Self-employed Greeks are "paying over 100% of their reported income flows to debt servicing on consumer debts."

Upper-middle-class professionals in Greece dodge taxes.
A blurb from a University of Chicago paper from 2012 says "the self-employed are paying over 100% of their reported income flows to debt servicing on consumer loans." Analysts have suggested that this means they are underreporting their incomes.
In 2009, €28 billion of tax was evaded by self-employed people alone.
Source: Business Insider