Solar Lease vs Purchase: Compare Obligations and Lifetime Costs

Compare solar financing by total obligation and contract responsibility, not by the first monthly payment. A purchase gives the homeowner the equipment and its output; a lease or power-purchase agreement leaves the equipment with a third party and creates a long service contract. The Department of Energy says buyers who own a system can receive applicable tax credits and incentives, while lease customers generally do not; it also distinguishes a fixed lease payment from a PPA’s per-kWh payment. DOE’s consumer guide lays out those structures.

The comparison sheet

Request one written proposal for each option and enter:

Field	Purchase or loan	Lease	PPA
Equipment owner	homeowner or lender collateral	lessor	developer
Customer payment	cash or loan principal plus interest	monthly rent, possibly escalated	kWh produced × contract rate
Maintenance	contract terms and homeowner responsibility	read lessor promise	read developer promise
Tax credits	potentially owner’s, if eligible	generally owner’s	generally owner’s
Home sale	payoff or transfer review	transfer, buyout, or removal clause	transfer, buyout, or removal clause

The CFPB reports that solar leases commonly run 15–20 years, may have no down payment, and can increase annually; it also warns that some solar loans include dealer fees that raise the principal above the cash price. Read the CFPB’s solar-financing spotlight. Those are market descriptions, not terms for a particular proposal.

Calculate the obligation without guessing production

For a purchase, calculate cash price + financing interest + required maintenance + roof or electrical work attributable to solar + remaining utility bill - documented incentives. For a lease, calculate sum of scheduled payments, including escalator increases + buyout/removal/transfer costs + remaining utility bill. For a PPA, calculate sum of (contract kWh price × contracted or modeled production), including escalator increases + remaining utility bill. Keep the same remaining-utility-bill assumptions across all options. Keep a range for production only when the installer gives a defensible model; do not treat a salesperson’s “zero bill” statement as an input.

Here is a hypothetical 20-year lease calculation. Assume a $160 monthly payment, a 2.9% annual escalator, and no transfer or buyout cost. The first-year payments are $1,920. The 20-year nominal payment sum is the geometric series 1,920 × ((1.029^20 - 1) / 0.029), approximately $51,069.53. That is before the remaining utility bill and any roof work. A flat $160 payment for 20 years would total $38,400, showing why “same monthly payment” and “same total cost” are different. These figures are illustrative assumptions.

Ownership and incentives need current verification

Do not subtract an old 30% residential clean-energy credit from a new September 2026 proposal. The IRS Form 5695 instructions state that residential clean-energy expenditures after December 31, 2025 do not qualify under the ended credit rules, while earlier eligible projects and carryforward provisions have separate treatment. Check the current IRS instructions. State, utility, and local incentives can have different dates and service-territory rules. Keep any documented incentive on its own worksheet line, with eligibility and application deadline.

Sale, roof, and failure clauses

Ask how the contract is handled when the home is sold: payoff, buyer assumption, purchase of the system, or removal. Ask who pays to remove and reinstall panels for a roof replacement, and whether a failed inverter changes the payment. Read the production guarantee, degradation assumption, insurance requirement, lien language, and dispute process. DOE also advises checking roof age, shade, utility rates, and net-metering rules before committing. Its homeowner guide says savings depend on usage, system size, roof conditions, utility rates, and compensation for exported electricity.

Choose the structure only after the same production model and remaining utility bill are used for each option. A lower first payment can carry a longer obligation; an owned system can carry more upfront and maintenance responsibility. The useful decision is the documented contract total at your address.