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Gwen Brown
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Gwen Brown

Gwen Brown is a Content Marketing Analyst at Aurora Solar. Previously, she was a Senior Research Associate at the Environmental Law Institute. She graduated Phi Beta Kappa from Gettysburg College.

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Understanding the “Commence Construction” Clause of the Solar ITC: What You Need to Know

Gwen BrownGwen Brown

Whether you’ve been working in the U.S. solar industry for a decade or a week, chances are you’re familiar with the Investment Tax Credit (ITC), one of the most important incentives for solar customers. This federal policy, which allows owners to deduct 30% of the cost of a solar installation from their taxes, has been a cornerstone in the growth of the solar industry.

Stakeholders breathed a sigh of relief in December 2015 when the solar ITC–previously set to expire at the end of 2016–was extended for an additional five years. But starting in 2020, the value of the tax credit will drop down to 26% of the system cost as part of a multi-year phase-out. If construction on a solar project has not started before that point, the lower tax credit will apply. But what qualifies as starting construction? The IRS recently released guidance which answers this question.

Solar contractors will need to have a firm grasp on this “commence construction” policy to know whether a project that may extend into 2020 will qualify for the 30% ITC. This will allow you to give customers an accurate understanding of the true cost of their system after ITC credits. In today’s article, we explain what you need to know about the “commence construction” guidance released by the IRS on June 22, 2018.

[Note: This blog post is provided for informational purposes only and does not constitute legal advice. Consult an attorney for guidance on your particular situation.]

The Solar ITC will be phased out from 2020 - 2022.The solar ITC will begin to be phased out starting in 2020. The phase-out will end in 2022 when the ITC drops to zero for residential projects and a permanent 10% for commercial projects. 

Understanding the “Commence Construction” Clause

According to the IRS, there are two ways to establish that construction on a solar project has started for the purposes of claiming the solar ITC:

  1. passing the “Physical Work Test” by starting “physical work of a significant nature,” or
  2. passing the “Five Percent Safe Harbor test” by “spending five percent or more of the total cost of the facility in the year that construction begins.”

In either case, the system owner will need to show continuous progress on the project after that point in order (the “Continuity Requirement”) in order to qualify.

Let’s delve into each of these cases a little more closely:

The Physical Work Test

The physical work test establishes that construction has commenced on a project when “physical work of a significant nature” has begun on the project. The IRS states that whether the work is considered “significant” is based on the nature of the work, rather than the amount or cost of that work. In the case of a solar installation, one example of qualifying work that the IRS provides in their guidance document is the installation of racking to affix solar panels to a site. 

System owners can qualify for the solar ITC by starting significant physical construction before it expiresA PV system owner can establish the start of a project for the purpose of claiming the solar ITC by starting physical work of a significant nature (what the IRS calls "the Physical Work Test"). 

The qualifying work may be undertaken by the taxpayer (i.e., the PV system owner) or a contractor working under binding written contract entered into prior to the start of work (i.e., your solar installation company). Technically, this work may take place on-site or off-site, however, in the case of a residential or commercial solar PV installation off-site work is less likely to apply. Off-site work does not include work “to produce components of energy property that are either in existing inventory or are normally held in inventory by a vendor”–as would typically be the case for solar equipment.

“Preliminary activities” do not qualify for the Physical Work Test. Some examples of preliminary activities include planning or designing the project, securing financing, researching, obtaining permits and licenses, clearing a site, or removing existing solar panels or other components that will no longer be part of the energy property.

Again, once construction has commenced on the project for the purposes of qualifying for the solar ITC, continuous work must be done on the project until it is completed.

The Five Percent Safe Harbor Test

An alternative way that a solar system owner may establish that construction has started on a project for the sake of qualifying for the 30% ITC prior to the end of 2019, is by having paid or incurred five percent or more of the total cost of the energy property. In the case of a solar PV installation, this refers to the cost of the PV system. This does not include the cost of land or any property not integral to the energy system. 

System owners can qualify for the solar ITC by incurring five percent or more of the cost of the project before it expiresA PV system owner can also establish the start of a project for the purpose of claiming the solar ITC by incurring five percent or more of the cost of the project (what the IRS calls the "Five Percent Safe Harbor Test").

There is an important caveat to this method of establishing the start of the project. If the project cost exceeds what was anticipated, so that the amount the system owner paid to satisfy the five percent Safe Harbor later falls short of five percent of the total cost, they will be found not to have met the requirement.

As with the physical work test, the system owner must also show continuous progress after this point in order to continue to qualify for the Safe Harbor. The IRS notes that this could include “(a) paying or incurring additional amounts included in the total cost of the energy property; (b) entering into binding written contracts for the manufacture, construction, or production of components of property or for future work to construct the energy property; (c) obtaining necessary permits; and (d) performing physical work of a significant nature.”

Combination of Methods

If a PV system owner meets both methods of establishing the commencement of construction, whichever method occurs first will be used as the date in which construction began for the purposes of the solar ITC.


This guidance from the IRS provides solar customers, contractors, project developers and others the clarity they need to determine whether and at what level the solar ITC will apply to a given project. With this information, your solar company can better advise prospective customers on how this key federal incentive will reduce the cost of their project.

More broadly, having this additional detail from the IRS on the Investment Tax Credit is very beneficial to the solar industry because it provides much needed certainty for companies, especially tax equity partners, when considering longer-term project schedules.

Commenting on the measure, SEIA President and CEO Abby Hopper remarked that “In the absence of this commence construction guidance, tax equity partners were growing cautious about project risk.” Deeming the IRS guidance a victory for the industry, she noted that “The IRS has taken an important step forward with this guidance and provided certainty that will help solar project sponsors finance and build more solar.”

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Gwen Brown
Author

Gwen Brown

Gwen Brown is a Content Marketing Analyst at Aurora Solar. Previously, she was a Senior Research Associate at the Environmental Law Institute. She graduated Phi Beta Kappa from Gettysburg College.

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