US Solar Payback by State Calculator

Compare solar payback periods across all 50 states. Enter your state and system size — see incentives, SREC income, and how your state ranks nationally.

Your solar details

State?

System size?

Current monthly electricity bill?

$/mo

Solar payback in California

5.8-year payback — #7 of 50 states

Annual solar production11,446 kWh/yr

Annual electricity savings$2,160/yr

Gross system cost (7 kW)$19,600

Federal ITC (30%)-$5,880

Sales tax exemption (~6%)-$1,176

Effective cost (after incentives)$12,544

vs. national avg (8.7 yrs)2.9 yrs faster

Property tax exemptYes — system value excluded

Top 5 states for solar payback

#1 Massachusetts2.6 yrs

#2 New York3.3 yrs

#3 New Jersey3.5 yrs

#4 Hawaii4.0 yrs

#5 Rhode Island4.9 yrs

Bottom 5 states for solar payback

#50 Washington17.0 yrs

#49 Oregon14.6 yrs

#48 North Dakota14.2 yrs

#47 Louisiana14.1 yrs

#46 Kentucky13.9 yrs

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Extended AnalysisState rankings, incentive details & side-by-side comparison

Federal ITC rate ?

Top 10 fastest payback states for an 8 kW system (30% ITC). Rankings driven by electricity rate, SREC income, and state incentives — not just sunshine.

Massachusetts

3yr

Hawaii

3yr

New Jersey

4yr

New York

5yr

California

5yr

Connecticut

6yr

Rhode Island

6yr

Illinois

6yr

Maryland

7yr

Arizona

7yr

Under 8 years8-14 yearsOver 14 years

How to Use This Calculator

Select your state and enter system details

Choose your state from the dropdown — each state is pre-loaded with its average electricity rate (¢/kWh), average peak sun hours, state tax credit amount, SREC value per MWh, and whether the state offers property tax and sales tax exemptions. Enter your planned system size in kW and your current monthly electricity bill.

Understanding the incentive breakdown

The calculator shows every incentive layer: the federal Investment Tax Credit (30% of system cost through 2032), state tax credits where applicable, sales tax exemptions (saves 5-7% upfront), SREC annual income where markets exist, and property tax exemption status. The effective cost after all incentives is what your real payback calculation is based on.

Reading state rankings

Your state is ranked #1-50 for payback period given your system size and monthly bill. States rank better when they combine high electricity rates, good sun, and strong incentive programs — not any single factor alone. The calculator also shows which states beat the 8.7-year national average and which fall behind.

The Formula

Annual kWh = System kW × 1000 × PSH × 365 × 0.80 efficiency Annual Savings = Monthly Bill × 12 × min(1, Annual kWh ÷ Annual Home kWh) Gross Cost = System kW × 1000 × $2.80/W (national avg install cost) Federal ITC = Gross Cost × 30% Sales Tax Savings = Gross Cost × 6% (if state-exempt) SREC Income = Annual kWh ÷ 1000 × SREC $/MWh Effective Cost = Gross Cost − ITC − State Credit − Sales Tax Savings Payback (yrs) = Effective Cost ÷ (Annual Savings + SREC Income)

The 30% federal ITC is applied as a dollar-for-dollar tax credit on your federal income tax return — not a deduction. You must have sufficient tax liability to claim it (or carry it forward). Sales tax exemptions apply at purchase time. SREC (Solar Renewable Energy Certificate) income is earned by selling certificates representing each MWh your system generates to utilities required to source renewable energy.

Example

David — 8 kW system in Massachusetts

David in Massachusetts is considering an 8 kW solar system. His monthly electricity bill is $190 at $0.235/kWh. Massachusetts has a strong SREC market at $280/MWh and a $1,000 state tax credit.

StateMassachusetts (4.2 PSH, $0.235/kWh)

System size8 kW

Monthly bill$190/mo

Result

Annual solar production~9,830 kWh/yr

Annual savings~$2,280/yr

SREC income~$2,752/yr (9.83 MWh × $280)

Gross system cost$22,400

Federal ITC (30%)-$6,720

State tax credit-$1,000

Sales tax exemption-$1,344

Effective cost$13,336

Payback period~2.7 years

Massachusetts's lucrative SREC market (one of the highest-value in the US) transforms the economics dramatically. David earns more from selling SRECs than from electricity savings alone — giving him one of the fastest paybacks in the country despite moderate sunshine. Massachusetts frequently ranks in the top 5 states for solar return on investment.

FAQ

Which states have the best solar payback? ▼

The best payback states combine high electricity rates, good incentives, and reasonable sun. Massachusetts consistently ranks #1-3 due to high rates and valuable SREC income. New Jersey has the strongest SREC market in the US. Hawaii has the highest electricity rates in the country ($0.38+/kWh) — solar saves more per kWh than anywhere else. New York combines high rates, a $5,000 state credit, and sales tax exemption. California benefits from high rates and strong net metering (though evolving policy has reduced some benefits). Interestingly, sunny Arizona and Nevada rank lower because their rates are relatively low.

What is the federal solar tax credit and how does it work? ▼

The federal Investment Tax Credit (ITC) gives you a 30% credit on your federal income taxes equal to 30% of the total system cost including installation. It's a dollar-for-dollar reduction in taxes owed — not a deduction. For a $20,000 system, you receive a $6,000 credit. You must have at least $6,000 in federal tax liability to use the full credit in one year; any unused portion carries forward to future tax years. The 30% rate applies through 2032, drops to 26% in 2033, and 22% in 2034. Battery storage installed with solar also qualifies.

What are SRECs and which states have them? ▼

Solar Renewable Energy Certificates (SRECs) represent 1 megawatt-hour (MWh) of solar electricity generated. Utilities in states with Renewable Portfolio Standards must buy a certain percentage of power from solar and purchase SRECs from solar owners to comply. An 8 kW system generates about 9-10 SRECs per year in a moderate-sun state. SREC prices vary dramatically: New Jersey leads at ~$220+/MWh, Massachusetts ~$280/MWh (historically), Illinois ~$75/MWh, Maryland ~$60/MWh. States without SREC programs include Texas, Florida, California, and most Sun Belt states. SREC income is taxable.

Does more sunshine always mean a better solar investment? ▼

Not necessarily — and this is the most counterintuitive solar finance insight. States like Arizona (6.5 PSH) and Nevada (6.0 PSH) have excellent sun but low electricity rates ($0.10-0.13/kWh), which limits savings per kWh generated. Massachusetts (4.2 PSH) generates less solar power but saves much more per kWh ($0.235/kWh) plus earns SREC income — giving it a faster payback than Arizona. The formula is: Rate × kWh savings + incentives determines ROI, not sun alone. New England states consistently outperform Sun Belt states on payback despite far less sunshine.

How does property tax exemption affect solar value? ▼

Solar systems add value to your home — typically $4-6 per watt of installed capacity. In states without property tax exemption, that increased home value raises your annual property tax bill. In states with solar property tax exemption (currently 25+ states including California, Texas, New York, Florida, and Massachusetts), the solar system's added value is excluded from property tax assessment — saving $100-400+ per year depending on local tax rates. This improves both the financial returns and your effective payback period.

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