The 2015 5500 updated the definition of line 4l on the Schedule H to
Line 4l.
You must check “Yes” if any benefits due under the plan were not timely paid or not paid in full.
This would include minimum required distributions to 5% owners who have attained 70½ whether or not retired and/or non-5% owners who have attained 70½ and have retired or separated from service, see section 401(a)(9) of the Code. Include in this amount the total of any outstanding amounts that were not paid when due in previous years that have continued to remain unpaid.
Does anyone know why this was not included in the "Changes to Note" in the 2015 instructions? It does not appear to be optional.