Mosaic is the largest residential solar lender in the U.S. by loan volume, and there's a decent chance your solar installer will offer Mosaic financing during your sales conversation. The headline rates — starting at 3.99% APR — are genuinely attractive. But the full picture requires understanding how dealer fees work, because what looks like a $24,000 loan can quietly carry an extra $4,000–$6,000 in financing costs that you don't see until you read the fine print.
Here's an honest review of Mosaic's 2026 loan products and how to evaluate whether they're right for your situation.
Disclaimer: Mosaic loan rates and terms are subject to change and vary based on your credit profile, state, and the installer you work with. Dealer fees are set by participating installers, not Mosaic, and vary. Section 25D residential solar credits expired December 31, 2025. This review reflects publicly available information as of mid-2026 — always verify current terms directly with Mosaic and your installer.
Key Takeaways
- Mosaic rates range from 3.99–7.99% APR in 2026 for qualified borrowers; most homeowners receive 5–7%
- Loan terms run 10–25 years — longer terms lower monthly payments but add significant total interest
- No prepayment penalty — you can pay off early without fees
- Dealer fees of 15–30% paid by Mosaic to installers inflate your loan principal — a $24,000 system may carry a $28,000+ loan
- Same-day approval is standard; funding typically occurs within a few business days of installation completion
How Mosaic Works
Mosaic operates exclusively through a network of solar installers — you can't apply directly as a consumer. When your installer presents financing options, they may include one or more Mosaic loan products alongside alternatives from competitors like GoodLeap, Sunlight Financial, or Dividend Finance.
Mosaic's loans are unsecured personal loans — they're not tied to your home's title and don't appear on your property record. This is meaningfully different from PACE financing (which creates a property lien) and home equity loans (which use your home as collateral). An unsecured Mosaic loan can't trigger foreclosure. If you default, the consequence is credit damage, not loss of your home.
The application takes roughly 5–10 minutes online, and approval decisions are typically same-day. Credit check is a hard inquiry, so applying affects your score temporarily. Minimum credit score: approximately 640 FICO for most Mosaic products, though the best rates require 720+.
Loan Products and Rates
Mosaic offers several loan products with different term structures, rate ranges, and intended use cases:
| Loan Type | APR Range (2026) | Terms Available | Notes |
|---|---|---|---|
| Standard Solar Loan | 5.99–7.99% | 10, 15, 20, 25 yr | Most common; fixed rate |
| Smart Rate / Promo Rate | 3.99–4.99% | 12–25 yr | Lower rate offset by higher dealer fee to installer |
| Short-term bridge | Varies | 1–3 yr | Designed for homeowners expecting a tax credit payoff |
The "Smart Rate" or promotional rate products deserve special attention. These offer 3.99–4.99% APR — far below market rate for an unsecured loan. The lower rate is possible because Mosaic charges the installer a higher dealer fee to subsidize the rate. That dealer fee is added to your loan principal.
In practice: a $24,000 solar system quoted with a 3.99% loan may come with a dealer fee of 25–30%, inflating your loan to $30,000–$31,200. Your rate is low, but you're paying interest on a much larger principal. The total cost of financing can exceed what a 7% loan on the actual $24,000 system would cost.
The Dealer Fee Problem in Detail
Mosaic pays solar installers a dealer fee (also called an origination fee or platform fee) for each loan originated. This fee compensates the installer for using Mosaic's platform and is how Mosaic acquires customers without a retail branch network.
The fee varies by loan product:
- Standard loan products: Dealer fees typically run 15–20% of the loan amount
- Promo/low-rate products: Dealer fees run 25–30% to offset the reduced interest income
Mosaic requires that dealers not charge consumers a fee beyond the cash price for the solar system. But the dealer fee mechanism allows the installer to set a higher "financed price" than the cash price, effectively passing the fee to you through a larger loan.
How to detect it: Ask the installer for both a cash price and a financed price before seeing any loan paperwork. If the financed price is more than 5% above the cash price, you're likely looking at a dealer fee being passed to you. The difference between the two prices is a direct cost of the financing structure — not the solar equipment.
Loan Terms and Total Cost
Mosaic's 25-year loan terms are a selling point in sales conversations because they produce very low monthly payments — sometimes below $100/month on a $24,000 system. But the total interest cost is substantial.
| Loan Amount | APR | Term | Monthly Payment | Total Interest Paid |
|---|---|---|---|---|
| $24,000 | 6.99% | 12 years | $243 | $10,960 |
| $24,000 | 6.99% | 20 years | $185 | $20,400 |
| $24,000 | 6.99% | 25 years | $168 | $26,400 |
| $29,000 (w/dealer fee) | 3.99% | 25 years | $152 | $16,600 + $5,000 dealer fee = $21,600 |
The last row illustrates how a promotional rate loan can end up with comparable total cost to a standard rate loan — the low APR is offset by the higher principal from the dealer fee.
What Mosaic Does Well
Fast approval and funding. Same-day decisions and 2–5 day funding post-installation is genuinely convenient.
No prepayment penalty. This matters: if you receive a tax refund, sell an asset, or simply want to accelerate payoff, you can make extra payments without penalty. This effectively lets you treat the loan as shorter-term than contracted.
No home lien. Unlike PACE or home equity loans, a Mosaic default doesn't directly threaten your home title. Credit damage, yes — foreclosure, no.
Wide installer network. Because Mosaic works with thousands of installers nationally, their loan products are readily available across most of the U.S.
When to Use Mosaic (and When to Shop Elsewhere)
Use Mosaic when: You can't access home equity financing, you've compared the cash price vs. financed price and the spread is under 10%, and the effective APR on the actual system cost is competitive with other options.
Shop elsewhere when: You have home equity available at 7–9% — a home equity loan avoids the dealer fee problem entirely. Also compare Goodleap and Dividend Finance rates before committing to Mosaic.
Use our Solar ROI Calculator to model whether the Mosaic loan terms — at the inflated principal — still produce a positive return on your specific electricity rate and sun hours.
Comparing loan financing vs. lease? Our Solar Lease vs Buy vs PPA Calculator lets you enter exact loan terms alongside lease and PPA scenarios for a full 25-year comparison.
Related Guides
- Solar Loan vs Cash Purchase 2026 — Is the interest worth it versus paying cash?
- Home Equity Loan for Solar 2026 — How to use home equity to avoid the dealer fee problem.
- Solar Financing for Bad Credit 2026 — Options if your FICO is below Mosaic’s minimum.
- Solar Lease Fine Print Guide 2026 — Why some homeowners prefer a lease over any loan.
