The Order That Holds: Cash, Then Loan, Then TPO
EnergySage states the ranking directly. Cash purchase “eliminates interest costs and gives you the best long-term savings.” A solar loan preserves upfront cash, but “interest payments will reduce your overall savings compared to a cash purchase.” A lease or power purchase agreement offers “$0 down” with maintenance included, but “long-term savings will often be lower than with ownership.”
Each step down that order is a trade, not a downgrade. Cash gives up liquidity for the best total return. A loan gives up some of that return for a smaller upfront outlay. A TPO deal gives up more of it again for zero money down and no ownership responsibility for maintenance.
The Anchor Numbers Before Any Path-Specific Math
Before running numbers for a specific household, the outer bounds are worth knowing: EnergySage states most homeowners save $41,000 to $155,000 over 25 years and reach payback in about 10 years. That is a wide range, and it is driven mainly by regional electricity rates and system size, not by which financing path a homeowner chooses.
The average system itself costs roughly $2.58 to $2.95 per watt before incentives in early 2026, about $31,135 for a 12kW system. That figure is the starting point every cash-versus-loan-versus-TPO comparison should be built on, since financing path changes how that cost gets paid, not what the underlying system costs to begin with.
Want this handled for you?
Exclusive, confirmed solar appointments. $300 setup + $249 per booked appointment.
Book a Solar CallWhat 2026 Changed About the Loan Side of This Math
Section 25D, the federal tax credit a cash or loan buyer used to claim, ended for good on December 31, 2025. That removes a piece of the math that used to favor ownership-based paths in prior years. Section 48E, the credit that survives, can only be claimed by whoever owns the system, which under a TPO structure is the lease or PPA provider, not the homeowner. That is part of why third-party ownership is projected to reach 65% of reps’ books in 2026, up from 44% in 2025, the tax math shifted, and the cash-versus-loan-versus-TPO comparison shifted with it.
How to Walk a Homeowner Through This Without Steering Them
Present the actual EnergySage ranking honestly: cash wins on total savings, a loan is the middle path, TPO wins on upfront cost and loses on long-term total, and let the homeowner’s own cash position and risk comfort decide which trade they want to make. A rep who leads with whichever path pays the best commission, rather than the one that fits the homeowner’s actual finances, is optimizing for the wrong number.
VA Horizon’s own appointment price does not enter into that decision at all, by design: $300 setup and $249 per booked appointment stays flat whether the homeowner ultimately lands on cash, a loan, or TPO, so there is no incentive built into the appointment itself to steer a homeowner toward one path over another.
Sources
The external data in this article draws on the sources below. Figures described in the text as estimates or industry triangulations are directional and are not attributed to a single dataset.
- EnergySage, solar cost and ROI guidance
- SEIA, clean energy provisions of the One Big Beautiful Bill
- Aurora Solar, TPO financing trends 2026