ATHENS, Greece — An exit from the euro would see Greeks lose more than half their annual income and prompt a dramatic rise in unemployment and inflation, a report from the country’s largest bank warned Tuesday.

The National Bank of Greece study was published as Greece heads to new general elections on June 17, amid Europe-wide concern of broader financial turmoil if Greece’s place in the single currency is threatened by a victory for an anti-austerity party.

“An exit from the euro would cause a significant drop in the living standards of Greek citizens — with a reduction of at least 55 percent in per capita income,” the authors of the report wrote.

“This would affect those on a lower income the most, with a significant devaluation of the new currency, by 65 percent, and financial contraction of 22 percent on top of the (GDP) reduction of 14 percent that occurred between 2009 and 2011,” they wrote.

Amid global concern over the euro, a senior U.S. Treasury official was in Athens on Tuesday to start a round of European consultations. Lael Brainard, a Treasury Undersecretary for International Affairs, met top Greek finance officials and is due to go to Frankfurt, Germany, and Madrid, Spain, for more talks.

Debt-crippled Greece has been kept afloat by huge international rescue loans, granted on the condition of harsh cutbacks and reforms that slashed living standards that have driven the country into political stalemate.

Political parties were unable to form a coalition government after May 6 elections, triggering another contest between the pro-bailout New Democracy conservatives and left-wing Syriza party that has promised to cancel the terms of the country’s rescue loan agreements.

The bank report also warned that if Greece did exit the euro, unemployment would rise to 34 percent while inflation would hit 30 percent, then higher. Unemployment in Greece currently stands around 22 percent while inflation is 2 percent.

News that New Democracy had taken a slight lead in the weekend opinion polls sent shares on the Athens Stock Exchange up by 6.9 percent Monday and a further 1.9 percent Tuesday.

“New Democracy has regained the lead in several opinion polls, ahead of its main rival, the left-wing Syriza party. Given that the party that comes first in the election gets a 50-seat bonus in the 300-member Parliament, coming first is crucial,” Martin Koehring of the Economist Intelligence Unit said.

He added, “It is likely that a new government will be able to get some concessions on the pace of implementing the agenda.”