WASHINGTON, Aug 31 (Reuters) - The coronavirus pandemic will cause the main U.S. Social Security trust fund reserves to be depleted in 2033, a year sooner than an estimate made a year ago, as a steep drop in employment shrank revenues, the U.S. Treasury said on Tuesday. The Treasury said the Old Age and Survivors Trust Fund would be able to pay 76% of scheduled benefits after 2033 from continuing payroll tax revenues. The Medicare Hospital Insurance Fund reserves are expected to be depleted in 2026, the same as last year’s estimate, Treasury said. (Reporting by David Lawder Editing by Chris Reese) Our Standards: The Thomson Reuters Trust Principles.