Solar Tax Credit Changes in 2026: What Installers Need to Know and How to Adapt

The federal tax law signed on July 4, 2025 (Public Law 119-21, often called the One Big Beautiful Bill Act) reshaped the U.S. solar market. For installers, it changed what you can promise customers, which financing works, and how long certain business models will last. This article summarizes what changed, based on IRS guidance and the statute, and how a solar company can adapt. It is general information, not tax advice; tax questions belong with a qualified professional.

What changed, in one table

IRS Notice 2025-42 also tightened how solar projects establish "beginning of construction," generally relying on physical work of a significant nature and removing the 5 percent safe harbor for most solar projects (with an exception for certain low-output facilities).

What it means for residential sales

The 25D change raised the net cost of a homeowner-owned system by about 30 percent overnight. A homeowner buying with cash or a loan in 2026 doesn't get the federal credit, even if they paid a deposit in 2025 but installation was completed in 2026.

That changes your sales conversation:

• Don't mention the 30 percent credit for homeowner-owned systems except to explain that it ended.
• Lead with bill savings, backup power and state or utility incentives that actually apply.
• Use conservative assumptions for production, rate increases and export credits.
• Offer third-party ownership where it fits, explaining that the financier claims business credits and that new solar under those programs faces the 2027 deadline.

Warning: Telling a homeowner they'll "get 30 percent back" on a system installed in 2026 is false under current federal law and can expose your company to consumer complaints and legal action.

What it means for commercial and TPO work

For lease and PPA providers and commercial customers, the key dates are July 4, 2026 and December 31, 2027. Because the July 4, 2026 begin-construction date has passed, new solar facilities starting construction now must be placed in service by the end of 2027 to claim 48E or 45Y. That compresses timelines. Schedule slips, utility delays and equipment shortages can cost a customer the credit, so:

• Build realistic schedules with buffers for permits, interconnection and equipment.
• Put deadline risk in writing; customers should rely on their own tax advisors.
• Expect financiers to tighten program rules, equipment requirements and documentation as the deadline approaches.
• Watch foreign entity sourcing documentation closely.

Storage is the bright spot

Under current law, business-owned energy storage keeps a longer credit runway than solar. Combined with outages, time-of-use rates and net billing structures that reward self-consumption, storage demand is a strong growth area. Homeowner-owned batteries, however, lost the 25D credit too, so residential battery sales still need to stand on backup value and bill savings.

Business models that adapt well

Worked example: the same homeowner, before and after

A homeowner considers an 8 kW system priced at $21,000 with expected first-year bill savings of $1,900.

The 2026 system is the same equipment with the same savings; only the payback changed. In high-rate territories, or with a battery that captures time-of-use value, the numbers can still work. In low-rate territories with weak export credits, the honest answer may be "not right now," and saying so builds the trust that wins referrals and service work.

Your 2026–2027 action checklist

• ☐ Remove any homeowner tax credit claims from websites, ads and proposals
• ☐ Add a clear tax disclosure to every proposal
• ☐ Rebuild your savings model without 25D
• ☐ Map active state and utility incentives (DSIRE is a starting point; confirm on official sites)
• ☐ Review financier programs and their deadline rules
• ☐ Document equipment sourcing for foreign entity compliance where partners require it
• ☐ Launch or grow service, R&R and battery offerings
• ☐ Write a 2028 plan that doesn't depend on new-solar business credits

A disclosure you can adapt

"[Company] does not provide tax advice. Under current federal law, the Residential Clean Energy Credit does not apply to systems installed after December 31, 2025. Lease and PPA providers may claim business tax credits subject to federal deadlines. Please consult a qualified tax professional about your situation."

Planning for 2028

Unless the law changes, new solar facilities beginning construction after July 4, 2026 lose federal business credits if placed in service after 2027. Companies that will thrive in 2028 are building recurring revenue now: maintenance plans, monitoring, service of orphaned systems, battery retrofits and roofer partnerships. Keep fixed costs flexible, avoid long leases sized to 2027 volume, and track state programs that may expand.

How to talk about the changes with customers

Customers hear conflicting claims from different salespeople. Keep your explanation short and verifiable:

"The federal tax credit for homeowners who buy their own solar ended for systems installed after 2025. I'll show you the numbers without it. If a lease or PPA makes sense for you, the company that owns the system claims business credits, and those programs have their own deadlines. For anything about your taxes, please check with your tax professional. Here's the IRS page if you'd like to read it yourself."

Linking to official IRS pages settles disputes quickly and positions your company as the one telling the truth.

Questions installers are asking

• Can a customer who paid a deposit in 2025 still claim 25D? According to the IRS, the expenditure is treated as made when installation is completed, so a system completed in 2026 doesn't qualify even if it was paid for earlier.
• Should we stop selling residential solar? Not necessarily. Run honest numbers by utility territory. Some markets still work well for cash sales or with batteries; others may be better served by service, storage and TPO.
• What about our existing customers? They're your most valuable asset. Offer monitoring checks, maintenance plans, battery retrofits and R&R services.

Your next step

Pull up your current proposal template and website. Remove any outdated credit language, add a clear disclosure, and rerun savings for three recent customers without the federal credit. The results will show which of your markets still work for cash sales and where to lean on storage, service and TPO.

The full guide, Starting a Solar Installation Business, covers the 2025 changes, licensing, NABCEP, codes, interconnection, business models, pricing, ethical sales, installation safety, service operations, marketing and a 90-day launch plan, for $0.99.