Buying, financing, leasing, or a solar PPA: compare the full commitment
Compare ownership, cash prices, loan fees, escalators, ongoing utility bills, service responsibilities, and home-sale obligations before choosing how to pay for solar.
Sources reviewed: 2026-10-06
Key takeaways
- A cash purchase or financed purchase gives you equipment ownership; a lease or PPA generally does not.
- Compare the cash price, financed principal, total payments, and obligations, not just a low monthly payment.
- A solar payment normally exists alongside any remaining utility charges.
- Tax-credit assumptions, payment increases, contract transfers, and roof-work terms need independent written verification.
Four ways to pay, four different obligations
Buying solar equipment is different from paying to use somebody else's equipment or buying the electricity it generates. In a cash purchase, you pay the installation price and own the system. In a financed purchase, you own the system subject to the loan and any security agreement. In a lease, a provider owns the equipment and charges for its use. With a power purchase agreement (PPA), the provider generally owns the system and charges for generated electricity under the contract. The FTC's solar consumer guidance explains these distinctions.
There is no universally best arrangement. Your access to cash, borrowing terms, plans to move, ability to handle maintenance, and utility tariff all matter. A zero-down offer is a payment structure, not free equipment. Ask the salesperson to identify exactly which of the four arrangements is offered and who owns the system during and after the contract. Obtain the complete agreement before deciding; a summary slide or verbal promise is not enough to understand the commitment.
What you own and what you pay for
- Cash purchase: You own the equipment. Pay the agreed installation price and arrange uncovered service.
- Financed purchase: You own equipment subject to loan terms. Pay principal, interest, and any included charges.
- Lease: Provider generally owns equipment. Pay for its use under the lease.
- PPA: Provider generally owns equipment. Pay for generation under the power-purchase contract.
Diagram sources: consumer.ftc.gov
Cash purchases: compare the actual installation scope
For a cash purchase, establish the gross solar-only price before subtracting incentives. Divide it by the system's DC watts to compare dollars per watt with other quotes of similar scope. Keep batteries, roofing, electrical upgrades, and other work on separate lines. Cash eliminates financing charges, but it also uses money that could have other purposes. The solar cost guide explains how to normalize equipment and installation prices without confusing a bundled project with the price of the array.
Review payment milestones, cancellation terms, permit responsibilities, and what happens if installation or utility approval is delayed. Identify exclusions before paying a deposit. Ownership makes you responsible for arranging service outside covered warranties, unless a separate service contract says otherwise. Retain equipment serial numbers, warranty documents, monitoring access, installation plans, inspection records, and permission to operate. A purchase is not complete simply because panels are attached to the roof; the paperwork and service arrangements are part of what you are buying.
Solar loans: the interest rate is only one part of the price
A low advertised interest rate can coexist with a high financed price. The CFPB's 2024 solar-financing report documented lender and installer arrangements in which dealer fees or other markups were included in the loan principal. That report describes historical consumer risks; it does not establish the terms of every lender today. Request a cash price and a financed price for identical equipment and installation scope, then ask the lender to explain the difference in writing.
Compare amount financed, annual percentage rate, term, scheduled payments, total of payments, prepayment rules, and any lien or security interest. Determine whether the early payment shown in a proposal changes later, including when an expected lump-sum prepayment is not made. Ask whether payment starts before installation, before permission to operate, or after a stated milestone. A long loan can make a monthly payment look comfortable while increasing total cost and leaving debt after a move or equipment replacement.
An illustrative payment comparison
Suppose the same installation has a $24,000 cash price but a $30,000 financed principal. The difference is $6,000 before interest. If a hypothetical loan requires 240 equal monthly payments of $190 with no other payment or fees, scheduled payments total $45,600: 240 multiplied by $190. These invented numbers illustrate comparison arithmetic, not a market quote or a calculated APR. Ask for the lender's actual disclosure and amortization schedule; a principal amount and one advertised monthly figure cannot establish the whole obligation.
Compare the solar payment plus the residual utility bill against a consistent no-solar scenario. Keep maintenance, insurance changes, and possible replacement costs visible. Avoid calculating savings from a future electricity-rate increase presented as certain. The FTC warns that future utility rates are difficult to predict. Test an unchanged-rate case alongside any escalation case, using the same production forecast and household demand. A financing offer should remain understandable without relying on a best-case tax payment or electricity-price forecast.
Follow the money before calling it savings
- Find the cash-equivalent scope: Same equipment, production assumptions, and installation exclusions. (Compare financing)
- Count the entire commitment: Upfront payment, all scheduled payments, prepayments, and fees. (Add remaining costs)
- Compare household totals: Include utility charges and uncovered service; test more than one future-rate scenario.
Diagram sources: www.consumerfinance.gov, consumer.ftc.gov
Leases and PPAs: understand what the payment buys
A lease generally charges for use of the system; a PPA charges under a specified electricity-pricing arrangement. The FTC guidance describes provider ownership, contract increases, maintenance responsibilities, and end-of-term choices. Read how the agreement treats actual generation, estimated generation, minimum payments, and production guarantees. If a PPA bills for all energy generated, some paid-for energy may be exported under a utility tariff that credits less than the PPA price. Check the contract and tariff together.
Ask whether the price escalates, how often, whether there is a cap, and how it is calculated. In a hypothetical lease starting at $100 per month with a 3% annual increase, the year-two monthly payment would be $103 and year-three $106.09. This is compound growth, not a prediction of available offers. A fixed price and an escalating price are different commitments even when the initial payment is identical. Utility purchases can still be required when solar production is insufficient.
Do not finance around an assumed tax credit
Some older solar proposals and educational materials describe tax-credit arrangements that are no longer applicable to new installations. The IRS's current guidance states that the residential clean-energy credit is not available for property placed in service after December 31, 2025. A homeowner considering a new 2026 installation should not budget a residential credit automatically. Existing unused credit carryforwards, past installations, and business-owned equipment can involve different questions requiring qualified tax advice.
If a loan expects a future prepayment, verify the obligation independently of any incentive story. Ask for the payment schedule both with and without that prepayment and identify the source of the funds you would use. For leases and PPAs, do not assume that provider-side benefits are homeowner tax benefits. State and utility incentives have separate eligibility, ownership, funding, and application rules. Confirm those rules with the administering agency rather than treating the seller's net-price calculation as a tax determination.
Selling the home and replacing the roof
Before signing, read transfer, early payoff, buyout, relocation, and end-of-term provisions. A buyer may need to satisfy the provider's requirements before assuming a lease or PPA. A financed system may require loan payoff or another arrangement at sale. The FTC recommends understanding these obligations in advance. Do not assume a future buyer will accept your payment or that a promised home-value increase will cover a buyout. Ask for written illustrations of the contract's transfer and termination calculations.
Roof work creates another separate obligation. Identify who authorizes removal and reinstallation, who performs it, who pays, and how interruption affects payments or guarantees. A maintenance promise may cover a failed inverter but exclude panel removal for unrelated roofing work. Coordinate this issue with the roof and solar planning guide. Request the relevant contract clauses, not a reassurance that the company will take care of it. Keep a copy accessible for your roofer and any future real-estate transaction.
A fair side-by-side decision
Request all proposals for the same array size, expected first-year production, battery scope, roof work, and tariff assumptions. Compare upfront payment, scheduled payments, financing charges, expected remaining utility purchases, service responsibilities, transfer restrictions, and the outcome at the end of the agreement. In ownership cases, separately account for potential equipment replacement. In provider-owned cases, separately account for buyout or removal provisions. Keep avoided utility charges distinct from loan or lease payments so gross energy savings are not mistaken for net household savings.
Use the quote analyzer and comparison checklist to identify missing assumptions, not to substitute for legal or lending disclosures. Review the utility directory for the rules governing exported energy. The final choice should answer three questions plainly: what do I own, what am I committed to pay, and what happens when my home or circumstances change? If those answers are unclear, request clarification before signing rather than relying on the initial monthly payment.
Questions that separate competing payment options
| Decision | Owned system | Lease or PPA |
|---|---|---|
| Who owns equipment? | Homeowner, subject to purchase and lending documents | Generally the provider during the contract |
| How do I compare cost? | Cash price, amount financed, total payments, and service costs | Payments or generation price, increases, fees, and end-of-term terms |
| Who repairs equipment? | Check manufacturer, installer, and separate service coverage | Check provider responsibilities and exclusions in the agreement |
| What happens at home sale? | Check loan payoff, security interests, and warranty transfer | Check buyer approval, transfer fees, buyout, and termination |
| Can utility charges remain? | Yes, subject to consumption and tariff | Yes, subject to consumption and tariff |
Frequently asked questions
Is zero-down solar free?
No. It means no initial payment under a particular arrangement, not no financial obligation. Loan, lease, PPA, and residual utility payments can still apply.
Why can the financed price exceed the cash price?
Fees or markups may be included in the principal. The CFPB documented this risk in solar lending. Request two written prices for identical scope and the actual lending disclosures.
How is a PPA different from a lease?
A lease generally pays for equipment use. A PPA pays for electricity under the agreement's pricing rules. The provider generally owns the system in both cases.
Can I assume a 2026 residential solar tax credit?
No. Current IRS guidance states that the residential clean-energy credit is unavailable for property placed in service after December 31, 2025. Past-year credits and other programs require separate review.
Will solar financing replace my utility bill?
Not automatically. Add remaining utility charges to the solar payment when comparing household cash flow. Production and electricity rates are not guaranteed by the existence of a loan.
Can I transfer a lease when selling my home?
Only under the contract's conditions. Buyer approval, notices, fees, buyout, and termination provisions differ. Review them before signing, not only when a sale is underway.