Question 1

What happened to the §25D federal solar tax credit?

Accepted Answer

The residential clean energy credit under IRC §25D — the 30% federal tax credit that covered residential solar panel installations — expired on December 31, 2025. The One Big Beautiful Bill Act (OBBBA) did not extend §25D for new residential installations. This is a material change from the prior law (the Inflation Reduction Act of 2022, which had extended §25D through 2034 before OBBBA modified it). For homeowners installing solar in 2026 and beyond, the §25D credit is no longer available on new systems. The credit that remains in federal law is IRC §48E, the Clean Electricity Investment Credit. However, §48E is a commercial and industrial credit, not a residential one — it applies to eligible solar projects with a prevailing-wage and apprenticeship requirement, standalone battery storage systems of 3 kWh or more in a commercial context, and certain utility-scale installations. Residential homeowners do not directly access §48E through their personal income tax return in the way they accessed §25D. If you're evaluating a community solar subscription, a commercial installation on a business property, or a battery-plus-solar system structured through a commercial entity, §48E may be relevant. Consult a licensed CPA or Enrolled Agent who specializes in energy tax credits for your specific situation. Per the IRS FAQS on Energy Credits Online (IRS.gov, 2025): the §25D credit is 'not available for systems placed in service after December 31, 2025.' For most residential solar shoppers in 2026, the incentive action has moved entirely to the state level — which is exactly what this calculator is designed to quantify.

Question 2

What state solar incentives are still available in 2026?

Accepted Answer

Per Autumn Proudlove, DSIRE Program Manager (DSIRE, 2024): 'DSIRE currently tracks over 3,000 state and utility-level incentive programs across the 50 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands.' The richest incentive environments as of 2026 include: Massachusetts, which offers a 15% state income tax credit (capped at $1,000 per system, but stackable with SREC II program payments averaging $45/MWh for 10 years); New York, with a 25% state tax credit up to $5,000 plus NYSERDA rebates and net metering; California, with NEM 3.0 net metering (export at avoided-cost rate, approximately $0.05/kWh) plus the SGIP battery storage rebate (up to $400/kWh for residential storage, with income-qualified adders); New Jersey, with SREC II program credits trading at approximately $85/MWh, one of the most valuable SREC markets in the country; and Colorado, with a 15% state income tax credit. States with minimal or no incentives include Alabama, Mississippi, Tennessee, and most of the Southeast. Property tax exemptions are available in over 30 states — Texas, Arizona, Florida, and New York among the most significant. Sales tax exemptions on solar equipment exist in over 25 states. The DSIRE database at dsireusa.org is the authoritative, DOE-funded, NC State–maintained registry — consult it directly or use this calculator, which pulls incentive structures from DSIRE as its primary data source.

Question 3

How does an SREC work and how much is it worth?

Accepted Answer

A Solar Renewable Energy Certificate (SREC) represents 1 megawatt-hour (MWh) of electricity generated by a solar installation. Utilities in states with Renewable Portfolio Standards (RPS) that include a solar carve-out are required to purchase SRECs to demonstrate compliance with their solar obligation. As a solar system owner, you earn one SREC for every 1,000 kWh (1 MWh) your system produces — typically tracked by a state-authorized tracking system (e.g., PJM-GATS for the mid-Atlantic). The dollar value of an SREC varies widely by state and market conditions. New Jersey's SREC II program (successor to the original SREC market) pays approximately $85/MWh for new systems; the original NJ SREC market at its peak reached $250/MWh. Massachusetts' SMART program pays approximately $45/MWh under its solar incentive program. Pennsylvania's SREC market trades at approximately $35-45/MWh, though it is highly illiquid compared to NJ and MA. SREC income is taxable as ordinary income and must be reported on your federal return (typically Schedule D or ordinary income depending on how the SRECs are structured). A 7 kW system in Massachusetts producing 8,000 kWh/year generates approximately 8 SRECs/year, worth approximately $360/year at $45/MWh — over 10 years, the present value at a 5% discount rate is approximately $2,779. This calculator computes the 10-year present value of SREC income as a separate incentive layer in your stack.

Question 4

Do state solar property tax exemptions actually matter?

Accepted Answer

Yes — they can be worth more than most homeowners realize, particularly in high-tax states with strong local mill rates. Solar panels add assessed value to your home; without a property tax exemption, you would owe property taxes on that increased value annually for as long as you own the home. Texas provides a 100% property tax exemption on the added value of solar installations under Texas Tax Code §11.27. Arizona provides a 100% exemption on the value of active solar energy devices under A.R.S. §42-11054. New York provides a 15-year property tax exemption under Real Property Tax Law §487. To quantify the exemption value: assume a $25,000 solar system adds $20,000 to your home's assessed value. At a Texas property tax rate of 2.0% (typical for many Texas counties, including parts of Dallas-Fort Worth), the annual tax savings is $400. Over 20 years, the present value at a 5% discount rate is approximately $4,986. In a high-tax New Jersey county with a 2.5% effective rate, the same calculation yields $621/year and a 20-year PV of approximately $7,730. Property tax exemption rules vary by county and municipality within states — some states allow local opt-out, meaning your county may not honor a state-level exemption. This calculator applies the state-level exemption where it exists and flags counties known to have restrictions. Per Autumn Proudlove, DSIRE Program Manager (DSIRE, 2024): DSIRE tracks over 3,000 state and utility-level programs including property tax exemptions with current program details.

Question 5

What is net metering and how is it different from an incentive?

Accepted Answer

Net metering is a billing mechanism, not a direct financial incentive in the same category as a tax credit or rebate. Under net metering, excess solar electricity you generate is exported to the grid, and your utility credits your account for that export. The key variable is the credit rate: full retail-rate net metering (common through 2022 in California, still available in many states) means exported kWh are credited at the same rate you'd pay to import electricity — effectively making the grid a free battery. California's NEM 3.0 (adopted by the CPUC in 2023, effective for new systems from April 2023) dramatically changed this: new systems now receive export credits at the 'avoided cost' rate, approximately $0.05/kWh, rather than retail rates of $0.25-0.35/kWh for PG&E customers. This reduced the solar ROI for California cash buyers by approximately 25-30% compared to NEM 2.0 assumptions. FERC Order 2222 (2020, with state implementation ongoing through 2026) is gradually enabling distributed energy resources including residential solar-plus-storage to participate in wholesale markets, which could partially offset the NEM 3.0 reduction over time. This calculator treats net metering as part of the system economics (the avoided utility bill and export credit rate), distinct from the incentive stack it quantifies. You enter your state's net metering rate in the inputs — the calculator then models the incentive layers on top of that baseline.

Question 6

How does this calculator stack multiple incentives?

Accepted Answer

The calculator applies incentives hierarchically, with each layer reducing the effective cost basis before the next is applied. The sequence is: (1) Start with the gross installed system cost (before any incentives). (2) Apply the state income tax credit — reduces your tax liability in the installation year by the credit amount; the after-credit out-of-pocket cost decreases. (3) Apply the 10-year SREC present value — calculated at a 5% discount rate using your state's current SREC price and your system's projected annual production. (4) Apply the property tax exemption present value — calculated over the exemption period (15 years in NY; indefinitely in TX and AZ) using current local mill rates. (5) Apply the sales tax exemption on equipment — reduces the initial purchase price if your state exempts solar hardware from sales tax (approximately 5-8% of the hardware cost in qualifying states). (6) Apply utility rebates — one-time upfront rebates from your utility company, if available. The result after all six layers is your true net system cost. The effective incentive rate is expressed as (gross cost − net cost) ÷ gross cost, showing what percentage of the gross install cost is offset by the full incentive stack. Per Andrew Sendy, SolarReviews Founder (SolarReviews 2024): 'State-level incentives can be worth more than the old federal credit in high-incentive states like Massachusetts, New York, and California' — this calculator is designed to prove or disprove that claim for your specific situation.

Question 7

Which states have the best combined incentive packages after the §25D expiration?

Accepted Answer

With §25D now expired, the state-level incentive landscape is what determines whether solar is financially compelling in 2026. Based on DSIRE data and NREL cost research, the top-tier states are: Massachusetts — state income tax credit (15%, cap $1,000) + SMART/SREC II ($45/MWh, 10 years) + property tax exemption + sales tax exemption; combined stack typically reduces effective cost to $1.50-2.00/watt after incentives on a median system. New York — 25% state credit (cap $5,000) + NYSERDA rebates ($0.20-0.40/W depending on program) + 15-year property tax exemption + sales tax exemption; net cost often below $2.00/watt. New Jersey — SREC II program at ~$85/MWh is one of the most valuable ongoing incentive streams in the country; 10-year SREC PV alone on a 7 kW system can exceed $5,000. Colorado — 15% state income tax credit on top of moderate hardware costs. California — despite NEM 3.0's reduction, SGIP battery storage rebates ($400/kWh) and property tax exemption make solar-plus-storage still competitive. Low-incentive states include Alabama, Mississippi, Tennessee, and most of the Southeast — where net system cost after available incentives may still be $3.00-3.50/watt, primarily offset by the economics of avoided utility bills rather than incentive stacking. Per David Feldman, NREL Senior Researcher (NREL Tracking the Sun 2024): median residential installed cost $3.05/watt nationally before any incentives.

Question 8

Should I trust the DSIRE database for my state's incentives?

Accepted Answer

DSIRE (Database of State Incentives for Renewables and Efficiency) is the most authoritative public database for state and utility solar incentive programs. It is maintained by the NC Clean Energy Technology Center at NC State University and funded by the U.S. Department of Energy. Per Autumn Proudlove, DSIRE Program Manager (DSIRE, 2024): 'DSIRE currently tracks over 3,000 state and utility-level incentive programs across the 50 states, the District of Columbia, Puerto Rico, and the U.S. Virgin Islands.' DSIRE is updated on a rolling basis as programs change — updates typically happen within 30-60 days of a program change at the state level. However, DSIRE has limitations: utility-specific rebate programs may lag the actual utility program timeline; program caps (especially for SREC programs) can be exhausted between DSIRE updates; and program eligibility rules sometimes contain nuances not fully captured in DSIRE's summary. This calculator uses DSIRE as its primary incentive data source and is updated quarterly. For any installation you're actively pursuing, you should: (1) verify the program status directly on the state energy office website or program administrator; (2) confirm current SREC prices through the program's tracking system (e.g., SRECTrade.com for market prices); and (3) consult a local solar installer who is familiar with current program terms, as incentive landscapes can shift rapidly. Never sign an installation contract based solely on online calculator estimates — always verify current program availability before committing.

State Solar Incentive Stacker

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