An employer who sponsors a pension or welfare benefit plan generally must file Form 5500 on the last day of the seventh month following the end of the plan year.  For calendar-year plans that means the due date is usually July 31st.  In 2011, July 31st falls on a Sunday, so the deadline is moved to the next business day which is Monday, August 1st. 

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If you think you will not be able to file your plan’s return on time, you can request an extension of up to two-and-a-half months – so the extended due date for the return for your calendar year plan would be October 15th.   Form 5558 must be prepared and submitted on paper to request an extension.  Your plan administrator can prepare this extension request for you.  Form 5558 must be filed on or before the original due date of Form 5500.  [/readMoreContent]