GoodLeap vs. Mosaic Solar Loans (2026): Unmasking the 30% Dealer Fee Fintech Duopoly
Forensic comparison of the two largest residential solar lenders in America: hidden origination buydown fees, True Effective APR, and 18-month re-amortization traps.
The Verdict: Neither — Use a 0%-Fee Credit Union Loan, HELOC, or Same-As-Cash Option
GoodLeap and Mosaic finance the vast majority of residential solar loans in the United States. Neither is 'cheaper' when you select a 2.99%, 3.99%, or 4.99% APR promotional loan: both lenders charge the installer a 25% to 35% dealer origination fee that is silently added to your Day-1 loan principal, resulting in a ~9.2% True Effective APR and a massive loss if you sell your house or pay off the loan early.
Side-by-Side Spec Matrix: GoodLeap (formerly Loanpal) vs. Mosaic (Solar Mosaic)
| Audit Metric | GoodLeap (formerly Loanpal) | Mosaic (Solar Mosaic) |
|---|---|---|
| Primary Business Model | Point-of-Sale Solar & Home Improvement Fintech Lender | Point-of-Sale Residential Solar Loan Platform |
| Typical Quoted Price ($/W) | Adds +$0.85 to +$1.35 / W in hidden dealer fees | Adds +$0.80 to +$1.30 / W in hidden dealer fees |
| 10 kW System Turnkey Quote | Inflates a $27,000 cash system to ~$39,400 Loan Principal | Inflates a $27,000 cash system to ~$38,900 Loan Principal |
| Hidden Loan Dealer Fee Markup | 26% – 35% Upfront Origination Markup on 2.99%–4.99% APR loans | 25% – 34% Upfront Origination Markup on low-APR promo loans |
| 25-Yr Lease / PPA Escalator Terms | 18-Month Voluntary Prepayment Re-Amortization Clause | 18-Month Re-Amortization Target (30% paydown jump at Month 19) |
| Solar & Battery Hardware Used | Finances any installer hardware (UCC-1 fixture filing recorded) | Finances any installer hardware (UCC-1 fixture filing recorded) |
| BBB / Consumer Review Rating | 1.5 / 5 Consumer Review Avg (Complaints over undisclosed principal bloat) | 1.4 / 5 Consumer Review Avg |
| Customer Support & Service Score | 5.4 / 10 | 5.1 / 10 |
| #1 Contract Red Flag to Watch | 3.99% APR 25-year loan secretly adds ~$11,500 to your Day-1 principal balance | Month-19 payment shock (+35% monthly payment jump) if you don't send a 30% lump-sum payment |
🔍 FORENSIC ANALYSISForensic Pricing & Contract Breakdown: GoodLeap (formerly Loanpal) vs. Mosaic (Solar Mosaic)How sales commissions, dealer fees, and lease escalators impact your 25-year ROI
How the Month-19 Payment Jump Works: Both GoodLeap and Mosaic structure their loans assuming you will hand over a 30% lump-sum payment by Month 18 (a holdover from the repealed §25D tax credit era). Since Congress repealed the 30% homeowner §25D credit for systems installed after Dec 31, 2025, any homeowner who doesn't come up with $10,000+ out of their own pocket by Month 18 sees their monthly solar loan payment jump by ~38% in Month 19!
If you must finance through GoodLeap or Mosaic, ask your installer for their '0% Dealer Fee / Same-As-Cash APR tier' (typically 8.99%–9.99% APR with $0 principal markup). That keeps your principal at $27,000 instead of $39,400, allowing you to refinance or pay off early without losing $12,400.
⚖️ HOMEOWNER FAQWhy does my GoodLeap or Mosaic solar loan payment jump by 35%+ at Month 19?
Solar loans automatically re-amortize at Month 18. For the first 18 months, your payment is artificially calculated on only 70% of your loan balance. Unless you make a voluntary 30% lump-sum principal payment out of pocket by Month 18, the loan re-amortizes onto the full 100% balance at Month 19.
⚖️ HOMEOWNER FAQHow do I avoid the $11,000 GoodLeap or Mosaic dealer fee?
Tell your solar installer: 'Give me your Same-As-Cash contract price with zero lender dealer fees.' Then pay via cash, a local credit union solar loan, or a 0%-fee HELOC.
Bypass GoodLeap (formerly Loanpal) & Mosaic (Solar Mosaic) Markups — Source UL9540 Battery Hardware Direct
Turnkey solar salespeople routinely charge $3.60–$4.80/W by bundling 30% loan dealer fees and $12,000+ battery margins. Buying Tier-1 UL9540 hardware directly—either DIY or hiring a local licensed electrician ($1,500–$2,500)—cuts total cost by 50–65%.
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