Amends the Employee Retirement Income Security Act of 1974 to postpone for one month (from July 1, 1980 to August 1, 1980) the date on which the Pension Benefit Guaranty Corporation must pay benefits under terminated multiemployer plans (i.e., prohibits the Corporation from making such payments to multiemployer pension plans which terminate before August 1, 1980, except in specified cases for which the Corporation is authorized to make such payments).