Solar Lease vs. Buy in 2026: Why the Answer Just Flipped

The decision flipped on January 1, 2026

For a decade, the standard advice was almost automatic: if you could buy your solar system — cash or loan — you should, because ownership captured the 30% federal Residential Clean Energy Credit (Section 25D) and a lease gave that credit to someone else. In 2026, that logic is dead. The One Big Beautiful Bill Act (OBBBA, Public Law 119-21, signed July 4, 2025) terminated Section 25D, and the IRS confirms the credit "is not available for any property placed in service after December 31, 2025." A homeowner who buys a system installed in 2026 gets zero federal tax credit. Not a reduced one — zero.

But Congress did not terminate everything. The commercial Clean Electricity Investment Credit (Section 48E) survives for solar on a wind-down schedule. Because a leased or PPA system is owned by a business — the third-party owner (TPO) — that business can still claim Section 48E on qualifying systems and price the lease or PPA as if it received a large federal subsidy, because it did. The result is a strange, temporary inversion: in 2026, the financing structure that used to forfeit the tax credit is now the only residential structure that can still capture one.

Almost nothing written before 2026 reflects this. If you are comparing lease vs. buy using a 2024 or 2025 article, the tax section is wrong. Here is the current, verified picture — and when each option actually wins.

What the tax law actually says now

Three provisions drive everything. First, OBBBA Section 70506 ended the Section 25D residential credit for property placed in service after December 31, 2025. There is no phase-down, no safe harbor for signed contracts — the placed-in-service date controls.

Second, Section 48E — the investment credit claimed by businesses, including residential lease and PPA providers — was not ended immediately, but OBBBA Section 70513 put solar on a clock. Per IRS Notice 2025-42, the 48E credit terminates for solar facilities placed in service after December 31, 2027, unless construction began by July 4, 2026 (12 months after enactment). Systems a TPO provider places in service during 2026 and 2027 remain squarely eligible.

Third — and this matters for the small print — Notice 2025-42 tightened how companies prove construction started, generally requiring physical work rather than the old 5% spending safe harbor. But it carved out "low output solar facilities" of 1.5 megawatts AC or less, which keep the Five Percent Safe Harbor. Every residential rooftop system is far below 1.5 MW, so TPO fleets serving homeowners have the most flexible qualification path in the industry. Notably, the termination provisions also exclude standalone energy storage: batteries are not swept into the 2027 solar cutoff under Section 48E(e)(4)(C).

The practical translation: a purchased residential system installed in 2026 carries no federal credit, while a leased or PPA system installed in 2026 can carry a 30%-class commercial credit claimed by the provider. Whether you see that value depends entirely on how the provider prices the agreement — which is why the contract review sections below matter more than ever. For the full incentive landscape, see our 2026 solar tax credit guide.

Lease vs. buy in 2026, side by side

Here is how the two paths compare on the factors that decide the outcome for a Southern California household in 2026.

When buying still wins

Losing the credit does not mean buying lost the plot — it means the payback period got longer and the comparison got closer. Southern California remains the strongest ownership market in the country for one reason: the utility rates you offset. Per the U.S. Energy Information Administration, California residential electricity averaged 35.25 cents/kWh in April 2026 — about 87% above the U.S. average of 18.83 cents. Every kWh your owned system produces displaces power at those rates, with no third-party margin taken out.

Buying wins in 2026 when: (1) you can pay cash or borrow cheaply — every point of loan APR now works directly against you with no credit to offset it; (2) you plan to stay in the home well past the payback point, so you collect the long tail of free production; (3) you want maximum control — panel choice, battery sizing, adding capacity later — without a counterparty's consent; and (4) you value a clean home sale, since owned systems transfer with the deed and avoid contract-assumption friction entirely.

Under California's Net Billing Tariff (the successor to net metering, effective for new applicants since April 15, 2023), exports are credited at the grid's avoided-cost value rather than retail rates — which is why pairing solar with a battery to consume your own power is now the default design, whichever way you finance. Run your own numbers with our California payback period guide.

When a lease or PPA wins

A lease charges a flat monthly rent for the system; a PPA charges per kWh the system produces. In both, the provider owns the equipment, handles maintenance, and — this is the 2026 twist — can monetize Section 48E. A well-priced TPO agreement effectively imports a federal subsidy the homeowner can no longer claim directly.

TPO wins in 2026 when: (1) you cannot or do not want to deploy $25,000-$45,000 of capital, and loan rates make financed ownership unattractive with no credit to soften them; (2) you want day-one savings with zero performance risk — if production falls short, that is the provider's problem, and most PPAs only bill for what the system actually generates; (3) your tax situation was never going to help anyway (retirees and lower-liability households lost nothing in the 25D sunset); or (4) you want solar now while the 48E window is open, since TPO providers' credit eligibility itself winds down for systems placed in service after 2027 without qualifying construction starts.

The catch is that none of this is automatic. Section 48E benefits the provider; competitive markets pressure them to pass it through, but nothing forces them to. The only way to know is to compare the TPO rate against your utility's rate trajectory and against a purchase quote — which is exactly the comparison we walk through in our PPA vs. prepaid vs. cash guide. A prepaid structure like the OC Solar Prepaid Plan sits between the poles: one payment, no escalator, provider retains ownership and maintenance duties.

Contract gotchas: escalators, buyouts, liens, and selling your home

Escalators are where 20-year agreements quietly get expensive. A PPA that starts at 26 cents/kWh with a 2.9% annual escalator reaches about 45 cents/kWh by year 20 — roughly a 73% increase. Whether that beats the utility depends on utility inflation, which is not guaranteed to keep pace forever. In 2026 we push clients toward 0% escalator agreements even at a slightly higher starting rate; the crossover math almost always favors flat pricing for anyone staying past year 10.

Buyout terms decide your exit options. Most agreements offer a purchase option at fair market value or a scheduled buyout price, typically starting around year 5-7. Get the schedule in writing before signing — "fair market value determined by the provider" is a red flag, because you are negotiating against the only party allowed to set the price.

Selling the home is the most common friction point. With a TPO system, your buyer must credit-qualify and formally assume the agreement, or you must exercise the buyout at closing. California's official Solar Consumer Protection Guide — which providers in SCE, SDG&E, and PG&E territory are required to have you initial and sign before interconnection — warns specifically that leases and PPAs can complicate sales and trigger substantial buyout fees. Also expect a UCC-1 fixture filing on the system: it is not a lien on your home, but title companies flag it, and the provider must temporarily release or subordinate it during refinance or sale. Ask, in writing: What is the assumption process and credit requirement? What is the buyout at each year? Who pays to remove and reinstall the system for a roof repair, and what does it cost?

Finally, verify the system is sized to your actual usage. Oversized TPO systems inflate the provider's credit basis and your payment while overproducing exports that the Net Billing Tariff compensates at avoided cost, not retail. Demand the production estimate, the consumption analysis behind it, and the guarantee terms.

What we are seeing on Southern California roofs

OC Solar is a Tesla Powerwall Premier Certified solar and battery installer headquartered at 240 Progress, Suite 100, Irvine, California, serving Orange County, Los Angeles, San Diego, Riverside, San Bernardino, and Ventura counties with 30+ megawatts installed. Our published 2025 study of 1,299 Southern California projects and service calls found a 70% battery attach rate and an 8.0 kW median system size — numbers that reflect the Net Billing Tariff reality: storage is now standard, not an upgrade, regardless of whether the system is owned or third-party owned.

That dataset shapes our 2026 advice. An 8 kW system with a battery is a $30,000-class decision, and with no Section 25D credit on a purchase, the honest answer to "lease or buy?" is genuinely situational for the first time in a decade. Households with capital and a long horizon still come out ahead owning. Households without capital — or who simply refuse performance risk — now have a structurally credible alternative, because the TPO provider can still capture the federal credit and competitive pressure pushes that value into pricing. What no one should do is decide off 2025-era content, or sign a 25-year agreement without reading the escalator, buyout schedule, and transfer clause.

Bottom line

Buy in 2026 if you have low-cost capital, a long ownership horizon, and want maximum lifetime savings at California's 35-cent retail rates — just underwrite it with zero federal credit. Choose a lease or PPA if upfront cost or performance risk is the blocker, and treat the provider's Section 48E eligibility as your negotiating leverage: ask directly how the federal credit is reflected in your rate. Either way, insist on a 0% or minimal escalator, a written buyout schedule, and clear home-sale transfer terms — and get a purchase quote alongside every TPO quote so you can see the spread yourself. Compare your options with us and we will show both sets of numbers on your actual roof and usage.