The dealer fee is the most expensive line item in your solar loan.

Six months ago a homeowner in Lakewood forwarded us a proposal that quoted "0.99% APR for 25 years." It looked like the deal of a lifetime. It wasn't. The cash price of the same system, paid up front, was $6,800 lower.

That gap has a name. The industry calls it a dealer fee — an upfront markup the lender pays the installer in exchange for offering a below-market rate. The homeowner doesn't see it as a line item. They see it baked into the principal of the loan.

How the math actually works.

Suppose you're quoted a $24,200 system, financed at 0.99% APR over 25 years. The lender knows that rate doesn't cover their cost of capital, so they charge the installer a fee — typically 22–28% of the financed amount — and the installer rolls that fee into your loan principal.

On a $24,200 system with a 25% dealer fee, the loan principal becomes $32,267. You'll make 300 monthly payments of about $122. Total paid: $36,500. Compare that to paying $24,200 in cash today, even at a 5% opportunity-cost discount rate: present-value cost is $24,200.

"The loan is structured to feel cheap and audit expensive. That's a design choice, not an accident."

We've reviewed 312 proposals where a dealer fee was disclosed in the fine print. The median fee was 24.7%. In none of them was the cash-price equivalent shown next to the financed price. That's not regulatory failure — it's a marketing convention the industry has settled into.

How to spot it before you sign.

Three places to look. First, ask for the cash price in writing. If the installer says they "don't quote cash," the dealer fee is the reason. Second, request the loan agreement's truth-in-lending disclosure — the amount financed line will not match the system price. The difference is the fee. Third, run the numbers yourself: a 25-year payment stream at any APR has a present value. If the present value of the loan exceeds the cash price by more than ~5%, you're looking at a dealer fee.

What we report in an audit.

When we audit a financed proposal, we report two numbers: the cash-equivalent system cost and the effective APR — the rate that makes the present value of the payment stream equal the cash price. On the Lakewood quote, the effective APR was 8.4%, not 0.99%. That's the number the homeowner needed to compare against a HELOC, a personal loan, or paying cash.

The dealer fee isn't fraud. It's disclosed somewhere in the loan paperwork. But it's disclosed in a way that nobody who isn't already looking for it will find. And it's almost never benchmarked against the cash alternative the homeowner could have negotiated.

The fix is simple, and it doesn't require new regulation: ask for the cash price, run the present-value comparison, and reject quotes that won't show their work. The companies that won't are telling you something.