TL;DR:
- Cash purchase and solar loans let you claim the 30% IRA federal tax credit; leases and PPAs do not
- Solar loans can be net-positive cash flow from day one if structured correctly — watch for dealer fees buried in the loan amount
- Leases and PPAs work for homeowners who can’t use the tax credit, but they reduce long-term savings significantly
Solar financing is where more money is lost than anywhere else in the solar buying process — not from picking the wrong panels or inverter, but from signing the wrong financial product. The difference between a well-structured solar loan and a 20-year PPA from the same sales pitch can be tens of thousands of dollars over the life of the system. Here’s the honest breakdown.
The Four Options at a Glance
| Option | You Own the System | IRA Tax Credit | Typical Monthly Impact | Best For |
|---|---|---|---|---|
| Cash | Yes | Yes (30%) | Immediate savings | Capital available, 8+ yr horizon |
| Solar loan | Yes | Yes (30%) | Slight positive or neutral | Most homeowners |
| Lease | No | No (installer claims it) | Slight savings | Can’t use tax credit |
| PPA | No | No (installer claims it) | 5–15% bill reduction | Can’t use tax credit, no fixed payment |
Cash Purchase: The Highest Long-Term Return
Paying cash delivers the best 25-year return because you eliminate all financing costs. You pay the gross system cost, claim the 30% IRA credit on your next tax return, and every kWh your system produces saves you at the full retail rate.
Example (8kW system, Atlanta, Georgia):
- Gross cost: $24,000
- IRA tax credit (30%): -$7,200
- Net out-of-pocket: $16,800
- Annual savings: ~$1,340 (80% offset on $140/month bill)
- Simple payback: 12.5 years
- 25-year total savings: ~$33,500 net of system cost
The constraint is obvious: most homeowners don’t have $16,800–$25,000 sitting in cash. For those who do, the return on solar — effectively 5–8% annually after payback in most markets — competes reasonably with other investments, particularly with the certainty of locked-in electricity prices.
Solar Loans: Own the System, Finance the Cost
A solar loan functions like a home improvement loan — you borrow the installation cost, make monthly payments, and own the system from day one. Because you own it, you claim the 30% IRA tax credit.
The critical variable: dealer fees. Many solar loans — particularly those offered through installers — include a “dealer fee” of 10–30% that the installer receives from the lender for originating the loan. This fee gets rolled into the loan principal without being disclosed as a line item. A $20,000 system becomes a $26,000 loan. You claimed a $7,800 IRA credit, and the net cost looks like $18,200 — but you’ve borrowed $26,000. The maths don’t add up.
How to detect dealer fees: Ask the installer for the “gross system cost before any adders.” If the loan amount is 15–30% higher than the quoted system cost, there’s a dealer fee buried in there. Ask directly: “Does this financing include a dealer fee?”
Loan products to know:
- Home equity loan / HELOC: Lower rates (6–8%), interest may be tax-deductible. Best option if you have equity.
- Mosaic Solar Loan: Common installer-partnered product; rates vary 5.99–11.99%; watch for dealer fees.
- GreenSky / Service Finance: Frequently offered by large installers; similar rate range and dealer fee risks.
- Dividend Finance: Specialises in solar; some products have no dealer fee — confirm explicitly.
A well-structured solar loan looks like this: $20,000 system, 30% IRA credit applied in year one to pay down principal, 6.99% rate over 12 years. Monthly loan payment: ~$155. Monthly electricity savings: ~$112. After applying the IRA credit to reduce the loan principal, the payment drops to ~$108 — essentially bill-neutral from day one.
Solar Lease: Predictable Payment, No Ownership
Under a solar lease, the solar company owns and maintains the panels on your roof. You pay a fixed monthly payment in exchange for the electricity the system produces — typically set at 70–90% of your current electricity bill, creating modest immediate savings.
What you give up: the IRA tax credit (the leasing company claims the 30%); the property value uplift (owned solar can add $15,000–$25,000 to home value; leased systems complicate sales because the buyer must assume the lease or you must buy it out); and 25-year savings (owned solar typically outperforms a lease by $15,000–$30,000 over the system’s life).
When a lease makes sense: you genuinely cannot use the federal tax credit — no federal tax liability — and you want the benefits of solar without any ownership complexity. Some retired homeowners and lower-income households fall into this category.
Watch for annual lease escalators — many contracts include 1–3% annual increases in the monthly payment. A 2% escalator on a $120/month lease reaches $185/month by year 25. If electricity rates don’t rise commensurately, the “savings” disappear entirely.
Power Purchase Agreement (PPA): Pay for What You Produce
A PPA is similar to a lease but you pay per kWh produced rather than a fixed monthly amount. The PPA rate is set below your current retail electricity rate — commonly 10–20% below. The installer owns the system and claims the tax credit.
PPAs have the same ownership drawbacks as leases. The rate advantage over the grid typically erodes over time because PPA rates often include annual escalators (1–2.9%) and utility rates have historically risen by about 3%/year. The initial discount tends to shrink.
The PPA structure makes most sense when you have a large, sunny roof, your current electricity rate is high, and you truly don’t want to own the system.
Which Option Makes Sense?
Use cash if you have capital available, you’ll use the tax credit, and you’re staying in the home 10+ years.
Use a solar loan if you want to own the system, you’ll claim the IRA credit, and you can secure a loan without a dealer fee or with a competitive rate.
Use a lease or PPA if you cannot claim the federal tax credit, want zero upfront commitment, and are comfortable not owning the system.
For most homeowners in 2026, a solar loan without dealer fees is the optimal path — you own the system, claim the 30% IRA credit, and achieve day-one bill neutrality or better. Get quotes from installers who offer multiple financing options, explicitly ask about dealer fees, and compare total 25-year costs across financing structures before signing anything.