Solar Payback Period Calculator 2026: How Long to Break Even

The solar payback period — how long until your system pays for itself — is the single most important number in the solar decision. It tells you whether solar is a good investment for your specific home, location, and financial situation.

The national average payback period in 2026 is 6–10 years, but that range masks enormous variation. A homeowner in Massachusetts paying $0.29/kWh could break even in 5 years. A homeowner in Louisiana paying $0.09/kWh might wait 14–16 years. This guide shows you exactly how to calculate your own number.

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What Is the Solar Payback Period?

The payback period is the time it takes for cumulative energy savings to equal the net cost of the solar system. After that point, every dollar of electricity savings is pure profit.

Simple formula:

Payback Period = Net System Cost ÷ Annual Savings

Where:

• Net System Cost = total installed price minus all incentives (federal credit, state credits, utility rebates)
• Annual Savings = annual kWh offset × your local electricity rate

This is the simple version. We'll also cover the more accurate "levelized" version that accounts for electricity rate inflation and system degradation.

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Step-by-Step: Calculate Your Payback Period

Step 1: Find Your Net System Cost

Start with the total installed price of your solar system. The national average in 2026 is $2.80–$3.20 per watt installed.

System Size	Gross Cost	After 30% ITC	After State Credits*
5 kW	$14,000–$16,000	$9,800–$11,200	$8,300–$9,700
7 kW	$19,600–$22,400	$13,720–$15,680	$11,720–$13,680
10 kW	$28,000–$32,000	$19,600–$22,400	$16,600–$19,400
12 kW	$33,600–$38,400	$23,520–$26,880	$20,020–$23,380

*State credits vary widely. This column assumes an average $1,500 combined state rebate — check your state in our state incentives guide.

The 30% federal Investment Tax Credit (ITC) is your biggest incentive. It applies to the full installed cost — panels, inverter, labor, and even electrical upgrades. See our ITC guide for eligibility details.

Step 2: Calculate Annual System Production

Your system's annual output depends on:

• System size (in kilowatts DC)
• Panel efficiency and tilt/orientation
• Local peak sun hours (varies significantly by region)

Rough formula:

Annual Output (kWh) = System Size (kW) × Peak Sun Hours × 365 × 0.80

The 0.80 factor accounts for real-world losses: inverter efficiency, wiring losses, temperature effects, and minor shading.

Peak sun hours by region:

Region	Peak Sun Hours/Day	Annual Output (7 kW System)
Southwest (AZ, NV, NM)	5.5–6.5	11,200–13,200 kWh
California	5.0–6.0	10,200–12,200 kWh
Southeast (FL, GA, SC)	4.5–5.5	9,200–11,200 kWh
Mid-Atlantic (VA, MD, NC)	4.0–5.0	8,200–10,200 kWh
Midwest (OH, IN, MI)	3.5–4.5	7,100–9,200 kWh
Pacific Northwest	3.0–4.0	6,100–8,200 kWh
New England	3.5–4.5	7,100–9,200 kWh

For a more precise number, use PVWatts (a free NREL tool) with your exact address.

Step 3: Calculate Annual Dollar Savings

Multiply your annual system output by your electricity rate:

Annual Savings = Annual Output (kWh) × Electricity Rate ($/kWh)

Current electricity rates by state (2026 averages):

State	Rate ($/kWh)	Annual Savings (9,000 kWh system)
Hawaii	$0.40	$3,600
California	$0.28	$2,520
Massachusetts	$0.29	$2,610
New York	$0.22	$1,980
Connecticut	$0.26	$2,340
Texas	$0.14	$1,260
Georgia	$0.13	$1,170
Louisiana	$0.09	$810
National Average	$0.17	$1,530

Important: If you have net metering, excess daytime production is credited at your full retail rate, and you draw from the grid at night using those credits. This is what makes the math above work cleanly. In states with degraded net metering (California under NEM 3.0, Hawaii), the effective rate you receive for excess solar may be as low as 5–8 cents/kWh — which significantly extends the payback period.

Step 4: Calculate Your Payback Period

Divide net cost by annual savings:

Example 1 — California homeowner:

• 8 kW system, gross cost $26,000
• After 30% ITC: $18,200
• Annual production: 10,000 kWh (5.4 peak sun hours × 0.80 efficiency × 365)
• Electricity rate: $0.28/kWh
• Annual savings: $2,800
• Payback period: $18,200 ÷ $2,800 = 6.5 years

Example 2 — Georgia homeowner:

• 8 kW system, gross cost $25,000
• After 30% ITC: $17,500
• Annual production: 9,200 kWh
• Electricity rate: $0.13/kWh
• Annual savings: $1,196
• Payback period: $17,500 ÷ $1,196 = 14.6 years

Example 3 — Massachusetts homeowner:

• 7 kW system, gross cost $22,000
• After 30% ITC + MA $1,000 state credit: $14,400
• Annual production: 8,400 kWh
• Electricity rate: $0.29/kWh
• Annual savings: $2,436
• Payback period: $14,400 ÷ $2,436 = 5.9 years

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The More Accurate Version: Inflation-Adjusted Payback

The simple payback formula treats your electricity savings as flat — the same dollar amount every year. In reality, electricity rates rise over time (historically 3–4% annually), which means your savings grow each year. This makes the true payback period shorter than the simple calculation suggests.

Inflation-adjusted payback formula:

Years = ln(1 + r × (Net Cost / Annual Savings₁)) / ln(1 + r)

Where:

• r = annual electricity rate inflation (use 0.035 for 3.5%)
• Annual Savings₁ = savings in year 1

Example with 3.5% electricity inflation:

Using the Georgia example above ($17,500 net cost, $1,196 year-1 savings):

• Simple payback: 14.6 years
• Inflation-adjusted payback: approximately 12.2 years

Using the California example ($18,200 net cost, $2,800 year-1 savings):

• Simple payback: 6.5 years
• Inflation-adjusted payback: approximately 6.1 years

The effect is larger for longer payback periods — exactly where you need the accuracy.

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Factors That Shorten Your Payback Period

1. High electricity rates The single biggest factor. A $0.01/kWh rate increase shortens the payback by 6–12 months for a typical system.

2. Generous state incentives States like New York (25% state credit up to $5,000, unique because it stacks on the full cost basis) and Massachusetts (15% credit + SMART performance payments at $0.15–$0.22/kWh for 10 years) can cut 2–3 years off the payback. New Jersey's SREC II program is particularly powerful — some NJ homeowners achieve sub-4-year paybacks. Connecticut's RSIP pays $0.20–$0.26/kWh on all production for 6 years on top of the 30% ITC — combined with CT's high electricity rates ($0.27–$0.31/kWh), Hartford and New Haven homeowners often see 3–5 year payback periods, among the fastest in New England. South Carolina's 25% state tax credit (up to $3,500/year, 10-year carry-forward) is the highest in the Southeast and produces 8–9 year payback periods in Charleston and Columbia. Illinois Shines and Colorado's Xcel Solar*Rewards are strong Midwest/Mountain West options. In the Pacific Northwest, Oregon's Energy Trust cash incentive plus RETC state credit cuts Portland payback periods to 8–9 years. Minnesota's Xcel Solar*Rewards PBI provides predictable 10-year production income. For Michigan homeowners, the DTE Solar Currents and Consumers Energy SolarCurrents programs add 10-year PBI payments on top of retail-rate net metering.

3. SREC income In states with Solar Renewable Energy Certificate markets (New Jersey, Massachusetts, Pennsylvania, Ohio), your system earns SRECs that you sell to utilities. NJ SRECs currently pay $185–270 each — a 7 kW system producing 8.5 MWh/year earns $1,575–$2,295/year in SREC income alone. Pennsylvania's AEC market pays $25–$50/MWh — meaningful but less than NJ/MD. Ohio's SREC market is nearly dormant ($5–$15/MWh), but Ohio's 100% property tax exemption for 15 years is worth $6,000–$8,000+ in high-rate counties. See our SREC guide for details.

Wisconsin's Focus on Energy program provides cash rebates of $500–$800 plus full property and sales tax exemptions — Milwaukee payback reaches 7 years despite lower sun hours. Indiana is a cautionary case: without a net metering mandate, export credits at $0.03–$0.06/kWh vs. retail $0.14–$0.16/kWh can extend payback to 13–16 years. Tennessee presents a similar challenge: the TVA Green Power Providers program pays only ~$0.048/kWh for exported solar (vs. $0.12/kWh retail), and adds a $15.64/month Power Service Connection fee that reduces net annual savings — producing 14–18 year paybacks without self-consumption optimization. In both Indiana and Tennessee, pairing solar with battery storage to maximize self-consumption is the key to a viable payback period. Kentucky buyers in the LG&E/KU/Duke territory (Louisville, Lexington, northern KY) have retail-rate net metering and see 14–16 year paybacks; eastern KY buyers in TVA territory face the same TVA GPP structure as Tennessee. Missouri offers retail-rate net metering protection (SB 564) with 12–13 year paybacks in Kansas City and St. Louis. Iowa has IUB-mandated retail net metering but low electricity rates ($0.12–$0.13/kWh) produce 12–16 year standard paybacks — though Energy Community counties and farm operations with REAP achieve 10–12 year periods. Nebraska offers retail-rate net metering through OPPD, NPPD, and LES, plus a 6-year property tax exemption and full sales tax exemption — producing 10–13 year paybacks in Omaha and Lincoln (quicker in Energy Community counties with the 40% ITC, or on farms with REAP grants). Kansas has excellent sun (Wichita 5.3 peak sun hours/day) and Evergy retail-rate net metering, but no state credit, no property tax exemption, and no sales tax exemption — producing 10–13 year standard paybacks; Energy Community locations in Cherokee, Crawford, and Montgomery counties shorten this to ~11 years with the 40% ITC, and farm operators with USDA REAP grants can achieve 5–7 year paybacks.

Across the Northeast, Rhode Island is one of the strongest markets in New England: National Grid's high rates ($0.22–$0.27/kWh), the Renewable Energy Fund upfront rebate ($0.20–$0.35/W), and full property and 7% sales tax exemptions produce payback periods of 5.5–8 years in Providence, Warwick, and Newport — competitive with Connecticut's 3–5 year periods and Massachusetts' 5–9 year range. New Hampshire offers no state sales tax (saves $1,500–$3,000 automatically), NHPUC-mandated retail net metering, and Eversource rates averaging $0.26–$0.28/kWh — producing 8–10 year paybacks in Manchester and Concord, with Portsmouth's higher rates pushing payback down to 6.7–7.4 years. Vermont completes New England coverage: high Green Mountain Power rates ($0.21–$0.25/kWh) offset lower sun hours (4.2–4.9 peak/day) to produce 10–14 year paybacks; the property tax exemption (32 V.S.A. § 3845) and Efficiency Vermont rebates ($400–$750 standard, up to $1,500+ with battery) improve the economics further — though the absence of a sales tax exemption and state income credit are notable gaps vs. NH, RI, and CT. Delaware benefits from no state sales tax (0% — one of only five states), DNREC's Green Energy Program rebate ($0.25/W up to $2,500), and SREC income through PJM-GATS, producing 10–14 year payback periods in Wilmington and Dover; the income-qualified enhanced rebate ($0.50/W up to $5,000) can shorten this significantly for qualifying households. In the Southwest, New Mexico stands out with a 10% state income tax credit (SMDTC, max $6,000) stacking with the 30% federal ITC (or 40% Energy Community rate in San Juan County and Permian Basin counties), plus a full GRT exemption — producing ~8-year paybacks in Albuquerque (PNM, 6.2 peak sun hours/day) and ~7.5-year paybacks for Energy Community buyers in Las Cruces (EPE territory, 6.5 peak sun hours/day).

Hawaii is the most financially compelling solar market in the U.S. by electricity rate alone — residential rates average $0.40–$0.46/kWh on Oahu and $0.47–$0.55/kWh on the Big Island and Maui. The 35% state income tax credit (HRS § 235-12.5, capped at $5,000 per residential system) stacks independently with the 30% federal ITC, covering nearly half the system cost in credits. Battery storage is effectively required because Hawaii's Smart Export tariff ($0.14–$0.20/kWh) is only 35–45% of the retail rate — self-consumed solar is worth 2–3× exported solar. A 9 kW solar + 13.5 kWh battery system in Honolulu achieves ~$22,300 effective cost after both credits and a 6.3-year payback at 90% self-sufficiency; Big Island and Maui buyers with larger systems and two batteries can achieve 5.7–6 year paybacks — competitive with Connecticut and Massachusetts despite significantly higher system costs.

In the Mountain West, Utah combines a 25% state income tax credit ($1,600 cap), 6.1% sales tax exemption, and Rocky Mountain Power retail-rate net metering to produce 10-year paybacks in Salt Lake City; Carbon and Emery County Energy Community buyers hit 8-year paybacks with the 40% ITC. St. George (6.0–6.5 peak sun hours/day) has among the best sun resource in the continental U.S. Idaho offers good sun in the south (Boise: 4.8–5.3 peak sun hours/day) and PUC-mandated retail-rate net metering for Idaho Power and Avista customers, but no state credits and low rates ($0.09–$0.11/kWh) produce 14–16 year paybacks for right-sized Boise systems; Energy Community buyers (Minidoka, Butte, Power counties) improve to 12 years with the 40% ITC. The critical Idaho nuance: annual October true-up pays avoided cost ($0.024–$0.040/kWh) on surplus — don't oversize. Montana has no state sales tax (saves $1,500–$3,000 automatically) and a 10-year property tax exemption under MCA 15-6-225, but NorthWestern Energy's low rates ($0.09–$0.11/kWh) mean standard payback periods of 13–15 years in Missoula and Helena. Billings' stronger sun resource (5.3 peak sun hours/day) improves this to ~12.7 years; Energy Community buyers in Rosebud County/Colstrip area hit ~11 years with the 40% ITC. Wyoming has excellent sun (Casper: 5.5 peak sun hours/day) but no state credits, no property tax exemption, and Rocky Mountain Power rates of ~$0.10–$0.12/kWh extend standard payback to 13–15 years; Campbell County Energy Community buyers (Gillette coal area) achieve ~10–11 years with the 40% ITC, and ranchers using USDA REAP achieve 4–6 year farm paybacks. Oklahoma offers OCC-mandated retail-rate net metering for OG&E and PSO customers, a state sales tax exemption on equipment, and 5.0–5.5 peak sun hours/day in the OKC and Tulsa metros — but no state income tax credit and no blanket property tax exemption. Standard OG&E buyers (9 kW, 30% ITC) achieve ~13 year paybacks; Energy Community buyers in Muskogee, Pittsburg, Coal, and LeFlore counties improve to ~11 years with the 40% ITC. Rural co-op customers need to confirm net metering policies before purchasing — co-ops are NOT subject to OCC's net metering mandate. In the Northern Plains, North Dakota has a 5-year property tax exemption and Xcel/MDU retail-rate net metering but very low rates ($0.10–$0.13/kWh) produce 12–16 year standard paybacks; Oliver, McLean, and Mercer County Energy Community buyers (coal plant communities) improve to ~10–12 years, and ND farms with USDA REAP achieve 3–4 year paybacks. South Dakota has a 3-year property tax exemption and retail-rate net metering from Black Hills Power and Xcel, plus Rapid City's outstanding 5.5 peak sun hours/day (one of the best in the Great Plains) — producing ~10.9–11 year paybacks in western SD vs. ~13–14 years in Sioux Falls; Lawrence County Energy Community buyers hit ~9.6 years. Maine is the Northeast's standout value: CMP rates of $0.22–$0.28/kWh plus Efficiency Maine's $450/kW cash rebate, full 5.5% sales tax exemption, and 100% property tax exemption drive 4–6 year paybacks in Portland and Bangor — among the fastest in New England. Income-qualified households with $800/kW EMT rebates achieve under-4-year paybacks. Alaska presents two scenarios: Anchorage (Chugach Electric, ~$0.23/kWh) sees ~7.2 year payback after the 30% ITC — solid economics for a northern latitude; rural Alaska diesel communities ($0.40–$2.00+/kWh) see 3–4 year paybacks replacing diesel with solar + battery — the best solar ROI anywhere in the country.

In the Southeast, Louisiana sits at a mid-tier level: Entergy Louisiana and CLECO offer retail-rate net metering (better than its neighbors MS and AL), a 50% property tax exemption for 10 years helps offset costs, and Energy Community 40% ITC in Calcasieu/St. Mary/Terrebonne parishes reduces net cost further. New Orleans homeowners see 10–12 year paybacks; Lake Charles Energy Community buyers achieve 11 years with the 40% ITC. Arkansas offers better-than-average Mid-South economics: APSC retail-rate net metering (Entergy Arkansas and OG&E), a 6.5% sales tax exemption, and a 6-year property tax exemption combine for 11–15 year paybacks in Little Rock/Fayetteville; Fort Smith/Sebastian County Energy Community buyers with the 40% ITC achieve 8–10 year paybacks — competitive with many national markets. About one-third of Arkansas customers are served by rural cooperatives with variable policies; call your co-op before signing. West Virginia is the most distinctive Appalachian case: challenging baseline (no state credits, no tax exemptions, low rates, modest sun), but Energy Community 40% ITC applies to the vast majority of WV counties. Charleston and Beckley buyers with Energy Community ITC achieve 8–9 year paybacks with 4% rate inflation; standard 30% ITC buyers in Morgantown face 12–15 years. Mississippi and Alabama are the most challenging solar markets in the region: Entergy Mississippi and Alabama Power both use avoided-cost export rates ($0.04–$0.06/kWh vs. retail $0.11–$0.13/kWh), requiring self-consumption optimization and producing 14–18 year standard paybacks. Mississippi's Alcorn/Tishomingo/Monroe/Warren county Energy Community buyers improve to 12–15 years with the 40% ITC. Alabama's Jefferson/Walker/Etowah county Energy Community buyers with the 40% ITC improve to 11–13 years. Georgia homeowners (Georgia Power retail net metering ≤10 kW) see 8–14 year paybacks depending on system size and usage. North Carolina — the #3 U.S. solar market — produces 9–11 year paybacks under HB 589-protected Duke Energy net metering. Virginia buyers benefit from VCEA-protected Dominion Energy net metering and a 100% property tax exclusion, yielding 10–11 year paybacks in Northern Virginia and Richmond. Maryland is among the fastest-payback states on the East Coast — the active SREC market ($60–$90/MWh) combined with BGE's high rates produces 6-year paybacks in Baltimore. Washington State offers full sales tax exemption and retail-rate net metering, but low electricity rates ($0.10–$0.11/kWh) produce 10–12 year paybacks in Seattle; Spokane's sunnier Eastern WA climate improves this to 9–10 years. Georgia homeowners (Georgia Power retail net metering ≤10 kW) see 8–14 year paybacks depending on system size and usage. North Carolina — the #3 U.S. solar market — produces 9–11 year paybacks under HB 589-protected Duke Energy net metering. Virginia buyers benefit from VCEA-protected Dominion Energy net metering and a 100% property tax exclusion, yielding 10–11 year paybacks in Northern Virginia and Richmond. Maryland is among the fastest-payback states on the East Coast — the active SREC market ($60–$90/MWh) combined with BGE's high rates produces 6-year paybacks in Baltimore. Washington State offers full sales tax exemption and retail-rate net metering, but low electricity rates ($0.10–$0.11/kWh) produce 10–12 year paybacks in Seattle; Spokane's sunnier Eastern WA climate improves this to 9–10 years.

4. Time-of-use rate optimization If your utility has time-of-use (TOU) rates with higher prices during peak afternoon hours, your solar production coincides with those expensive hours. With smart battery management, you can shift consumption to off-peak times and maximize savings. See our TOU and solar guide.

5. Avoiding installers with excessive markups Installation quotes vary 20–40% for identical systems. Getting 3+ competitive quotes and knowing the market price per watt ($2.80–$3.20 for a quality system) ensures you're not overpaying. Our installation cost guide shows what line items should cost.

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Factors That Lengthen Your Payback Period

1. Low electricity rates States with cheap grid power (Louisiana, Idaho, Washington) have payback periods that can stretch 14–18 years. Solar still makes physical sense, but the financial case weakens.

2. Degraded net metering California's NEM 3.0 (implemented 2023) cut the value of excess solar exports from retail rate to ~5–8 cents/kWh. Effective payback periods in California for grid-tied systems without battery roughly doubled overnight. Battery storage restores much of the economics by self-consuming solar instead of exporting it.

3. Roof issues requiring replacement If you need to reroof before installation, add that cost to your net system cost. A $12,000 reroof effectively adds 5–7 years to the payback.

4. High-rate solar loans At 9.99% APR (rates offered by many door-to-door solar sales companies), the total loan cost over 20 years can exceed the electricity savings. Always understand the all-in loan cost before signing. Cash purchases or low-rate solar loans (under 7%) produce dramatically better economics.

5. Shading issues A system that's 25% shaded has a proportionally longer payback period. Installers should address shading with optimizers or microinverters, but shaded production is still lost production.

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Payback Period vs. Lifetime ROI

The payback period tells you when you break even, but it doesn't tell you the full picture. A system with an 8-year payback that produces for 30 years generates 22 more years of profit. The lifetime ROI often exceeds 300%.

Lifetime savings example (7 kW system, 8-year payback, 3.5% rate inflation):

Year	Annual Savings	Cumulative Savings	Net Position
1	$1,800	$1,800	-$16,200
5	$2,130	$9,900	-$8,100
8	$2,340	$17,900	Break-even
10	$2,560	$23,400	+$5,400
15	$3,040	$37,800	+$19,800
20	$3,610	$54,500	+$36,500
25	$4,290	$75,000	+$57,000

That $57,000 in lifetime savings (net of system cost) represents a strong return on an $18,000 net investment — especially when combined with the ~$28,000 home value increase from the installation.

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What's a Good Payback Period?

There's no universal answer, but here's a practical framework:

Payback Period	Assessment
Under 6 years	Excellent — strong financial case, proceed
6–9 years	Good — solid investment, typical for well-sunny states
9–12 years	Fair — still positive ROI over system life, worth doing if planning to stay
12–15 years	Marginal — depends on rate inflation; consider carefully
Over 15 years	Weak — high rates or low electricity costs; may not justify the investment

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How to Use This Information to Get Better Quotes

Armed with your calculated payback period estimate, you're better positioned to evaluate installer quotes:

1. Calculate your target net cost — based on your annual savings and target payback period
2. Get 3 quotes minimum — and have all three quote the same system size
3. Compare cost per watt — should be $2.80–$3.20 for a quality system
4. Ask about monitoring — a good solar monitoring system lets you track actual vs. expected output
5. Read our installer selection guide — see best solar companies 2026 for red flags and what to look for

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Payback Period Calculator: Your Numbers

Use this worksheet:

1. Gross system cost:              $________
2. Federal ITC (line 1 × 0.30):   -$________
3. State/local incentives:         -$________
4. Net system cost (1-2-3):        $________

5. System size (kW):               ________
6. Peak sun hours (from table):    ________
7. Annual production (5×6×365×0.8): ________ kWh
8. Electricity rate ($/kWh):       $________
9. Annual savings (7×8):           $________

10. Simple payback (4÷9):          ________ years

If your payback comes out under 10 years, solar is likely a strong financial decision for your situation. If it's over 12 years, examine whether there are incentives you're missing or whether a smaller system would improve the economics.

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Bottom Line

The average solar payback period in 2026 is 6–10 years for most U.S. homeowners — short enough that the typical homeowner who stays put for 10+ years makes a clear financial win. The 30% federal tax credit is the single biggest lever; states with strong additional incentives (Massachusetts, New York, New Jersey) can see paybacks under 6 years.

The biggest wildcards are your local electricity rate and whether your state has degraded net metering. Run the numbers above for your specific situation — the 15 minutes it takes could save you (or confirm you'll save) tens of thousands of dollars.

Next step: use our solar installation cost guide to sanity-check installer quotes, our how many solar panels guide to determine the right system size, and our solar vs. grid electricity cost comparison for a 25-year total cost analysis against staying on grid power. To benchmark your state against all others — payback, 25-year savings, and IRR in one table — see the solar ROI by state comparison guide.

When you're ready to compare proposals, our solar quote comparison guide walks through cost-per-watt benchmarks, equipment tiers, financing red flags, and negotiation tactics. Before collecting quotes, read our how to save money on solar installation 2026 guide — strategies like avoiding dealer fees on loans, shopping off-season, and right-sizing your system can save $3,000–$12,000 off typical installation costs. For farms and rural businesses, our USDA REAP solar grant guide shows how REAP grants (up to 50% of project cost) can compress payback periods to 2–4 years when stacked with the ITC. Business owners should also read our Solar for Small Businesses 2026 guide — the combination of Section 48 ITC and 40% bonus depreciation can return 40–50% of system cost in year one, changing the payback calculation fundamentally.

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Calculations based on 2026 market pricing and incentive levels. Electricity rates, incentive programs, and installer pricing change frequently. Always verify current incentive values and get multiple quotes before committing to a system.