What does a 2026 install actually cost per watt?

$2.50-3.50/W for residential systems on average, depending on installer scale, system size, and roof complexity. A typical 8 kW system runs $20,000-28,000 installed before any state rebates. Larger systems achieve lower per-watt costs due to fixed permitting and labor overhead being spread across more capacity. Prices vary by state — California, Hawaii, and the Northeast trend higher; the Midwest and South trend lower.

What's the payback math without the federal credit?

Take the install cost, subtract surviving state rebates and tax credits, then divide by annual net savings (electricity-bill avoidance plus net-metering credits plus SREC income, minus any inverter-replacement reserve). On a $20,000 install with $2,000 in state credits and $1,500/year in net savings: $18,000 ÷ $1,500 = 12 years. The 30% federal credit, when it existed, removed an additional $6,000 — cutting that same payback to 8 years.

Why are HI, MA, and NJ still fast payback states?

Three factors stack: high electricity rates ($0.30+/kWh in Hawaii, $0.27 in Massachusetts, $0.21 in New Jersey), strong state programs (Hawaii's $5,000 income-tax credit, Massachusetts SMART tariff, New Jersey SuSI), and active SREC markets in MA and NJ. Each lever alone wouldn't be enough post-ITC; together they preserve 8-12 year paybacks for cash purchases.

Are TX, FL, and AZ slow payback states?

Yes — typically 12-16 years for cash purchases in 2026. Lower electricity rates ($0.13/kWh in Texas, $0.14 in Florida, $0.13 in Arizona) reduce annual savings. Florida has full-retail net metering and a property/sales-tax exemption (helps), but no state income-tax credit. Texas has property-tax exemption and utility-specific rebates. Arizona has APS avoided-cost crediting that limits export value. The math works, but the timeline stretches.

Does adding battery storage change the payback?

Usually it lengthens cash-purchase payback by 2-4 years on the system cost (batteries add $8,000-15,000 installed) but shortens it in net-metering-cut states like California, where storage allows time-of-use rate arbitrage. In full-retail net-metering states, adding a battery for backup power is a resilience purchase, not a payback improvement. Run the specific case — storage economics flipped state-by-state with NEM 3.0.

Solar payback period in 2026 without the federal credit

In most states, a 2026 cash-purchase residential solar payback runs 10-18 years at current install costs ($2.50-3.50/W) without the expired 30% federal Investment Tax Credit. Hawaii, Massachusetts, and pre-NEM-3.0 California are the fast paybacks at 8-12 years. Texas, Florida, and Arizona stretch to 12-16. The single biggest variable is no longer the panel — it's the state. Electricity rates, surviving state incentives, and net-metering rules now drive the math more than they ever did when the federal subsidy anchored everything.

The math without the 30% federal credit

A typical 2026 residential install: 8 kW system, $24,000 before incentives, on a home in a state with $0.16/kWh electricity rates and full-retail net metering. The system produces roughly 11,000 kWh/year, of which 60% offsets self-consumption and 40% exports to the grid for net-metering credit. Annual savings: 11,000 × $0.16 = $1,760 in pure electricity-bill avoidance.

Subtract any state rebate or tax credit from the $24,000 install cost. In a state like New York, NY-Sun Megawatt Block plus the 25% income-tax credit (capped at $5,000) might reduce the net cost to $17,000-19,000. In a state with no surviving incentives — Wyoming, West Virginia, Mississippi — the homeowner pays the full $24,000.

$24,000 ÷ $1,760 = 13.6 years. The same math with the 30% federal ITC included (had it survived): $24,000 - $7,200 = $16,800. $16,800 ÷ $1,760 = 9.5 years. The federal credit, while it existed, was cutting roughly 4 years off most state paybacks. That cut is now gone.

State-by-state payback ranges (2026 cash purchase)

These are 2026-04 estimates for an 8 kW system in median solar exposure. Real numbers vary with system size, self-consumption rate, and utility-specific net-metering structure.

Fast (8-12 years):

Hawaii — 8-10 years. $0.32/kWh electricity, $5,000 state income-tax credit.
Massachusetts — 9-12 years. $0.27/kWh, SMART tariff, state credit, active SREC market.
New Jersey — 9-12 years. $0.21/kWh, Successor Solar Incentive (SuSI), tax exemptions, active SRECs.
New York — 9-12 years. NY-Sun Megawatt Block, 25% state credit ($5,000 cap), NYSERDA storage rebate.

Moderate (11-15 years):

Illinois — 11-14 years. Illinois Shines / Adjustable Block Program plus active SREC market.
Maryland — 11-14 years. Energy Storage Tax Credit, state solar grant, active SRECs.
Oregon — 11-14 years. Energy Trust residential incentive, state solar+storage rebate.
Rhode Island, Vermont, Minnesota, Connecticut — 11-15 years. State programs vary; utility net-metering active.

Slow (12-18 years):

Texas — 12-16 years. $0.13/kWh, property-tax exemption, utility-specific rebates. Net-metering varies by utility.
Florida — 12-15 years. $0.14/kWh, full-retail net metering, sales/property tax exemptions, no state credit.
Arizona — 13-16 years. $0.13/kWh, APS avoided-cost crediting, no state credit. Sun helps; export rate doesn't.
Colorado, Nevada, Utah, New Mexico — 12-15 years. Modest state programs, moderate rates.
WY, MS, WV, ND, TN — 14-18+ years. No state programs, low rates, marginal even with full-retail net metering.

The two factors that flip a state from slow to fast

A state runs a fast residential solar payback when two conditions stack. First: high retail electricity rates ($0.18/kWh or higher). Every kWh the array offsets is worth more in a high-rate state than a low-rate state. Hawaii's $0.32/kWh is the extreme; Massachusetts at $0.27 and California at $0.30 (pre-CARE rate) are close behind. The South and Mountain West run $0.12-0.15/kWh — and at those rates, a kWh of solar production actually doesn't offset enough bill to pay back the panel quickly.

Second: an active SREC market or strong state income-tax credit. SRECs in New Jersey ($200-260 per certificate), Massachusetts ($230-280), Illinois ($50-75), and Maryland ($50-65) produce meaningful annual income on top of bill avoidance. State income-tax credits in New York ($5,000 cap), Hawaii ($5,000 cap), South Carolina (25% with $35,000 over 10 years), and New Mexico ($6,000 cap) reduce the install cost on the front end.

A state that has both — high electricity rates and a strong state program — runs a fast payback even without the federal credit. A state that has neither is on a 14-18 year timeline regardless of how good the panels are.

What changes the answer for a specific home

Self-consumption rate matters more than most homeowners expect. A home that consumes 75% of its solar production in real time does better in states with avoided-cost crediting and roughly the same in full-retail states. Time-of-use rates change the calculus further — if your utility charges $0.30/kWh during 4-9 PM and your array peaks at noon, batteries become an economic decision.

System size matters too. The right size for 2026 economics is the one that matches roughly 80-90% of annual consumption — not the 110% target some installers default to.

What this means for the buying decision

In a fast-payback state (HI, MA, NJ, NY), residential solar still works as a financial purchase post-ITC. In a moderate-payback state, it works for a homeowner planning to stay 12+ years. In a slow-payback state, it becomes a resilience or values purchase — payback is real but it's measured in 14-18 years, which is longer than the median homeownership tenure of 13 years.

Run your specific case. The Solar Reality Check tool prices the math by state, utility, system size, and self-consumption rate — without the expired federal credit baked in. For the broader post-ITC framing, see the solar hub. This is reference, not a quote.