A financial trading tax (FTT) planned by a group of euro zone nations could leave major banks, its main target, relatively unscathed while less nimble smaller trading houses, pension funds and asset managers bear the brunt.

Germany, France and nine other countries are pushing ahead with the tax on trades in stocks, bonds and derivatives, keen to show voters they can claw back some of the taxpayers' money used to bail out banks during the 2007-2009 financial crisis.