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Why Is My Solar Loan Bigger Than the Cash Price? A '1.99%' Loan Can Really Cost 4.4%
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Why Is My Solar Loan Bigger Than the Cash Price? A '1.99%' Loan Can Really Cost 4.4%

Ryan Cook•

If your solar loan is for more money than the system's cash price, you're almost certainly looking at a dealer fee. It's a markup the lender folds into the loan so it can advertise a low rate. The federal Consumer Financial Protection Bureau found these fees typically run 10 to 30 percent of the cash price, and can top 50 percent. By my math, a "1.99%" 25-year loan carrying a 30 percent fee really costs about 4.4 percent on the money that actually paid for your panels.

I quote cash, loans and leases, and dealer fees aren't automatically a scam. Sometimes the low-rate-plus-fee loan really is the better deal. The problem is that most homeowners never see the cash price next to the loan amount, so they can't tell.

The key numbers

What Figure Source / date
Typical solar loan "hidden fee" 10 to 30% of the cash price; can exceed 50% CFPB Issue Spotlight: Solar Financing, Aug. 2024
CFPB's worked example $30,000 cash price + $9,000 fee = $39,000 loan principal CFPB Issue Spotlight, Aug. 2024
Advertised APRs on solar-specific loans Typically 1 to 7% CFPB Issue Spotlight, Aug. 2024
Federal homeowner solar credit (25D) Not available for systems placed in service after Dec. 31, 2025 IRS Residential Clean Energy Credit page, updated July 4, 2026
Cancel a sale signed at your home Within 3 full business days 815 ILCS 505/2B
Illinois Shines Complaint Center 1-877-708-3456 IPA/Illinois Shines solar loan handout, June 2025

What a dealer fee is, and where the money goes

The CFPB's example is a $30,000 system with a $9,000 fee. Your loan documents say $39,000. The lender sends the installer $30,000 and keeps the $9,000. You pay interest on all $39,000 for the life of the loan.

The fee rarely says "dealer fee" on your paperwork. The CFPB lists the industry's other names for it: program fees, lending fees, finance fees, platform fees and original issue discounts. The report also says lenders typically leave these fees out of the cost-of-credit figures they show you. Salespeople often don't explain why the cash price and the loan amount differ.

Illinois Shines puts it plainly in its homeowner handout on solar loans. Hidden fees "may be used to make the interest rate on your loan look artificially low, but you could end up paying more overall."

The math on an Illinois-size system

Our Illinois cost guide puts most purchased home systems roughly between $20,000 and $30,000 before incentives, so I ran the numbers on a $20,000 system with a 25-year loan at 1.99%. The last column shows what the payments really cost when you measure them against the $20,000 that paid for the panels.

Dealer fee Loan principal Monthly payment Total of 300 payments Effective rate on the $20,000
None $20,000 $84.67 $25,402 1.99%
10% $22,000 $93.14 $27,942 2.84%
20% $24,000 $101.61 $30,482 3.64%
30% $26,000 $110.08 $33,023 4.40%

Our calculation: standard amortization. The effective rate is the interest rate at which those payments repay $20,000. Illustrative, not a quote.

The 30 percent row is the one that stings. It adds about $7,600 over the life of the loan, on a system that never changed.

Moving makes it worse. Seven years in, that 30-percent-fee loan still has a balance of about $19,970, nearly the whole cash price of the system. You paid the full fee on day one but only got seven years of the low rate. If there's a real chance you'll sell in the next decade, a fee-loaded loan is the wrong tool.

The 18-month payment jump, and why 2026 changes it

The second trap shows up on the loan's payment schedule. Many solar loans set your first payments as if you'll pay down a big chunk of the balance early. If you don't, the loan re-amortizes and the payment rises for good. The CFPB calls it "commonplace" for solar loans to re-amortize "at the 19th month," and says the required prepayment is frequently 30 percent of the principal, the size of the old federal credit.

Here's the illustration, using the $26,000 loan from the table:

  • Months 1–18: about $77 a month, priced as if $7,800 is coming.
  • Pay $7,800 down: the payment stays near $78.
  • Don't: the payment jumps to about $113, roughly 46% higher, for the next 23 and a half years.

In 2026 that paydown money often doesn't exist. The IRS says the homeowner solar credit "is not available for any property placed in service after December 31, 2025." A salesperson who still pitches a "30% tax credit" on a purchased home system this year is working from an old script.

Some loans now count on the Illinois Shines incentive for the paydown instead. Read your contract carefully. The IPA's handout says the incentive "is paid to the Approved Vendor and the amount you receive, if any, depends on your contract with them." If your payment math depends on a check, find out who receives it and when.

A paydown schedule isn't bad by itself. It's fine when the money is written into your contract and you know the date. It turns into a problem when the money is a guess.

Five questions to ask before you sign

  1. "What's the cash price for this specific system?" Get it in writing, on the same page as the loan amount.
  2. "What's the amount financed?" Subtract the cash price. That's your fee.
  3. "What's the total of all payments?" Federal Truth in Lending rules (Regulation Z) require a standard loan disclosure to show the "amount financed" and the "total of payments." Compare those numbers, not the rate.
  4. "Does the payment go up if I don't pay something down? When, and by how much?" Ask for both payments in dollars.
  5. "Is there a prepayment penalty?" Illinois Shines tells homeowners to ask, since paying a loan off ahead of schedule "can save money on the total interest amount."

Then shop the loan itself. The Illinois Shines handout lists bank and credit-union personal loans and home equity lines next to solar-specific loans, and its first tip is to "shop around."

How a lease avoids the problem

A lease isn't a loan, so there's no principal for anyone to mark up. You pay for the power, under a payment schedule that's written into the contract before you sign. The Illinois Shines handout also notes that with a lease, the owner of the project receives the federal tax credit, not you. In an August 7, 2026 notice, Illinois Shines confirmed that the residential credit has sunset but "the commercial credit is still available." That's why a lease can still reflect federal incentive value in 2026.

The leases I offer start as low as $0.10 per kWh, with $0 down, a predictable rate schedule and a 25-year term. Compare that rate to the Price to Compare on your bill. ComEd's is 10.103¢ per kWh, and Ameren's is 10.441¢ for the first 800 kWh (8.262¢ above that), both from Oct. 1, 2026 through May 31, 2027. Don't compare it to a loan's advertised rate. Leases still need the same scrutiny: check the yearly increase, the term, and what happens when you sell.

If you've already signed something you're unsure about, read how to get out of a solar contract in Illinois. The three-day cancellation clock under 815 ILCS 505/2B doesn't start until you've received a written Notice of Cancellation. If a loan application was denied, your credit rights after a solar denial are worth reading too.

Where this leaves you

Put three numbers side by side: the cash price, the amount financed and the total of payments. If someone won't give you all three, that tells you plenty. Then compare buying with leasing in Illinois, and see why the federal tax credit ending changed the math. The solar savings calculator gives you a ballpark for your own bill.

Want a second set of eyes on a quote you already have? Send it over through our contact page or call (618) 217-2001. I'll line up the cash price, the loan and a lease side by side, check whether you qualify for Illinois Solar for All, and tell you what I'd do. These are estimates, not promises. Your actual numbers depend on your contract, your usage and your utility.

Sources

Frequently Asked Questions

Most often it's a dealer fee: a markup the lender adds to the loan principal so it can advertise a low interest rate. The Consumer Financial Protection Bureau's August 2024 solar financing report says these fees typically run 10 to 30 percent of the cash price and can top 50 percent. In the CFPB's example, a $30,000 system carries a $9,000 fee, so the loan documents show $39,000. The installer gets $30,000 and the lender keeps the $9,000. The CFPB also found lenders usually leave these fees out of the cost-of-credit figures they show you. The fee can go by other names, including program fee, platform fee, finance fee or original issue discount. To find yours, ask the installer in writing for the price if you paid cash. Then subtract that from the amount financed on your loan documents. The difference is the markup you're borrowing, and you pay interest on it for the full term of the loan.
Only if the loan amount matches the cash price, and it often doesn't. On a $20,000 cash-price system, a 25-year loan at 1.99% with a 30 percent dealer fee has a principal of $26,000 and a payment of about $110 a month. Measured against the $20,000 you actually received, that's an effective rate of about 4.4 percent, by our math. Total payments come to about $33,000, versus about $25,400 for the same rate with no fee. A 1.99% loan can still beat a higher-rate loan with no markup, so the stated rate alone tells you very little. Compare three numbers side by side: the cash price, the amount financed and the total of all payments. The Illinois Shines homeowner handout warns that hidden fees 'may be used to make the interest rate on your loan look artificially low.' Run the math before you sign.
Many solar loans set the first payments as if you'll pay down a chunk of the balance, often about 30 percent, within the first year or two. If you don't, the loan re-amortizes and the payment rises. The CFPB says that paydown is frequently 30 percent of the principal, the size of the old federal tax credit. In our illustration, a $26,000 loan at 1.99% over 25 years starts near $77 a month. Pay $7,800 down by month 18 and it stays near $78. Skip it and the payment jumps to about $113, roughly 46 percent higher. That matters more in 2026. The IRS says the homeowner solar credit isn't available for systems placed in service after December 31, 2025. Some loans count on the Illinois Shines incentive instead, and the IPA notes that incentive is paid to the Approved Vendor, not directly to you. Get in writing where your paydown money comes from.
If you signed at home with a salesperson in the room, Illinois law generally gives you three business days to cancel. Under 815 ILCS 505/2B, part of the Illinois Consumer Fraud Act, a consumer may cancel a sale made at their residence 'within 3 full business days.' The seller must hand you a Notice of Cancellation form. The three days don't start until you actually get that notice and the seller's address. Send your cancellation in writing and keep a copy. The loan is often a separate document from the installation contract, so cancel both and ask the lender to confirm in writing. After the window closes, your options depend on the contract, but you can still file complaints. Reach the Illinois Shines Complaint Center at 1-877-708-3456 or the Illinois Attorney General's Chicago consumer protection hotline at 1-800-386-5438.
A lease doesn't involve a loan, so there's no loan principal for a lender to mark up. You don't borrow anything. You pay for the power the panels make, or a monthly amount, under a contract that lists the full payment schedule before you sign. The Illinois Shines solar loan handout notes that with a lease or power purchase agreement, the project owner receives the federal tax credit, not you, and that 'maintenance and repairs are usually included and there are often no upfront costs.' That doesn't mean every lease is a good deal. Compare the starting rate, how much it can rise each year, the term and what happens if you sell the house. The leases I offer start as low as $0.10 per kWh with $0 down, a predictable rate schedule in the contract, and a 25-year term. Measure any offer against your utility bill, not against a loan's advertised rate.

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

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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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