Solar Lease vs PPA vs Prepaid Lease: The New Math in 2026

If you’ve been sitting on a solar quote for the last several months, trying to figure out whether to sign or walk away, you’re not imagining it. The rules genuinely changed. On December 31, 2025, the Section 25D residential solar tax credit expired under the One Big Beautiful Bill Act, and with it went the 30% federal incentive that made cash and loan purchases a reasonable financial bet for millions of homeowners. If you write a check for a $30,000 system today, the federal government sends you nothing. Zero. That’s a seismic shift, and it’s why the lease and PPA options your installer keeps pushing aren’t just a sales tactic right now. For a lot of people, they’re genuinely the better math.

Here’s what I tell people who call me confused about this: the landscape didn’t just shift for buyers. It shifted for the whole industry. According to a 2026 Aurora Solar Snapshot, nearly two-thirds of surveyed solar sales companies expect most of their projects to be third-party-owned (TPO) this year, and 55% of installers say TPO is already their most-used financing scenario. That’s not because leases are suddenly amazing. It’s because the commercial investment tax credit under Section 48E still applies to installer-owned systems through at least 2027, as long as construction began by July 4, 2026. The credit didn’t disappear. It just moved to the other side of the contract.

You might be wondering which financing path actually makes sense for your situation. That depends on your equity goals, your monthly cash flow, and how much of that 30% credit the installer is actually passing along to you. Because here’s the part that doesn’t show up in the brochure: how much of the Section 48E value flows to the homeowner varies enormously by company, with some passing through 50 to 70% of the credit value and others simply absorbing it as margin, causing PPA rates for the exact same roof to vary by 20 to 30% between installers.

What a Lease, PPA, and Prepaid Lease Actually Mean Now

These three options get lumped together constantly, and they shouldn’t be. A standard solar lease means you pay a fixed monthly amount, typically with a 1 to 3% annual escalator, and the installer owns the equipment. You’re renting the roof space, essentially, and buying the electricity at a fixed rate. A PPA (power purchase agreement) is similar in structure but you pay per kilowatt-hour generated rather than a flat fee. Both options shift ownership to a third party, which is exactly why they can still capture the Section 48E commercial ITC.

The prepaid lease is the newer one, and it’s the most interesting development to come out of the post-25D market. According to Solar Power World’s April 2026 reporting, this model lets homeowners pay roughly 70% of the total system cost upfront. That discount reflects the 30% ITC the TPO company is claiming on their end. After about six years, once the IRS recapture period for the investment tax credit clears, ownership transfers to the homeowner. You didn’t buy it. But you will own it. And you paid significantly less than full price to get there.

The Cash Purchase Problem Nobody’s Talking About Honestly

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Before the expiration of Section 25D, a cash buyer in an average-rate state could reasonably expect an 8 to 10-year payback. The 30% federal credit absorbed a huge chunk of the upfront cost. Without it, that math falls apart. A typical $30,000 system now carries a payback period of roughly 16 years nationally. In high-electricity-cost states like Massachusetts, where retail rates average around 24 cents per kilowatt-hour, you can still get under 10 years. But in moderate-rate states, buying outright with cash right now is a hard sell unless you have a very specific reason, like not wanting any lien on your property or planning to stay in the house for 20-plus years.

I’m not saying never buy. I’m saying run your actual numbers with your actual utility rate before anyone convinces you that ownership is always superior.

How to Spot a Bad TPO Deal Before You Sign

The biggest risk in the current TPO market is that 20 to 30% variation in PPA rates I mentioned earlier. You might be wondering how two installers can quote wildly different rates for the same system on your roof. The answer is how they handle the Section 48E credit internally. Some companies use that 30% credit to genuinely discount what you pay, either through lower per-kWh PPA rates or through that prepaid lease discount. Others treat it as profit. There’s nothing illegal about that. But you need to know which kind of company you’re talking to.

Here’s what I tell people: get at least three TPO quotes and ask each company directly what percentage of the Section 48E credit is reflected in your rate or discount. If they can’t answer that clearly, or if they pivot to talking about system size and production instead, that’s a red flag. A good installer should be able to show you the math. EnergySage’s 2026 analysis of prepaid leases recommends comparing the effective cost per watt across quotes rather than just the monthly payment, because the monthly payment can be manipulated in ways that hide a bad deal.

The 6-Year Ownership Path: Who It’s Actually Right For

The prepaid lease isn’t for everyone, and the industry hasn’t been great at explaining the limitations. You’re paying most of the cost upfront, which means you need the cash. You don’t get the tax credit yourself. And you’re dependent on the TPO company remaining in business for six years before ownership transfers cleanly. That third point matters more than people acknowledge, given how much consolidation has happened in the residential solar industry over the past two years.

That said, for homeowners who have the cash, who want to eventually own a system outright, and who are buying in a state with moderate electricity rates where the pure cash purchase payback is uncomfortably long, the prepaid lease hits a genuinely interesting middle ground. You get the benefit of the installer’s ITC access, reflected in that roughly 30% discount on upfront cost, without being locked into a 20-year lease with no equity. The PV Tech analysis from July 2026 notes that TPO financing structures like this are expected to carry residential solar through what they’re calling a “short-term pain” period as the market adjusts to life without Section 25D.

If you’re in active conversations with installers right now, the most useful thing you can do is slow down and ask for the specific numbers behind the rate they’re quoting. The financing structure you choose in the next few months will follow your house, and your mortgage, for years. The companies worth hiring are the ones who welcome that question instead of steering around it.

Sources

• Solar Lease vs. PPA in 2026 (January 2026)
• Prepaid Leases Provide Pathway to Home-Owned Solar Projects (April 16, 2026)
• Pre-Paid Solar Leases and PPAs: Are They Worth It in 2026? (January 2026)
• Solar Lease vs PPA vs Buying: Which Is Best in 2026? (February 2026)
• US Residential Solar to See Short-Term Pain, Long-Term Growth (July 15, 2026)
• SEIA: Clean Energy Provisions in the One Big Beautiful Bill (July 2025, updated 2026)

Photo: Robert So via Pexels

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