The Hidden Fee Inside Your Solar Loan

Ask your installer one question before you sign anything: what is the cash price of this exact system if I do not use your financing? If the number is thousands of dollars lower than the price on your loan paperwork, you have just met the dealer fee. Most homeowners never do, because nobody in the transaction is required to point at it.

What the fee is

Most residential solar loans in this country come from a handful of specialized lenders rather than your own bank. The installer sells you the system and hands you financing paperwork from a partner lender in the same sitting. What you are rarely told is that the lender charges the installer a large fee for originating that loan, and the installer folds that fee into the price of your system. Federal regulators who examined the practice found these markups typically run 10 to 30 percent of the cash price, and in some cases more than 50 percent.

The fee is not a line item. It is baked into the number you are told the system costs, which means you pay interest on it for the life of the loan, and it means the price you are comparing against your utility bill was never the price of the equipment and labor at all.

How a low rate is actually bought

Now the part that makes the structure work. Those loans advertise interest rates that look impossible next to anything else you can borrow, sometimes under 1 percent. The rate is real. What buys it down is the fee. The lender collects a large sum up front, hidden in your principal, and in exchange offers a rate that makes the monthly payment look small next to your electric bill. The comparison that sells the system is manufactured by the fee you cannot see.

The state of Minnesota alleged exactly that, in court, against four of the largest solar lenders in the country. The suit, filed by the attorney general in March 2024 against GoodLeap, Sunlight Financial, Solar Mosaic, and Dividend Solar Finance, alleged roughly 35 million dollars in concealed fees across more than five thousand solar purchases in that one state, with most fees inflating the borrower’s cost by 15 to 30 percent. The complaint put GoodLeap’s average fee at 19.32 percent of each loan. Three of those four companies, by one nonprofit analysis, handled roughly 80 percent of the residential solar loans in the United States. The federal Consumer Financial Protection Bureau published its own examination of the practice months later and flagged the same structure industry-wide. Enforcement has since spread to other states, including a New York action against solar sales and lending practices in 2026.

Fairness requires the other side. The lenders dispute the characterization. Their position, on the record, is that the fee is set by the installer, that the practice is regulated under the federal Truth in Lending Act, and that similar dealer-fee structures have been used in auto lending for decades. The litigation is ongoing, and nothing here should be read as a court’s conclusion. But notice what is not in dispute: the fee exists, it is large, and it is inside the price rather than beside it.

Why nobody mentions it

The installer is not eager to tell you, because the fee makes their price look worse and because their financing partner is often how they close the sale at your kitchen table. The lender is not going to tell you, because the fee is the product. And the paperwork is not going to tell you in any way that reads naturally, because the fee lives inside the system price, not in the finance charges your disclosure forms itemize.

No single company owns this story. The structure does, and it works on anyone who assumes the price on the page is the price of the hardware on the roof.

The three questions that drag it into the light

You do not need to become a finance expert. You need three questions, asked in writing, before signing:

First: what is the cash price of this exact system? Not a discount, not a different package. The same equipment, same install, paid without your financing partner. The gap between that number and the financed price is the cost of the financing structure, whatever anyone calls it.

Second: if I bring my own financing, a credit union loan or a home equity line, what is the price? Your own loan will carry a higher interest rate than the teaser rate on the solar paperwork. Run both as total cost over the life of the loan. A higher rate on an honest principal frequently beats a near-zero rate on an inflated one.

Third: is there a dealer fee or lender fee included in my system price, and how much is it? A straight answer to a direct question tells you something. So does a refusal.

The bottom line

A solar loan is not wrong for everyone, and an installer using lender financing is not automatically doing anything improper. But you cannot evaluate a price you have never actually seen. Get the cash price, get the fee in writing, and make the comparison yourself, because the one thing the current structure guarantees is that nobody else in the room will make it for you. If you have already signed and believe the price was misrepresented to you, that is a conversation for a consumer attorney, and our piece on the federal Holder Rule explains one protection that follows your loan wherever it goes. This page is general information, not legal or financial advice.