the heart of making tax not just possible, but democracy possible too. The UK is at the centre of this debate - as its potential tax deal with Switzerland puts the agenda back by years and as such is deeply offensive to democrats and all who believe in the rule of law and the right to tax everywhere.

There's a new academic paper on this available to download free for enthusiasts, here. Written by Itai Grinberg of Georgetown University Law Center the abstract says:

The international tax system is in the midst of a novel contest between information reporting and anonymous withholding models for ensuring that states have the ability to tax offshore accounts. At stake is the extent of many countries' capacity to tax investment income of individuals and profits of closely held businesses through an income tax in an increasingly financially integrated world. Four incongruent initiatives of the European Union, the OECD, Switzerland, and the United States together represent an emerging international regime in which financial institutions act to facilitate countries' ability to tax their residents' offshore accounts. The growing consensus that financial institutions should act as "tax intermediaries" cross-border represents a remarkable shift in international norms that has yet to be recognized in the literature. What remains is a contest as to how financial institutions should serve as tax intermediaries cross-border, and for which countries.
Different outcomes in this contest portend starkly different futures for the extent of cross-border tax administrative assistance available to most countries. The eventual triumph of an information reporting model over an anonymous withholding model is key to (1) allowing for the taxation of principal, (2) ensuring that most countries are included in the benefit of financial institutions serving as tax intermediaries cross-border, and (3) encouraging taxpayer engagement with the polity and supporting sovereign policy flexibility, especially in emerging and developing economies. The article closes with proposals to help reconcile the emerging automatic information exchange approaches and produce an effective multilateral system.

This is welcome, and is going to reward study.