How to think about solar loan vs cash
The conventional wisdom says "cash wins" — and in pure-math terms, that's almost always true. There's no interest, no dealer fees, no 20-year obligation. If you have the cash sitting in a low-yield savings account, pulling it out for solar is generally a great use of that capital.
But "cash wins" misses the real question most people are asking, which is: can I afford solar at all? If you don't have $20,000-$40,000 in liquid savings, the choice isn't cash vs loan — it's loan vs no solar. And in most cases, a well-structured solar loan still leaves you net cash positive from month one (your monthly electric bill drops by more than your loan payment increases your bills).
The "dealer fee" trap
Here's the dirty secret of "0% APR" or "ultra-low APR" solar loan promotions: they're typically bundled with a dealer fee of 15-30% that's silently added to your loan principal. A $25,000 system financed at "0% APR" might actually be a $32,500 loan — that extra $7,500 covers the lender's interest cost up front. The federal tax credit calculates from the cash price (~$25K), not the inflated loan amount, so you lose 30% × $7,500 = $2,250 in tax credit value.
If you're financing, the cleanest play is usually a HELOC (Home Equity Line of Credit) or home equity loan at 7-9% APR with no dealer fee — straightforward interest, full tax credit value, often deductible if used for home improvements.
Solar loan APRs in 2026
| Loan Type | Typical APR (2026) | Dealer Fee? |
|---|
| HELOC / Home Equity | 7-9% | No |
| Cash-out refi | 6.5-8% | No (closing costs apply) |
| Solar-specific loan (Sunrun, GoodLeap, Sungage) | 7-12% | Usually 15-25% |
| Personal loan (no collateral) | 8-15% | No |
| Credit union solar loan | 6-9% | Usually no |
When financing actually wins
There are scenarios where loan financing leaves you better off than cash:
- You can invest cash at higher returns than the loan APR. If your cash earns 8%+ in the market and your loan is 6%, the math favors keeping cash invested and financing the system.
- Your monthly bill is high enough that loan payment is fully covered by savings. If your $300/mo electric bill drops to $30/mo and your loan payment is $200/mo, you're net positive $70/mo from day one — for 15 years, then $270/mo positive after the loan is paid off.
- Electricity inflation outpaces loan interest. If your utility rates rise 5%+/yr (PG&E, ConEd) and your loan is fixed at 7%, the locked-in solar production becomes more valuable over time relative to the loan cost.
FAQ
Is it better to pay cash or finance solar panels?
Cash wins in total cost — no interest. But financing makes solar accessible if you don't have $20K-$40K liquid, and a good loan (5-7% APR, no dealer fee) can leave you cash-positive from month one. Cash payback: 7-10 years. Financed payback: 12-18 years due to interest.
What APR is normal for a solar loan in 2026?
5.99-12.99% range. Most buyers see 7-9% on 15-20 year terms. Watch for dealer fees of 15-30% rolled into the principal — they can wipe out your federal tax credit benefit.
Should I use a HELOC or home equity loan for solar instead?
Often yes. HELOC and home equity loan APRs (7-9% in 2026) are usually lower than solar-specific loans (7-12%), interest may be tax-deductible if used for home improvements, and there's no dealer fee. Trade-off: your home is collateral.
Does the federal tax credit apply if I finance?
Yes. The 30% credit applies to the gross system price regardless of how you pay. But it does NOT apply to the dealer fee portion of a financed loan — only the actual hardware/install cost.
What if I move before the loan is paid off?
You'd typically pay off the remaining loan balance at sale (often via the home sale proceeds). Solar usually adds $15K-$25K to home value (Zillow, NREL studies), often enough to cover the remaining loan balance. Leased systems are a different story — they often complicate or block home sales.
Primary sources