Solar loan rates advertised at 1.99% or 3.99% can look better than any mortgage. The catch is usually a dealer fee: a charge the lender takes from the installer, which gets built into your system price. A low rate on an inflated price can cost more than a normal rate on a cash price.
How Solar Loan Rates and Dealer Fees Work
Specialized solar lenders buy down the interest rate by charging the installer a fee, often a significant percentage of the loan. The installer raises the price to cover it. You never see the fee as a line item unless you ask.
| Example (illustrative) | Cash | Low-APR loan | Standard loan |
|---|---|---|---|
| Quoted price | $25,000 | $32,000 | $25,000 |
| APR | — | 2.99% | 8.99% |
| What you’re really paying for | System | System + hidden fee | System + interest |
These numbers are hypothetical, for illustration only. Ask every installer for a cash price and compare.
The Tax-Credit Trap
Many solar loans were built around the 30% federal credit. Payments were set low for the first 12-18 months, on the assumption you’d pay the credit amount toward principal. If you didn’t, the loan re-amortized to a higher payment. The 25D residential credit ended for systems placed in service after Dec 31, 2025, so any 2026 loan pitched with that structure is a warning sign for homeowner-owned systems.
How to Compare Solar Loans
- Get a cash price from the installer
- Ask for the dealer fee amount in writing
- Compare total cost over the term, not just the monthly payment
- Check for prepayment penalties
- Compare with a HELOC, credit union or personal loan
Secured vs Unsecured
- Unsecured solar loans: no lien on the home, higher rates
- Secured / UCC filing: a fixture filing on the equipment that can complicate refinancing or selling
- HELOC / home equity: often lower rates; your home is collateral
Questions to Ask
- Is there a dealer fee, and how much?
- What’s the payment if I don’t make a lump-sum paydown?
- Is there a lien or UCC-1 filing?
When Paying Cash Wins
If you have the savings, paying cash avoids interest and dealer fees entirely, and usually gives the shortest payback. Even so, keep an emergency fund intact. A slightly longer payback from a fair, transparent loan can be better than draining savings you may need for roof or HVAC repairs.
Worked Example: Total Cost of Three Offers
Using the illustrative prices from the table above, here’s what each offer costs over its full term:
| Offer | Price financed | APR | Term | Monthly payment | Total paid |
|---|---|---|---|---|---|
| Low-APR loan with dealer fee | $32,000 | 2.99% | 20 years | about $177 | about $42,600 |
| Low-APR loan with dealer fee | $32,000 | 2.99% | 10 years | about $309 | about $37,100 |
| Standard loan on cash price | $25,000 | 8.99% | 20 years | about $225 | about $53,900 |
| Standard loan on cash price | $25,000 | 8.99% | 10 years | about $317 | about $38,000 |
| Credit union loan on cash price | $25,000 | 6.99% | 10 years | about $290 | about $34,800 |
| Cash | $25,000 | none | none | none | $25,000 |
Hypothetical offers; payments use the standard loan formula. The low-APR offer has the lowest monthly payment over 20 years, which is what most pitches lead with. On a 10-year term, the credit union loan on the cash price costs the least in total of the financed options. The way to see this is always to compare total paid, not monthly payment.
Worked Example: How Re-Amortization Raised Payments
Here’s how the old tax-credit loan structure worked, with illustrative numbers: a $25,000 loan at 3.99% over 25 years, with the first 18 payments set as if you’d already paid down $7,500 (the 30% credit).
| Stage | Balance | Monthly payment |
|---|---|---|
| Months 1–18 (set on a $17,500 balance) | $25,000 → about $24,830 | about $92 |
| Month 19, with a $7,500 paydown | about $17,330 | about $95 |
| Month 19, with no paydown | about $24,830 | about $136 |
Skipping the paydown raised the payment by almost 50%. With no 25D credit for owned systems installed after 2025, a homeowner in 2026 has no credit to make that paydown with. If a 2026 loan still has an 18-month “paydown” feature, ask what the payment will be without it.
Step-by-Step: Shopping for Solar Financing
- Get the cash price for your exact system from the installer.
- Ask for the dealer fee in writing, as a dollar amount.
- Get two outside quotes: a credit union solar or home improvement loan, and a HELOC if you have equity.
- Compare total paid over each term, as in the table above.
- Check prepayment rules and whether any paydown changes the payment.
- Ask about liens: UCC-1 fixture filing, mortgage or none.
- Compare with bill savings. See solar payback period to estimate yearly savings.
Price Data to Benchmark Against
Lawrence Berkeley National Laboratory’s 2025 data update found the 2024 median price for loan-financed residential systems was $4.7/W, against $3.5/W for cash purchases. LBNL notes that loan fees rolled into the price are part of that gap. For a 7 kW system, that’s about $32,900 versus $24,500. If a financed quote is far above the cash median per watt, ask why. See how much do solar panels cost.
Loan vs Lease vs Cash
| Loan | Lease or PPA | Cash | |
|---|---|---|---|
| Ownership | You | Company | You |
| Typical hidden cost | Dealer fee | Escalator | None |
| Monthly payment | Yes, for the term | Yes, for the term | None |
| Value at home sale | System transfers | Contract transfers or buyout | System transfers |
Full comparison in solar lease vs loan vs cash. For the tax-credit history, see is the solar tax credit gone in 2026.
Consumer Protection Resources
The Federal Trade Commission’s guide “Solar Power for Your Home” covers financing, leases and sales claims. The Consumer Financial Protection Bureau has also published material on solar financing. Read your loan’s Truth in Lending disclosure, which shows the APR, finance charge and total of payments.
FAQ
What is a good solar loan rate in 2026?
It depends on credit and market rates. Compare the total cost against a cash price, not just the APR.
Are solar loans worth it?
They can be if the total cost beats your utility savings. Watch for dealer fees.
Can I pay off a solar loan early?
Many allow it without penalty. Check the agreement.
What is a dealer fee on a solar loan?
It’s a fee the lender charges the installer to offer a low interest rate. The installer usually builds it into the system price, so you pay it through a higher loan amount.
Can I refinance a solar loan?
Often yes, if the loan has no prepayment penalty. A HELOC or credit union loan may pay it off at a lower total cost. Check whether a UCC filing has to be released.
Is a HELOC better than a solar loan?
A HELOC often has a lower rate and no dealer fee, but your home is the collateral and rates are often variable. Compare total cost and risk.
Do solar loans put a lien on my house?
Some do, through a UCC-1 fixture filing or a mortgage. Unsecured loans don’t. Ask before signing, because a lien can complicate refinancing or selling.
Sources: FTC, “Solar Power for Your Home”; U.S. DOE, “Homeowner’s Guide to Solar Financing”; IRS Residential Clean Energy Credit page; LBNL 2025 Data Update (loan vs cash medians); FTC, “Solar Power for Your Home”; CFPB solar financing materials. Accessed Oct 2026.
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