Greek taxmen may be dodging taxes, too

More than half of tax collectors are over 50 years old, underpaid, in some cases even lacking an own desk or computer, the 72-page report says.

Internal checks also found evidence that some 130 tax inspectors have bank accounts abroad, a sign of possible tax evasion.

Reforms undertaken by the Greek government are "muddled" and "slow", leaving the tax collecting system still prone to "political tampering or corruption."

Last year, Greece only collected €1.1 billion in overdue taxes, a little over half of its declared target of €2bn. The state still has to claw back some €55 billion, amounting to 30 percent of the country's national output, the report says. But many of the companies owing taxes have gone bankrupt.

The international experts doubt that Greece will manage to meet its tax collection target for 2013 without immediately hiring some 200 new inspectors and focusing on the 1,500 biggest debts.

In reaction to the leaked report, Greek finance minister Yannis Stournaras said that "a lot has happened" since January when the paper was drafted.

"We are carefully studying everything, and, taking the comments into account, we will proceed," he told reporters in Athens on Thursday.

The Greek finance ministry put out a statement saying that 1,680 out of the 2,000 Greeks with Swiss bank accounts on the informal list drafted by the IMF chief Christine Lagarde had been identified and their tax declarations are being checked.

The troika of officials from the EU commission, European Central Bank and the International Monetary Fund is returning to Athens on Sunday to begin its review needed for the next bailout tranche to be disbursed. Eurozone finance ministers meeting in Brussels on Monday are also likely to discuss the Greek situation.

Tax revenues are an important factor in the troika evaluation, with latest budget data showing a €300 million shortfall in January. February also ended with a gap, but Prime Minister Antonis Samaras told lawmakers earlier this week the revenue intake gap will be covered by spending cuts.

The news of further cuts comes as the population is already under intense strain. A quarter of the workforce is unemployed and the country is in its sixth year of recession.