Christine Lagarde: Greeks can help themselves out of the crisis by 'paying their tax' Greece's central bank estimates that personal income tax evasion in Greece equates to between 2.5pc and 3.8pc of GDP, while its shadow economy - made up of the trade, goods and services, both legal and illegal where taxes are not paid - grew from 24.3pc of GDP in 2008 to 25.4pc in 2010. The country will hold a fresh round of elections next month, as it attempts to form a government for the second time. A recent poll conducted by VRPC showed anti-bail-out party Syriza in the lead with 28.5pc of the vote. New Democracy, which supports the bail-out, is in second place with 26pc. Many fear that if Greece chooses to vote in an anti-austerity government on June 17, it will renege on the terms of its multi-billion-euro bail-out deal which has kept the country afloat, and force Greece out of the euro. Syriza leader Alexis Tsipras initially branded Greece's bail-out deal "barbarous," though he has since softened his stance, and insisted that his calls to renegotiate the Greece's aid package was not an attempt to "blackmail" the continent. "I'm not trying to blackmail anyone but to convince the German people that everything happening [in Greece] is in their own interest," he said this week.