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ONE PROBLEM, IN DETAIL

SOLAR: THE OBBBA CLIFF

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The One Big Beautiful Bill Act (signed July 4, 2025) rewrote solar's economics twice over. Residential: the Section 25D homeowner credit expired December 31, 2025; residential installers lost the federal incentive entirely. Commercial: Section 48E's 30 percent ITC now has two paths.

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This page covers one problem. The other places this trade loses margin are on the solar operating system page.

BY JOSH LUEBKERPublished 2026-08-06Updated 2026-11-02
WHAT BREAKS

WHERE THE MONEY GOES.

The OBBBA cliff (the deadline that just passed, and the one still coming)

The One Big Beautiful Bill Act (signed July 4, 2025) rewrote solar's economics twice over. Residential: the Section 25D homeowner credit expired December 31, 2025; residential installers lost the federal incentive entirely. Commercial: Section 48E's 30 percent ITC now has two paths. (1) Projects that BEGAN construction by July 4, 2026 keep the credit, with a continuity window of roughly four years (into 2030). (2) Projects that missed the start deadline must be fully PLACED IN SERVICE by December 31, 2027 to claim anything. The start deadline passed a month before this research. So the 2026-2027 book is split in two: safe-harbored backlog working to meet the continuity rules, and post-deadline projects that must be in service within eighteen months.

WHAT THE NUMBERS SAY

THE COST, SOURCED.

Sourced anchors

25D expiration 12/31/2025; 48E July 4, 2026 begin-construction deadline with four-year continuity; 12/31/2027 placed-in-service cliff for late starts; base 6 percent rate rising to 30 percent with prevailing-wage/apprenticeship compliance or sub-1MW size. (Tax Adviser, Spencer Fane, commercial-solar market guides, 2026.)

WHAT THIS TRADE SHOULD EARN

THE NUMBER TO MEASURE IT AGAINST.

Solar contractors have about 7% net profit at $1M to $5M, rising to roughly 9% at $5M to $10M. The CFOS net profit target is 10.5% before taxes at $1M to $5M, the trade's average plus 3.5 points, never below 10%. You find a problem like this in the distance between those two figures. One bad job won't tell you.

Gross margin over the same bands is 22% to 23%,against CFOS targets of 24.5% and 25.5%.

Full solar benchmark bands by revenue

WHAT CONTROLS IT

THE SYSTEM THAT FIXES THIS.

Cash Flow Cycle System

Billing, documentation and collections, which is where the slow days come from.

How the Cash Flow Cycle System works

COMMON QUESTIONS

FREQUENTLY ASKED.

Solar contractors at $1M to $5M net about 7 percent on the SPM 48-trade benchmark dataset, rising to 13 percent by $25M to $50M; the CFOS net profit target is 10.5 percent before taxes at $1M to $5M, the trade average plus 3.5 points. In 2026-2027 you can't separate margin from policy. It depends on which clock each project is on and whether the credit documentation holds. Every net profit figure here is gross margin minus overhead, stated before taxes, the same basis CFMA reports net income on.

See the full benchmarks for every revenue band on Run On CFOS.

The OBBBA, signed July 4, 2025, ended the residential 25D credit on December 31, 2025. It put commercial 48E on a deadline. Projects that begin construction by July 4, 2026 keep the 30 percent credit with a four-year completion window. Later starts must be fully in service by December 31, 2027 to claim anything. Check the current federal and state posture before you quote. The safe-harbor rules themselves have been litigated mid-year.

Through the begin-construction tests. That means physical work of a significant nature (on-site, or off-site under binding contract) or, where it applies, the 5 percent cost safe harbor. You also need continuity documentation through completion. A court vacated the IRS notice that limited the 5 percent path in mid-2026, and an appeal is expected. So the physical-work record is the evidence that lasts. Keep it to audit standard. It's worth 30 percent of the project.

Three tiers, and which one you are in depends on how much of the work you want off your desk. On Core we build your plan every month and your team does the work: job costing built against the way you estimate, a 13 week cash forecast, monthly WIP, and a monthly meeting that ends in decisions, while your bookkeeper keeps doing the books. On Strategic we build the plan, track it and adjust it every month: our team does the bookkeeping and the bank reconciliations, and the job costing and WIP software is set up and managed for you, on your own online software or ours. On Platinum we manage the money side for you every week: our team handles your bills and receivables the way an in-house controller would, and you approve every payment. We don't do payroll.

Sixty days. We migrate your books back to the start of your last taxable year and build your job costing structure from scratch, and on Strategic and Platinum we set up the job costing and WIP software too. You're fully up and working in two months. The onboarding fee is one time, the same for every tier, and set by your revenue band.
WHAT THIS TIES INTO
Josh Luebker, SPM The Construction CFO
Josh Luebker
FRACTIONAL CFO · SPM THE CONSTRUCTION CFO

Josh Luebker is a master electrician turned construction CFO, president of SPM The Construction CFO and author of CONTROL: C.F.O.S. Construction Financial Operating System.

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