Parliament asks the Commission to develop the transaction tax plan in time for the EU to present a common position to present to the G20 in June. The Commission is also asked to assess how such a tax could help stabilise financial markets and prevent a similar crisis by targeting "undesirable" transactions, which should be specifically identified by the Commission, says the resolution.

The Commission and Council are urged to look at how the tax could be used to finance development co-operation and help developing countries to combat climate change, as well as at how the tax could contribute to the EU budget.

While preferring a global approach through the G20, MEPs believe that the pros and cons of introducing a purely EU-wide tax should be weighed up, even if the EU's main partners do not introduce such a tax.

Any such tax must not harm the banking system's ability to perform its vital role of financing real economy investments, and must not encourage the migration of capital, the resolution stresses.  Negative repercussions on small businesses and individual investors must be avoided, it adds.

Replying for the Commission, Algirdas Semeta said it believed that the issue is best tackled at global level, since this is the only way to prevent capital flight. He also said that the Commission was considering regulating the financial industry by means of such a tax and that without a well-defined distributive mechanism, the revenue generated could well end up in those few countries with large financial centres.