“$0 Down” Means “$0 Cost”
Most of the solar ads you'll see in 2026 — “Pay $0 for solar for 18 months,” “Rent solar instead of buying,” “Save $100 a month, every month” — are selling some version of a Third-Party-Owned (TPO) lease or power purchase agreement. The implicit argument: zero upfront cost is the best customer outcome.
“$0 down” doesn't mean “$0 cost.” It means the cost moves somewhere you can't see at the moment you're signing.
Under a TPO arrangement, a third-party investor owns the panels on your roof. That investor captures the federal tax credits on the system, plus accelerated depreciation, plus bonus depreciation. Some fraction of that captured value gets passed through to you as a lower monthly payment. The rest stays with the investor. That spread — between what gets captured and what gets passed through — is the actual cost of “$0 down,” and it isn't itemized anywhere on the contract you sign.
The “30% federal tax credit” you may see referenced in a TPO pitch is the base commercial credit (Section 48E of the Internal Revenue Code). The actual credit is built in layers, and the layers stack:
30% base credit (§48E). Applies to qualified solar projects placed in service in 2026.
+10% domestic content adder. If enough of the system's manufactured components are US-produced, the credit jumps from 30% to 40%. On rooftop solar, the practical compliance levers are the aluminum racking, the panel modules and frames, and the inverters. TPO equipment lists — Approved Vendor Lists, or AVLs — are typically curated to clear that threshold. The compliance is deliberate, not accidental.
+10% energy community adder. If your address sits in a qualifying census tract — brownfield, coal-closure area, fossil-fuel-employment-dependent — another 10% lands on top. Parts of Texas qualify. As a homeowner, you have no clean way to know whether your address triggers it without consulting the IRS's energy-community map.
+10% or +20% low-income community bonus. Allocation-limited and harder to qualify for, but real. Some TPO operators structure their portfolios specifically to capture it.
Stacked, the federal credit alone on a typical residential TPO can land at 40% — and in eligible locations, 50% or more. On top of that, the investor takes accelerated depreciation under MACRS (with the basis only slightly reduced by the credit), and in many tax years, bonus depreciation that pulls most of the deduction into year one. None of this is illegal or hidden. It's the tax structure §48E was written to enable, and it's how commercial-scale solar gets financed.
The “30% credit” named in a TPO sales pitch is a floor, not a ceiling. The actual captured value runs significantly higher, and the difference between what gets captured and what shows up in your monthly payment is what doesn't get talked about.
A few more structures embedded in standard TPO language:
You can't buy the system for at least five to six years. IRS recapture rules on the depreciation the investor is taking force a minimum ownership window — so the “buy it whenever you want” language in some sales pitches isn't accurate. Earliest buyout windows are typically year six or year seven.
The buyout price is “fair market value” — as defined by the contract. Not what a willing buyer would pay on the open market. The TPO contract specifies the formula. Customers commonly find that the contractual FMV runs well above the depreciated value the system would actually fetch in an arm's-length sale.
Most contracts include an annual escalator on your monthly payment. Typically 1–3%, sometimes higher. Year-one math and year-fifteen math look very different. Run both before you sign.
Selling the home isn't straightforward. The lease must be assumed by the buyer (which requires their lender's sign-off and a credit check), or bought out at the contractual FMV. Either path adds friction at closing that owners-without-leases don't face.
When TPO actually is the right call
TPO is a real structure that's the right answer for a real household profile:
You don't have the cash for a system and can't (or don't want to) take on a solar loan, but you want solar on the roof. TPO is one of the few paths that's genuinely $0-out-of-pocket at signing. If the alternative is no solar at all, the structure is doing real work for you.
You're planning to stay in the home long enough for the math to amortize. Roughly a decade or more. Short-stay homeowners take the worst of the structure — escalator without enough years to benefit, plus the assumption-or-buyout friction at sale.
You have low or no federal tax appetite. If you wouldn't have efficiently used a residential tax credit even when one existed, the investor monetizing it on your behalf is capturing value you couldn't have captured anyway.
You explicitly want to offload equipment-replacement and monitoring decisions, and you're willing to accept that you can't modify the system, add a battery, or choose your installer for any future work without the TPO's sign-off. For some households — particularly homeowners who have no interest in interfacing with installers or monitoring dashboards — that trade-off is a feature.
If that profile doesn't describe you, the question to ask the TPO salesperson is the one their pitch is designed not to surface: how much value is the investor capturing on this system, and how much of it am I actually seeing?