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Illinois Solar Tax Credit 2026: There Isn't One. Here's What Pays Instead
guide9 min read

Illinois Solar Tax Credit 2026: There Isn't One. Here's What Pays Instead

Ryan Cook•

No. Illinois doesn't have a state solar tax credit in 2026. The Illinois Department of Revenue's 2025 Schedule 1299-C instructions list 35 active income tax credits, and none of them is for solar. The 30% credit people remember was federal, and it isn't available for systems you own that were placed in service after Dec. 31, 2025. What Illinois actually pays you is a $300-per-kW rebate from ComEd or Ameren, Illinois Shines payments for your system's renewable energy credits, and a property-tax rule that keeps panels from raising your assessment when you file for it.

I hear this question a lot at kitchen tables now, usually from someone who read a national site that says otherwise. Here's what's real, where the myth comes from, and who collects what depending on whether you buy or lease.

The short version

What The 2026 answer Source
Illinois state income tax credit for home solar None. The 2025 Schedule 1299-C list has 35 active credit codes, and solar isn't one of them IDOR 2025 Schedule 1299-C Instructions (R-12/25)
Federal 30% homeowner credit (25D) Not available for property placed in service after Dec. 31, 2025 IRS, Residential Clean Energy Credit
Federal business credit used by leasing companies (48E) Ends for solar placed in service after Dec. 31, 2027, for projects starting construction after July 4, 2026 IRS Notice 2025-42
ComEd or Ameren solar rebate $300 per kW (DC) through Dec. 31, 2029; $250 per kW from Jan. 1, 2030 220 ILCS 5/16-107.6(c)(2)
Illinois Shines REC price, systems up to 10 kW AC (2026–27) $80.77 per REC (ComEd), $70.37 (Ameren) Illinois Shines 2026–27 Program Guidebook
Owner adder +$20 per REC for customer-owned systems up to 25 kW that don't claim a federal credit Illinois Shines 2026–27 Program Guidebook
Property tax Assessed at the lesser of the home's value with a conventional system or with solar (Form PTAX-330) 35 ILCS 200/10-10

Is there really no Illinois credit?

There really isn't. Most Illinois income tax credits get claimed on Schedule 1299-C, each with a four-digit code. The Department of Revenue's 2025 instructions, revised in December 2025, list 35 active codes. There's an apprenticeship credit, a film production credit, an adoption credit, a K-12 instructional materials and supplies credit, a data center construction employment credit. There's no solar credit, no renewable energy credit, no home energy credit.

The only energy-sounding names on the list are the "Reimagining Energy and Vehicles (REV) Illinois" credits. Those are business incentives for companies expanding in Illinois. A homeowner can't claim them for panels on the garage.

My take: this is one of the easiest myths to check, and one of the most expensive to believe. If you're counting on a few thousand dollars back from Springfield in April, it isn't coming.

Where the "30% up to $10,000" claim comes from

You'll find national sites and grant directories that list an Illinois residential solar tax credit worth 30% of the cost, capped at $10,000. I've also seen a "$2,000 state solar grant" floating around. Neither exists in Illinois today. I see a few likely reasons they keep circulating:

  • Template pages. Some sites write one incentives page for all 50 states. A few states do have real solar tax credits, and those numbers get pasted into states that don't.
  • Federal and state get blurred. The 30% credit was federal. It just happened to apply to Illinois homes, too.
  • A bill that never passed. In February 2011, HB3507 proposed an Illinois income tax credit of 30% of a renewable energy system's cost, up to $25,000 for systems under 50 kW. It died in the House when that General Assembly ended in January 2013. Even as written, it only covered tax years from 2012 through 2017.

If a solar quote shows a line labeled "Illinois tax credit," ask for the form number. There isn't one. In August, Illinois Shines warned its approved vendors about misleading tax-credit marketing. I cover what that warning said in my federal credit guide.

The 30% credit was federal, and it's done for owned systems

The IRS is blunt about it: the Residential Clean Energy Credit "is not available for any property placed in service after December 31, 2025." If you pay cash or finance a system in 2026, you don't get 30% back from anyone.

There's one path where federal value still shows up. With a lease or power purchase agreement, a company owns the panels and can claim a federal business credit. That company builds the value into your monthly price. That window has a clock on it too. IRS Notice 2025-42 ends the credit for solar placed in service after Dec. 31, 2027, for projects that start construction after July 4, 2026. I go deeper on this in how Illinois homeowners still get federal value in 2026.

What Illinois actually gives you

None of the three goes on your state tax return. Together they're worth more than most people expect.

1. The utility rebate. ComEd and Ameren pay $300 per kW of solar capacity through 2029. On a 6 kW system, that's about $1,800, paid once. It drops to $250 per kW on Jan. 1, 2030. Here's how the rebate works and what older systems give up.

2. Illinois Shines REC payments. Every megawatt-hour your panels make creates one renewable energy credit (REC), and Illinois Shines buys 15 years' worth. A typical 6 kW system in Illinois makes about 8 MWh a year, based on our town-by-town production estimates. That's roughly 120 RECs over the contract before the panels' slow aging. Here's what that's worth on paper, at 2026–27 prices for an owned system:

Territory Base price per REC With $20 owner adder ~120 RECs, estimated
ComEd $80.77 $100.77 about $12,100
Ameren $70.37 $90.37 about $10,800

What actually reaches you is less, after the approved vendor's fees. On 2026 contracts, payments are split: half as the first payment, with the rest spread evenly over the following six years. Your own number depends on system size and roof, so run it in the REC calculator or read the Illinois Shines breakdown.

3. The property-tax break. Under 35 ILCS 200/10-10, the county assesses your home at the lower of two values: as if it had a conventional system, or with solar. You claim it by filing Form PTAX-330 with your county assessor. It doesn't put money in your pocket. It keeps the panels from costing you more every year. The details are in do solar panels raise property taxes in Illinois.

Buy or lease: who collects what

This is where most guides get sloppy. The incentives don't stack for everyone. Who collects them depends on who owns the panels.

Incentive You buy (cash or loan) You lease ($0 down)
Illinois state tax credit Doesn't exist Doesn't exist
Federal 30% homeowner credit Not in 2026 Not applicable
Federal business credit No The leasing company may claim it, inside the 2027 deadline
$300/kW utility rebate You The system owner. Ameren says to check your contract
Illinois Shines RECs You, under a 15-year contract The leasing company
$20/REC owner adder You, if you don't claim a federal credit Not eligible
Property-tax filing You file PTAX-330 Ask your county assessor, since the leasing company owns the panels
How the value reaches you Rebate and REC payments Built into a predictable monthly price

Neither column is the right answer for everyone. If you have the cash and want the REC payments, owning makes sense, and the $20 adder now goes to nearly every owner because the 30% credit is gone. If you'd rather not write a big check or carry a 15-year production obligation, a lease puts that value into your payment. For income-qualified households, Illinois Solar for All is a separate program with no solar payments.

What I'd do

Skip the line labeled "state tax credit." Ask any company for the rebate amount, the REC estimate and who keeps each one, in writing, for both buying and leasing. Then compare them against your actual bill.

Want me to run that side by side for your house? Call me at (618) 217-2001 or request a free quote. You can also start with the savings calculator, or see how a solar lease compares with buying. Every number here is an estimate until we look at your real usage and roof.

Sources

Interactive Tool

Estimate Your Illinois Shines REC Value

See what your system could earn through Illinois Shines for the 2026–27 program year, by size and utility territory.

New 2026-2027 Price Updates

Official Illinois Shines Guidebook prices just published. Cash and finance buyers now qualify for an extra +$20/REC Small DG Customer-Owned adder (Small DG ≤25 kW, no federal tax credit claimed).

Most IL homes: 5–10 kW

3h (Chicago)4.8h (Southern IL)

Estimated REC Value (85% to customer)

$11,347

50% paid in your first year, remaining 50% quarterly over 6 years • Cash/finance buyers receive directly

How this is calculated

Illinois Shines measures value in RECs (Renewable Energy Credits). 1 REC = 1,000 kWh of solar production. More sunlight and more panels means more production — and a higher REC value.

1
Annual Production7.5 kW × 3.8 sun hrs × 365 days

10,403 kWh/year

2
Annual RECs10,403 kWh ÷ 1,000

10.4 RECs/year

3
Total 15-Year RECs10.4 × 14.2 (contract multiplier)

147.7 RECs

4
Gross REC Value147.7 RECs × $90.37/REC

$13,350

Tier: 0–10 kW • Ameren IL territory • 2026-2027 program year

+$20/REC Customer-Owned Adder applied ($70.37 base + $20.00 adder)

5
Estimated Customer REC Value$13,350 × 85%

$11,347

~15% goes to approved vendor admin fee + 5% collateral for underproduction

Tier note: Your 7.5 kW system falls in the 0–10 kW tier at $70.37/REC base. Systems over 10 kW drop to the 10–25 kW tier at $60.92/REC — a lower per-REC rate, though more total production may offset this.

Estimates based on 2026-2027 IL Shines Distributed Generation REC prices published by the Illinois Power Agency. Actual REC value depends on your system's measured production, which varies by roof orientation, shading, and panel efficiency. Lease customers benefit from RECs through lower payments — the installer claims the RECs and carries the 15-year production contract.

Get Your Estimated REC Value — Free Quote

We'll calculate your specific value based on your roof, shading, and optimal system size.

Frequently Asked Questions

No. Illinois has no state income tax credit for home solar in 2026. The Illinois Department of Revenue's 2025 Schedule 1299-C instructions, revised December 2025, list 35 active income tax credit codes, from apprenticeship expenses to film production to adoption, and none of them covers solar panels or home renewable energy. The 30% credit most people remember was federal, not Illinois, and it isn't available for homeowner-owned systems placed in service after December 31, 2025. A bill introduced in 2011, HB3507, would have created a 30% state credit capped at $25,000, but it died in the House and never became law. Even as written, it would have ended with the 2017 tax year. What Illinois does offer is a $300-per-kW utility rebate from ComEd or Ameren, Illinois Shines payments for your system's renewable energy credits, and a property-tax rule that keeps solar from raising your assessment. None of those goes on your state tax return.
Not on a system you own, unless it was installed and placed in service by December 31, 2025. The IRS says the Residential Clean Energy Credit, the 30% homeowner credit, is not available for any property placed in service after that date. That rule is federal, so it applies the same way in Illinois as everywhere else. The value can still reach you indirectly through a lease or power purchase agreement. In that setup, the company that owns the panels may claim a federal business credit, and the federal government has set an end date for solar placed in service after December 31, 2027 for projects that start construction after July 4, 2026. The company builds that value into your monthly price, and you don't file anything. If a quote for a system you'd own still shows a 30% federal credit, ask the company to explain it in writing before you sign anything.
Three, and none of them runs through your tax return. First, ComEd and Ameren pay a one-time rebate of $300 per kW of solar through 2029, which works out to about $1,800 on a 6 kW system, falling to $250 per kW starting January 1, 2030. Second, Illinois Shines buys 15 years of your system's renewable energy credits. For 2026–27, systems up to 10 kW AC earn $80.77 per credit in ComEd territory and $70.37 in Ameren territory, plus a $20-per-credit adder for systems the homeowner owns that don't claim a federal credit. Third, if you file for it, 35 ILCS 200/10-10 has the county assess your home at the lower of two values: with a conventional system, or with solar. Who collects each one depends on whether you own or lease. Income-qualified households can also look at Illinois Solar for All, a separate program with no solar payments.
Not if you file for the solar assessment. Under 35 ILCS 200/10-10, the owner of a home with a solar energy system can claim an alternate valuation with the chief county assessment officer. The assessor works out what the home would be worth with a conventional heating or cooling system and what it's worth with solar, then applies the lesser of the two for as long as the system is in use. The claim form is the PTAX-330, Application for Solar Energy Assessment, which you file with your county assessor. If the system stops being used, the law requires you to notify the assessor in writing by certified mail within 30 days. With a lease, the leasing company owns the panels, so ask your county assessor whether the filing applies to you. That's not a credit against your income tax, but it's the closest thing Illinois has to a state tax break for solar.
The leasing company does, and the value shows up in your price instead of as checks. With a lease or power purchase agreement, the company owns the panels, so it's the one that can claim the federal business credit, apply for the ComEd or Ameren rebate, and sign the 15-year Illinois Shines contract for the system's renewable energy credits. Ameren tells lease customers to check their contract to see who claims the rebate. Lease customers aren't eligible for the $20-per-credit owner adder, because that adder requires customer ownership. In return, you pay $0 down and you don't carry the 15-year production obligation. If you buy, you collect the rebate and the credit payments yourself, but you can't claim the 30% federal credit in 2026. I'd price both before you decide, using your real usage.

Related City Guides

Chicago, ILSpringfield, ILPeoria, ILRockford, ILNaperville, ILBelleville, ILChampaign, ILJoliet, IL

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A family of four can earn $97,200 in Cook County and still qualify. Here are the county numbers.Will Illinois Have Rolling Blackouts? What ComEd's 'Critical Level' Alerts Mean (2026)ComEd told parts of Chicagoland the grid hit a 'critical level' during the July heat wave. Here's the honest answer on rolling blackout risk in Illinois — and what you can control.Freedom Forever Filed for Bankruptcy — What Illinois Solar Customers Should Do NowFreedom Forever filed Chapter 11 in April 2026. If your Illinois solar system is installed, unfinished, or under quote — here's exactly what to do next.ComEd & Ameren Want Another Rate Hike — CUB Found $1 Billion in Questionable SpendingComEd filed a $15.3B grid plan and Ameren wants millions more — CUB found over $1 billion in questionable spending. What the next IL rate hikes mean for you.What Solar Panels Really Cost in Illinois in 2026 (Honest Numbers, No Lead-Selling)What solar panels actually cost in Illinois in 2026 — real per-watt and per-system numbers, what changed this year, and why we don't sell your info to five callers.Illinois Electric Rates Keep Climbing — Does Solar Finally Make Sense in 2026?Ameren and ComEd rates are up ~90% in five years and still climbing. Here's how to see what you're on track to overpay — and whether solar finally makes sense.Illinois Net Metering Changed in 2025 — What It Costs You and How to Protect Your SavingsIllinois ended full retail net metering on Jan 1, 2025. Here's what the switch to net billing actually costs solar owners — and how to protect your savings.The 30% Solar Tax Credit Ended — Here's How Illinois Homeowners Still Get It in 2026The 30% federal tax credit ended for homeowner-owned systems on Dec 31, 2025. Here's how Illinois homeowners can still capture federal solar value in 2026.How Much Does a Solar Lease Cost Per Month in Illinois? (2026)What does a solar lease actually cost per month in Illinois? Real 2026 numbers, what's included, and how a predictable lease rate compares to a rising utility bill.Ameren vs ComEd 2026: Which Costs More Per kWh? (ComEd Runs ~1.5¢ Higher)ComEd averages ~17¢/kWh, Ameren Illinois ~15.5¢/kWh. See the full 2026 breakdown: supply charges, delivery fees, summer spikes, and how much it costs per month.Ameren Rate Increase 2026: Summer Rate Ends — Oct 1 Price to Compare Is 10.441¢ (ComEd 10.103¢)Updated September 30, 2026: the Ameren rate increase put the summer Price to Compare at 11.326¢/kWh (ComEd 10.399¢) through September 30; from October 1 it is 10.441¢ (ComEd 10.103¢). See the average Illinois electric rate now, why bills jumped June 1, and what changed October 1.The Iran War Is Sending Oil Prices Through the Roof — Will Your Illinois Electric Bill Follow?Oil is at $112/barrel after the Strait of Hormuz blockade. Here's how the Iran conflict could push Illinois electricity rates even higher — and what you can do now.Why Your Ameren Bill Keeps Going Up (and What MISO Has to Do With It)Ameren bills jumped 18-22% in summer 2025 and rose again June 1, 2026. Here's why MISO capacity auctions are driving your rates up and what you can do about it.The Real Cost of Solar Panels in Illinois: 2026 BreakdownWhat do solar panels actually cost in Illinois in 2026? Real numbers for cash purchase, lease, and Solar for All — from an installer who gets prices below the state average.Selling a House With Leased Solar Panels in Illinois (2026 Guide)Selling a house with leased solar panels in Illinois? Here's how the lease transfer works, what buyers actually think, and why it's not the problem most people expect — owned systems too.Solar Lease vs Buying Panels: I Did the Math for IllinoisShould you lease or buy solar panels in Illinois? I broke down the real numbers for both paths using current 2026 prices, incentives, and Ameren/ComEd rates.Data Centers = 70% of Illinois's Rate Spike (Here's What It Costs You)Data centers drove 70% of Illinois's capacity-cost spike in 2026. See the PJM/MISO mechanism, the per-household cost impact, and what to do to protect your bill.ComEd Rate Increase 2026: Oct 1 Supply Drops to 10.103¢, but Delivery Didn'tUpdated Oct 2026: ComEd's 2026 rate increase put the Price to Compare at 10.399¢/kWh through September 30; from October 1 it is 10.103¢/kWh. What changed June 1, what reset October 1, the ICC delivery increases that didn't reset, and your all-in cost per kWh.Illinois Electricity Rates Have Nearly Doubled Since 2021 — Here's What That Means for Your BillIllinois electricity rates have surged 90%+ since 2021. Here's what's driving the increases, what to expect next, and how to protect your household.Illinois Solar Incentives 2026: 7 Programs Worth $12,000-$18,000+Illinois solar incentives 2026: Illinois Shines RECs, the new $20/REC customer-owned adder, $300/kW DG rebate, battery rebate, net metering, and property tax exemption — worth $12,000-$18,000+ on an owned system. Plus no-cost Solar for All for income-eligible households.Solar Battery Backup in Illinois — What It Actually Powers and Whether It's Worth ItWhat does a solar battery actually run during an outage? How much does it cost with the $300/kWh rebate? Here's the honest breakdown for Illinois homeowners.
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