Solar Without the Tax Credit: The 2026 Cash-Buyer Math

By SolarCostData Data Desk · Reviewed September 2026 · Corrections log

Is solar still worth it without the tax credit? That’s the real question behind every 2026 quote, because every quote you’ll get is built to look its best. Most still bake in a 30 percent federal tax credit that no longer exists for people who buy their own system — the residential §25D credit expired on December 31, 2025 . (If your system was installed in 2025, you can still claim it on the return you file this year — the tax-season checklist walks through Form 5695.) Strip that assumption out, add no state rebate, and you’re left with the one number a lead-generation site will never lead with: what a full-price system, without the tax credit, actually costs to break even. Here it is, worked out plainly.

One thing this page is not. It answers a single question — how many years of bill savings it takes a cash buyer, with no incentive of any kind, to earn back the full price — and it stops there on purpose. It has nothing to say about leases, how long you plan to stay in the house, the state of your roof, resale value, or any of the reasons that never fit on a spreadsheet. That broader judgment lives in is solar worth it in 2026 . Come here for the arithmetic; go there for the decision.

The setup: one system, no tax credit, no help

Start with a typical residential job at the national average installed price: 8 kW at $2.58/W ≈ $20,640 (EnergySage, Aug 2026), gross. In 2026 the federal credit on a cash or loan purchase is $0, and for this exercise we assume no state or utility incentive either. So the net cost is the gross cost: $20,640, full stop.

At the 51-state mean production of 1,328 kWh per kW, less a 10 percent roof derate, that system generates on the order of 9,560 kWh a year. Every kilowatt-hour it offsets is worth what you’d otherwise pay the utility for it, and there are two honest ways to turn that into a payback . The simple division is the napkin version — gross price over first-year savings:

$$\text{Payback (years)} \approx \frac{$20{,}640}{9{,}560 \text{ kWh} \times \text{your rate}}$$

At the 17.0¢ U.S. average, that’s $20,640 ÷ $1,626 ≈ 12.7 years. The full model — the one behind every figure in the table below, shared with our state pages and the savings calculator — additionally counts 2.5%/yr utility-rate inflation, $150/yr of running costs, one inverter replacement, and each state’s real export-credit regime instead of assuming every exported kilowatt-hour earns full retail. On the same national inputs it lands at 12.3 years. The two differ, and every payback quoted below is the full model.

Nothing else moves the needle nearly as much. Not the panel brand, not the financing gimmick. Your electricity rate is the lever, and it swings the payback below by a factor of three.

The breakeven, rate by rate

Here’s that full-price arithmetic run against a spread of real 2026 electricity rates — average residential prices from the U.S. Energy Information Administration (EIA ) — using each named state’s own installed price, production and export rules, exactly as published on our state pages. The U.S.-average row applies the national price and mean production to the national average rate.

Two rows look wrong and aren’t. Massachusetts beats California outright — a slightly lower rate than Hawaii’s tier but full-retail net metering, against California’s NEM 3.0 paying roughly 6.5¢ for exports. And Idaho out-earns Nevada on first-year savings ($1,023 vs $909) yet still pays back almost two years later, because an installed watt runs about $2.38 in Nevada and $3.05 in Idaho — the sticker price outweighs the earnings gap.

Read down the payback column and the honest picture appears. At the top, high-rate states hand you a payback most people would take without blinking — eight to ten years, entirely on bill savings, with no credit propping it up. In the middle, at the national average, you’re staring down a little over twelve years, which is comfortably inside a panel’s life but long enough that the decision turns on how long you’ll stay in the house. At the bottom, cheap-power states push payback toward and past twenty years, and at that point a cash purchase is closer to a lifestyle choice than an investment.

Where the breakeven line actually falls

Run the model backwards at the national price and production and the cutoffs are easy to name. For a ten-year payback on a full-price system you need a rate around 21¢/kWh. For fifteen years, about 14.8¢. For twenty years, roughly 10.7¢. So a rough rule for 2026 cash buyers with no incentives:

• Above ~21¢/kWh: payback lands at ten years or better on savings alone. Buy with confidence.
• Around 15–17¢/kWh: payback lands in the 12-to-15-year range. Worth it if you’re staying put; marginal if you might move.
• Below ~11¢/kWh: a full-price cash purchase takes 20 years or more. Don’t buy on the numbers alone.

Your own installed price and export regime move these lines — that spread is exactly what the table above shows. And one caveat with one clarification. The clarification: rising utility rates are already inside these numbers — the model assumes rates climb 2.5 percent a year — so don’t mentally credit solar for that a second time. The caveat: $20,640 sitting in an index fund would compound instead, so the true comparison isn’t solar versus nothing, it’s solar versus your next-best use of the cash. A twelve-year payback is a weaker deal than it looks once you account for that.

What a loan does to the honest number

Most people don’t hand over $20,640 in cash — they finance it, and that quietly makes the no-incentive math worse, not better. A solar loan carries interest — and many low-APR offers bury a dealer fee in the principal on top of it — so in a full-price year those costs are added to a system that’s already lost its 30 percent discount. If your loan rate is higher than the return you’d earn on the same money elsewhere, the financed system costs more in total than the cash figure in the table above, and the effective payback stretches further.

The rate-driven pattern still holds — a high-rate state absorbs loan interest far more comfortably than a cheap-power one, because the annual savings are larger to begin with. But the honest framing is this: the payback numbers here assume you paid cash. Add a loan at a meaningful interest rate and every row gets slower. In a low-rate state, a financed no-incentive system can spend most of its early life underwater. Know which number you’re actually looking at before you sign, and compare the loan’s total cost against simply keeping the cash invested — the cash vs. loan vs. lease calculator runs all three structures side by side on your own quote.

Where the arithmetic runs out

There’s no spin available here: in a low-rate state, paying cash with no incentive, a twenty-year breakeven on a depreciating asset — before you count the opportunity cost of the money — is simply what the model returns. No framing improves it, and that is the end of what this page can tell you.

What it can’t tell you is what to do instead, because that’s a question about structure rather than arithmetic. A state or utility incentive shrinks the numerator. A lease or PPA moves the surviving §48E credit to a party who can actually use it and drops your entry cost to zero. Community solar sidesteps the roof entirely. Those trade-offs are weighed in the worth-it guide ; none of them belong in a breakeven table.

And where it does work, it works without any of the marketing. A Hawaii or California homeowner doesn’t need a tax credit to make this pencil; the rate does the whole job. That’s the quiet takeaway of a no-incentive year — solar didn’t stop making sense, it just stopped hiding behind a subsidy.

Run your own number

Don’t take the table as your answer — take it as the method. Put your real bill and your actual rate into the 2026 solar savings calculator , which runs this exact $0-credit model, and check where your state lands in the 50-state payback ranking . If the honest, incentive-free number works for you, buy. If it doesn’t, that’s worth knowing before an installer talks you past it. And if you’re not even sure solar is the right question yet, the should-I-go-solar screener asks the four questions that matter before you dig into a breakeven table like this one.

This page versus the guide. What you’ve just read is the arithmetic in isolation: one system, one model, six rates, no incentives. Is solar worth it in 2026? is the decision that sits on top of it — buy against lease against subscribe, what a short ownership horizon does to a twelve-year breakeven, and the four situations where the answer is no whatever your rate says. If the number here surprised you in either direction, that’s the page to read next.

Frequently asked questions

Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.

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