Excessive Deficit procedure
States which have joined the Euro may only run a public budget deficit of up to 3% of Gross National Product (GNP) according to the Stability and Growth Pact.
The EU Commission starts an excessive deficit procedure when there is a risk that a country will exceed the 3% limit. The procedure can lead to a fine if upheld in the Council of Ministers, but this has never happened so far.
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See also Convergence criteria and European Monetary System.