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The U.S. solar industry is at a pivotal moment in its lifetime, especially for business owners. At the end of last year, the 30% federal tax credit for residential systems was eliminated. After years of relatively stable policy support, the federal solar Investment Tax Credit (ITC) is changing rapidly, and the window to claim the full federal incentive for commercial businesses is shrinking. If you’re planning a commercial solar installation, timing is everything! Here is what you need to know if solar is a decision you’ve been considering for your business.

The federal tax credit, which was formally known as the investment tax credit (ITC), has been one of the most significant incentives for solar energy development across the country. It formally allowed both commercial and residential projects to deduct a percentage of the qualifying installation costs from their federal tax bills. While this incentive disappeared for residential systems at the end of 2025, it is still currently available for commercial projects. But the timeline to take advantage of this credit is getting shorter.

Here are the key dates you need to keep an eye on as a business owner:

Commercial systems need to begin construction before or by July 4th, 2026, to qualify for the 30% federal ITC. This marks the end of the window where construction can lock in the eligibility of a project.

If your project does not reach the fourth of July deadline this year, there is still a final chance to capture the 30% credit, but the timeline to do so is much tighter.

Projects that start construction after 7/4/26 must be fully installed and have permission to operate (PTO) by the end of 2027 to qualify for the ITC at all. If a project doesn’t meet either of these conditions, such as missing both the mid-2026 begin construction deadline and the 2027 placed-in-service deadline, then under current law, it will not qualify for the ITC after 2027.

For business owners and other commercial spaces, timing your project to take advantage of this incentive is crucial. The federal tax credit has historically made solar projects more affordable and financially compelling. However, with the new law tightening eligibility windows, businesses that want to capture the full 30% federal ITC must act fast.

If you’re considering going solar for your business, or are already in development of doing so, now is the time to solidify your plans and ensure your project meets these deadlines. Consulting with solar developers, tax advisors, and legal teams early can be the difference between capturing the credit and missing out entirely.

Sources: One Big Beautiful Bill: The New Rules for Commercial Solar Incentives

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