On May 5, 2016, the IRS released Notice 2016-31, which provides additional guidance on the “start of construction” requirements for the production tax credit (PTC) and investment tax credit (ITC) in lieu of the PTC. Notice 2016-31 does not provide guidance with respect to the ITC for solar facilities. On May 18, 2016, the IRS revised Notice 2016-31. As discussed in the alert linked below, Notice 2016-31 provides additional guidance on satisfying the continuity requirement for beginning construction, satisfying the physical work test, and applying the five percent safe harbor to retrofitted facilities.