EU bank bailout roulette awaits Monte dei Paschi investors

* Investor treatment in bank bailouts varies across Europe

* EU bail-in framework does not take effect until 2018

* Countries will still have large degree of discretion

* Monte dei Paschi investors wait to see how they will fare

By Laura Noonan

LONDON, Sept 29 (Reuters) - Investors awaiting the finer points of Monte dei Paschi's restructuring plan could soon find themselves wishing their bank had run aground at another time and place in the eurozone financial crisis.

After approving more than 5 trillion euros of state aid to its financial system over the past five years, the European Union has switched the burden of bank bailouts away from taxpayers and onto shareholders, bondholders and big depositors.

But a consistent approach and certainty over who pays when a bank gets into trouble is still lacking, deterring much-needed investment into the region and its lenders and ensuring a steady stream of lawsuits when losses are imposed.

"We are trending in the direction of a proper priority of claim, a proper following of the hierarchy of the capital structure," said Aaron Elliott, a London-based credit analyst at Citi. "But we are certainly not there yet."

"It's very difficult for investors to get involved," he added, pointing to a reluctance to buy bank debt in some countries.

European rules designed to ensure a harmonised approach to bank bail-ins, forged over the summer, do not take effect until 2018, leaving bank investors in heavily indebted countries in limbo and weighing on those states' own cost of borrowing.

"The reality is, these individual countries can't wait for 2018 to bail in bondholders, they just can't afford to do that," said Elliott.

In response to public outrage over taxpayer-funded bailouts and to reassure small depositors their funds were safe, the European Commission, which sets conditions banks must fulfil to qualify for state aid, in July updated its framework for bank bailouts for the seventh time in the crisis.

But the EU Competition Authority's powers as defacto guardian of bailout consistency are limited - the framework lays out broad guidelines for imposing losses on shareholders, bondholders and large depositors, but exceptions can be made if the measures would do more harm than good.

"State aid control does not enable the Commission to 'harmonise' measures that member states intend to implement, but merely to set minimum standards for them to be compatible with the internal market," the spokesman for the EC's competition division said. "Inconsistencies ... are thus due to the choices of member states."