Solar Panel Payback USA 2026: After NEM 3.0 + No ITC

Published 13 May 2026 · 13 min read

You have a proposal sitting on the kitchen table. It is from 2024 or early 2025. It says something like "$24,000 system, $7,200 federal tax credit, payback in seven years." It is a confident-looking spreadsheet from a confident-looking installer.

Two things have happened since that proposal was printed. California finished phasing in NEM 3.0 (now formally the Net Billing Tariff), which cut export rates by roughly 75%. And on 4 July 2025, the One Big Beautiful Bill Act (OBBBA) terminated the Section 25D Residential Clean Energy Credit for any expenditure made after 31 December 2025. The 30% federal credit that has anchored every US solar quote for the last decade is, for new residential installs in 2026, zero.

If you are buying solar this year, the numbers on that 2024 spreadsheet are wrong. Sometimes by a lot. This guide walks three worked scenarios — California without a battery, California with a Powerwall 3, and Massachusetts — so you know what you are actually looking at before you sign.

TL;DR — three 2026 payback numbers

  • California, 8 kW, no battery, NEM 3.0: roughly 15–18 years. The math has gone from "fine" to "borderline" because exports are worth a fraction of retail and the 30% credit is gone.
  • California, 8 kW + Powerwall 3, NEM 3.0: roughly 9–11 years. The battery captures self-consumption value the bare panels cannot. This is the only California configuration that still pencils sensibly.
  • Massachusetts, 7 kW, SMART 3.0 + net metering: roughly 8–10 years. State programs outside CA still work; SMART pays a flat $0.03/kWh for 20 years on top of net metering.

Detail and arithmetic below.

The 2026 elephant — Section 25D is gone

For the last fifteen years, every US residential solar pitch has assumed a 30% federal tax credit on the installed price. It is the single biggest line item on most payback spreadsheets.

OBBBA, signed into law on 4 July 2025, terminated the credit. The IRS confirmed the position in its FAQ document on the §25C, §25D, §25E, §30C, §30D, §45L, §45W and §179D modifications: an expenditure made after 31 December 2025 is treated as made after that date, and the §25D credit is not available. There is no phase-down. There is no partial credit. There is no successor.

Two practical consequences:

  1. Systems placed in service in 2025 still qualify, claimed on the 2025 tax return. If your installer has you in the ground and powered on before 31 December 2025, you get the credit. After that date, you do not — even if you paid a deposit in 2025.
  2. Section 48E (commercial) is a different statute and is still alive with its own phase-down. This is why some installers are now pitching third-party-owned (TPO) leases and PPAs — the lessor claims 48E and passes some of the value back through the lease rate. That is a separate product with its own trade-offs (you do not own the panels, you have a 20–25 year contract, the resale-of-home conversation gets more complicated). It is not the same as owning your own system.

For everyone reading this guide who is considering buying a system outright in 2026: assume zero federal credit in your math. If your installer is still showing 30% on the spreadsheet, ask them to redo it.

Scenario A — California, 8 kW, no battery, NEM 3.0

The hard case. NEM 3.0 (Net Billing Tariff) replaced retail-rate net metering for new interconnections in April 2023. Exports are now paid at avoided-cost rates that average $0.05–$0.08/kWh across the year, against retail rates that hit $0.45/kWh on PG&E summer peak. The 75% gap between buy-price and sell-price means a panel-only system in California now lives or dies by how much of its own generation the household consumes in real time.

The numbers:

  • System: 8 kW, installed price $22,000 (EnergySage 2026 average runs around $2.58/W nationally; California sits a touch above)
  • Federal ITC: $0 (post-OBBBA)
  • California state rebate: $0 for panels alone (SGIP is battery-only)
  • Net installed cost: $22,000
  • Annual generation (Los Angeles, PVWatts, 4° tilt, south): ~12,000 kWh/yr
  • Realistic self-consumption without a battery: ~35% of generation = 4,200 kWh offsetting retail
  • Exported to grid: ~7,800 kWh at ~$0.06/kWh average NBT export rate
  • Annual benefit: (4,200 × $0.35 retail avg) + (7,800 × $0.06) = $1,470 + $468 = ~$1,940
  • Simple payback: $22,000 ÷ $1,940 = ~11.3 years on paper, 15–18 years realistic once you account for inverter replacement around year 12, panel degradation, and a more honest self-consumption number for a household that is out at work daily

This is the scenario where a homeowner reads a 2024 quote, sees "seven year payback", and discovers in 2026 that the underlying assumptions — 30% federal credit, retail-rate exports — have both been deleted.

Scenario B — California, 8 kW + Powerwall 3

The battery changes the calculation completely. Under NEM 3.0 the high-value action is not exporting — every kWh you can keep on your side of the meter is worth $0.35–$0.45 retail rather than $0.06 export. A battery lets you store midday solar and discharge it across the 4pm–9pm peak, when grid power is most expensive and your panels are not producing.

The numbers:

  • System: 8 kW solar + Powerwall 3 (13.5 kWh), installed price $35,000 ($22,000 panels + $13,000 battery installed)
  • Federal ITC: $0
  • SGIP (California Self-Generation Incentive Program) battery rebate, General Market tier: ~$2,000 (roughly $150/kWh × 13.5 kWh, eligibility depending)
  • Net installed cost: ~$33,000
  • Annual generation: ~12,000 kWh
  • With battery, realistic self-consumption rises to ~75% = 9,000 kWh offsetting retail
  • Exported: ~3,000 kWh at $0.06 = $180
  • Annual benefit: (9,000 × $0.35) + $180 = ~$3,330
  • Simple payback: $33,000 ÷ $3,330 = ~10 years, with the battery doing most of the work

The Powerwall has not made solar cheaper. It has made solar monetisable under a tariff structure that punishes exports. If you are buying panels in California in 2026 without a battery, the question to ask the installer is not "what is the payback?" — it is "why am I buying panels without a battery?"

Scenario C — Massachusetts, 7 kW, SMART 3.0

Outside California, things look very different. Massachusetts still operates traditional net metering — you bank exports at retail rate against your bill — and layers the SMART program on top. SMART 3.0 (the current iteration) pays a flat $0.03/kWh on every kWh generated for 20 years, with adders for storage and low-income participation that can push it to $0.06/kWh.

The numbers:

  • System: 7 kW, installed price $19,000 (Massachusetts pricing runs slightly above the EnergySage national $2.58/W average)
  • Federal ITC: $0
  • Massachusetts state income tax credit: $1,000 (15% of system cost capped at $1,000)
  • Net installed cost: ~$18,000
  • Annual generation (Boston, PVWatts): ~9,100 kWh/yr at ~1,300 kWh/kWp
  • Bill offset via net metering at Eversource ~$0.32/kWh: 9,100 × $0.32 = $2,912
  • SMART 3.0 incentive: 9,100 × $0.03 = $273/yr for 20 years
  • Annual benefit (years 1–20): ~$3,185
  • Simple payback: $18,000 ÷ $3,185 = ~5.6 years on paper, 8–10 years realistic

This is the best mainstream US case in 2026. Retail-rate net metering plus a state-level production incentive plus a state tax credit roughly substitute for the federal credit. Connecticut, Rhode Island, New Jersey and New York operate variants of the same model — different acronyms, similar maths.

For reference, NY-Sun pays residential incentives in the $0.20–$0.40/W range depending on utility territory and current megawatt block, on top of New York's 25% state tax credit (capped at $5,000). The exact NY number depends heavily on whether you are in ConEd / PSEG territory (lower blocks) or upstate (higher blocks).

California's NEM 3.0 dilemma

There is a recurring conversation in California right now between homeowners who bought solar under NEM 2.0 (retail-rate exports, locked in for 20 years on their original interconnection) and homeowners getting quotes today. The 2.0 systems still pay back in 5–7 years. The 2026 quotes do not. Same panels, same roof, same sunshine — different tariff regime, different tax credit regime, different answer.

The structural takeaway: in California, a 2026 solar-only system is a worse investment than a 2026 solar + battery system, despite costing less up-front. This inverts the intuitive ranking most homeowners arrive with. If your budget does not stretch to a battery, the honest answer in California today is often "wait, or do a smaller panel array sized to your daytime baseline load, and revisit a battery in a few years."

State programs that still work in 2026

  • Massachusetts SMART 3.0 — $0.03/kWh for 20 years, plus storage and low-income adders up to $0.06/kWh, plus retail-rate net metering. Reviewed annually.
  • NY-Sun — declining-block residential rebate $0.20–$0.40/W depending on utility territory. Plus a 25% NY state income tax credit capped at $5,000.
  • California SGIP — battery-only, ~$150/kWh General Market tier, higher tiers for equity / fire-risk territories. Does not apply to panels.
  • Maryland Residential Clean Energy Grant — $1,000 flat grant for residential systems up to 20 kW.
  • Connecticut, New Jersey, Rhode Island — variants of net metering + production-based incentives, broadly comparable to MA in outcome.
  • Texas, Florida, most of the South — no statewide solar program. Payback in these states depends almost entirely on retail rate, local utility net-metering policy (which varies wildly), and whether you have a TOU plan to optimise against. Texas residential payback in 2026 without a strong utility rebate runs 12–18 years.

What is not in the payback number

Three things commonly missed:

  • Home value uplift. Lawrence Berkeley National Lab's research consistently finds that owned (not leased) solar adds value at resale, on average around $10,000 for an 8 kW system, though the spread is wide. This is real but is not "payback" — you only realise it when you sell.
  • Grid resilience. Only meaningful if you have a battery with backup-capable wiring. Panels alone shut off when the grid goes down. If you are in a wildfire PSPS zone or hurricane country, a battery's outage value is genuine but not easily monetised.
  • The feel-good factor. A real consideration for some buyers, but please do not let an installer trade it in as a financial line item.

What kills payback

  • High installer markup. Door-to-door pitches and the larger national chains routinely quote 30–50% above EnergySage marketplace average. Get three quotes. The price spread on the same 8 kW system in the same zip code is often $8,000+.
  • Oversized systems. Salespeople are paid on system size. In NEM 3.0 California particularly, oversizing destroys payback because the marginal kWh is exported at $0.06 not consumed at $0.35.
  • Bad roof orientation. A north-facing or heavily shaded array can lose 30%+ of nameplate generation. PVWatts is your friend here — run your own numbers before trusting an installer's annual yield figure.
  • No TOU enrollment. In California, panels make no sense without time-of-use billing. Confirm with your utility that you are on the right rate plan before commissioning.
  • TPO confusion. Leases and PPAs are not the same as ownership and have very different long-term economics. Make sure you know which product you are signing.

Verdict

US residential solar in 2026 is materially harder to make pencil than it was in 2025. The combination of NEM 3.0 in California and Section 25D termination nationally has knocked roughly 30–40% off the financial case for an unattended panel-only install.

In California, the only configuration that still pays back on a sensible horizon is solar paired with a battery. In Massachusetts, New York and the broader Northeast, state-level programs (SMART 3.0, NY-Sun, state income tax credits) substantially compensate for the lost federal credit and traditional net metering still works in your favour. In Texas, Florida and most of the South, payback now depends almost entirely on retail electricity rates and a TOU plan you can optimise against.

If you are sitting on a 2024 or 2025 quote that has not been redone for the post-OBBBA, post-NEM-3.0 world: take it back to the installer and ask for honest 2026 numbers. If the spreadsheet still has a 30% federal credit line, walk away.

Further reading

FAQs

Is the federal solar tax credit really gone in 2026? For new residential installs, yes. The §25D Residential Clean Energy Credit was terminated by the One Big Beautiful Bill Act for expenditures made after 31 December 2025. Systems placed in service during 2025 still qualify on the 2025 tax return. There is no phase-down and no successor for residential.

Can I still claim the credit if I signed a contract in 2025 but install in 2026? The IRS guidance is clear that an expenditure made after 31 December 2025 is treated as made after that date — installation must be completed in 2025 to qualify. A 2025 deposit on a 2026 install does not count.

Does the lease / PPA route still capture the credit? A third-party owner can claim §48E (the commercial investment tax credit, which has a different phase-down schedule). Some of that value is passed to the homeowner through the lease rate. It is not the same as you owning the credit and the long-term economics differ — read the contract carefully.

Is solar still worth it in California in 2026? With a battery, on a TOU plan, with a reasonable quote: yes, around 9–11 year payback. Without a battery, in 2026 California, the math is hard. Many installers will quote you a panel-only system; that does not mean it is the right product.

What is NEM 3.0 in one sentence? Net Billing Tariff — California's replacement for retail-rate net metering, in which solar exports are paid at hourly avoided-cost rates averaging $0.05–$0.08/kWh, against retail rates of $0.30–$0.45/kWh, making self-consumption (via a battery or daytime loads) the high-value play.