Solar Dealer Fees: How the Low Rate Gets Paid For

What a dealer fee actually is

A dealer fee — also called a lender fee, program fee, platform fee, or finance fee depending on which paperwork you're reading — is a charge the solar loan's lender bills to the installer (the "dealer") in exchange for offering you a rate lower than the lender would otherwise give. The CFPB's Issue Spotlight on Solar Financing (2024-08-07) describes lenders that "frequently bake these fees…into the loan principal but often do not indicate that these fees are a markup."

Legally, the fee is generally treated as "seller's points" — a category of finance charge assessed to the seller rather than the borrower directly, under Regulation Z, 12 C.F.R. § 1026.4. That characterization comes from the CFPB report and from the definition used in pending California Senate Bill 784 (2025–2026 session), which defines a dealer fee for state-law purposes using the same seller's-points cross-reference. We were not able to pull the current regulatory text of § 1026.4 directly — treat the seller's-points label as sourced to the CFPB and the bill text, not as a verbatim quote of the federal rule.

The practical effect for you is simple regardless of the legal label: the fee is charged to the installer on paper, and financed by you in practice.

Why the low advertised rate and the fee are the same lever

Solar lenders publish a menu: a very low rate paired with a high dealer fee, or a higher rate with a low or no dealer fee. Installers pick from that menu — you usually see only the headline rate, not the tradeoff behind it.

The lower the advertised APR, the more the lender needs to charge the installer to make the loan profitable, and the more of that charge ends up rolled into what you owe. The CFPB's sample of solar loans found stated APRs running roughly 1% to 7%, with the true cost — once the dealer fee is amortized into principal — running materially higher than the sticker rate suggests (Issue Spotlight, 2024-08-07). The report documents one lender that advertised a 1.99% APR carrying a 26% dealer fee, and declined to recalculate a real APR for the consumer who asked.

That refusal is the tell. A rate that looks unusually good relative to competitors, on a loan arranged through the installer rather than your own bank, is worth asking about directly — not because a low rate is inherently suspicious, but because "low rate" and "no cost" are not the same claim, and only one of them gets advertised.

Typical ranges, and where the number comes from

The number to anchor on is the CFPB's: dealer fees typically run 10% to 30% of the system's cash price, "sometimes exceeding 50 percent" (Issue Spotlight on Solar Financing, 2024-08-07). That's a federal regulator's own finding, based on its review of solar lending patterns, and it's the figure with the clearest sourcing.

You'll also see 15%–30% and 20%–40% ranges on industry and consumer-advocacy sites. Those aren't regulator data — they're secondary estimates, and some may reflect worst-case outliers rather than the typical deal. Use the CFPB's 10%–30% as your baseline expectation, and treat any claim that "everyone charges the same fee" with skepticism — the fee is a negotiated line item, not a fixed industry rate, and it moves with the rate you're offered. The only way to know your specific number is to see the cash price and the financed price side by side, which is covered below.

The math: how a $30,000 system becomes a $39,000 loan

Here's the CFPB's own worked example (Issue Spotlight, 2024-08-07): a system with a $30,000 cash price, financed with a loan carrying a 30% dealer fee, becomes a $39,000 loan. The $9,000 fee is added on top of the cash price, not netted out of it — the lender pays the installer a discounted amount (roughly the cash price minus the lender's own cut) while originating the loan for the full, inflated figure.

The average U.S. residential solar installation, per the same CFPB report, runs about $25,000 in cash-price terms. The table below applies the CFPB's reported fee range to that average system so you can see the mechanism at different fee levels — this isn't a quote, it's the shape of the math your own contract should be run through.

In 2023, per CFPB-cited market data, 58% of residential solar buyers financed and only 19% paid cash — meaning most buyers are exposed to this mechanic whether they know it or not. That data predates the NEM 3.0 export-rate cuts and the 25D federal credit's expiration on 2025-12-31, so treat it as directional rather than current.

Why the cash price and the loan amount are never the same number

Ask an installer for "the price" and you'll usually get whichever number fits how you said you're paying. Say cash, and you get the cash price. Say you want financing, and the quote that comes back already has the dealer fee baked in — often without a separate line item calling it out.

This is structural, not incidental. The lender's discounted payout to the installer is calculated off the cash price; the loan you sign is calculated by adding the fee back on top of that same cash price. Two different numbers, same system, same roof, same panels. The gap between them is the fee, and it isn't disclosed to you as a fee — it shows up folded into "your monthly payment" and "your total financed amount," which is why the CFPB's report specifically flags the lack of markup disclosure as the core problem, not the existence of the fee itself.

If a salesperson gives you one number described only as "your price," without specifying cash or financed, that's the moment to ask which one it is — and to ask for the other one, in writing.

The 19-month trap — sharper now that the federal credit is gone

Many solar loans are structured as a form of "same-as-cash" note: your payment is calculated as if a lump-sum prepayment — typically around 30% of the loan principal — will arrive around month 19 and get applied to the balance. If you don't make that prepayment, the loan re-amortizes and your monthly payment jumps, sometimes substantially (CFPB, Issue Spotlight on Solar Financing, 2024-08-07).

That 30% figure wasn't arbitrary. It was sized to match the 30% federal residential solar tax credit (Section 25D) that homeowners were expected to receive and apply as the prepayment. Section 25D ended December 31, 2025. A homeowner who finances a purchased residential system after that date, under a loan still built around a same-as-cash structure, has no tax credit arriving at month 19 to make that payment — the loan may still be written to expect one.

The CFPB's report predates the credit's expiration and doesn't address this scenario directly, so this is a reasonable inference, not a regulator finding. If you're looking at a solar loan today with a "reduced payment period" or "same-as-cash" feature, ask the lender in writing what the payment becomes if no prepayment is made, and don't assume a tax credit will be there to cover it.

What California law already requires you to be shown

California doesn't currently regulate the dealer fee itself, but it does regulate what you're supposed to see before you sign. Business & Professions Code § 7169 requires the Contractors State License Board, working with the CPUC, to maintain a Solar Energy System Disclosure Document that every solar contract must carry on its cover page, in boldface 16-point type, showing total cost and payments including financing costs, complaint contact information, and your cancellation rights. Per the CPUC's guidance on these disclosure documents, you're entitled to two separate documents: the cover-page disclosure, and a Solar Energy System Supporting Information (SESSI) form — version 2, issued 2025-07-28, is the current version used for interconnection. Both are required to be typewritten, not handwritten, under CPUC Resolution E-5364.

You also have a statutory right to cancel: three business days generally, extended to five for senior-citizen buyers and seven for contracts tied to a declared disaster, under Business & Professions Code § 7159 — with a full refund of anything paid due within 10 days of the contractor receiving your cancellation notice. That right doesn't apply if you negotiated the contract at the contractor's own place of business.

Solar work in California is typically performed under a C-46 (solar), C-10 (electrical), or B (general building) CSLB license — worth checking regardless of financing terms.

How to ask for the cash price — and what to do with the answer

The fastest way to see your dealer fee is to ask for two numbers in writing, before you sign anything: the cash price for the exact system, and the total amount financed under the loan you're being offered. Subtract the first from the second. What's left over is approximately the dealer fee (it may include small additional lender charges, but the dealer fee is almost always the bulk of the gap).

This isn't a CSLB-mandated script — the Board's own consumer guidance tells you to get competing bids from at least three contractors and get all costs in writing, but doesn't use the term "dealer fee" or instruct you to request a cash quote specifically. The technique itself comes from general consumer-finance practice built on the CFPB's findings, not from a state disclosure form.

Get a cash quote from at least one other installer too, and compare. If a company won't give you a cash price, or gives you one that moves once you mention financing, treat that as your answer.

A note for anyone reading this after early 2026: California Senate Bill 784 would require lenders to give a specific written disclosure of the dealer fee's dollar amount before loan signing. As of its last recorded action (2026-08-13), it remains a two-year bill held under submission in the Assembly Appropriations Committee — it is not law, and its status should be verified before relying on it.