Quote from tomdavis:
Ireland, Poland and the Czech Republic have all said at one time or another that they would vote against the FTT unless the UK was willing to participate. But Ireland received a lot of help from the EU restructuring its debt, so it may be difficult for them to say no. Poland and the Check Republic have very little to lose so they could change their minds for any reason. Even Bulgaria has come out against the tax, but I'm not sure what these smaller countries will do when faced with a vote that doesn't really affect them very much (and a "no" vote may earn them enemies in the EU).
My research shows that there are 7 EU countries with highly-developed financial markets. These countries, as a group, will be paying over 90% of the FTT bill and are also the ones that will lose the most jobs and income/capital gains tax revenues if investment funds and financial services companies relocate outside the FTT zone:
The UK
Germany
The Netherlands
France
Sweden
Ireland
Malta
The other EU countries have very little at stake and are unlikely to vote against the FTT at the risk of making enemies of Germany, France, and the EU Commission. (Though I'm hoping a couple of other countries will vote no just so it doesn't look so one-sided.)
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Regarding Eurozone rules: My undertstanding is that all EU or Eurozone taxes on the member states require unanimous consent. However, I don't think there's anything stopping a group of countries from getting together and forming a taxation agreement among themselves. It wouldn't officially qualify as a Eurozone tax, but the individual countries would be free to make any arrangement they want among themselves.
I'm not an expert on Eurozone taxation rules so I'm just giving my best guess based on what I've read. If anyone has a more detailed understanding of EU/Eurozone taxation rules, this would be an advantageous time to share your knowledge with us.