As European leaders grapple with how to preserve their monetary union, Greece is rapidly running out of money.

Nikos Lekkas, a government official, said banks had hindered his efforts to collect back taxes.

Government coffers could be empty as soon as July, shortly after this month’s pivotal elections. In the worst case, Athens might have to temporarily stop paying for salaries and pensions, along with imports of fuel, food and pharmaceuticals.

Officials, scrambling for solutions, have considered dipping into funds that are supposed to be for Greece’s troubled banks. Some are even suggesting doling out i.o.u.’s.

Greek leaders said that despite their latest bailout of 130 billion euros, or $161.7 billion, they face a shortfall of 1.7 billion euros because tax revenue and other sources of potential income are drying up. A wrenching recession and harsh budget cuts have left businesses and individuals with less and less to give for taxes — and growing incentive to avoid paying what they owe.

The budget gap is widening as the so-called troika of lenders — the International Monetary Fund, the European Central Bank and the European Commission — withholds 1 billion euros in bailout money earmarked for government financing while it waits to see whether new leaders elected June 17 will honor Greece’s commitments.

Even if the troika delivers that money, Greece will struggle to cover its obligations. It underscored a harsh reality that is playing out in other troubled euro zone economies. Prolonged austerity is making it harder, not easier, for governments like Greece to become self-reliant again.