How Do Solar Loans Work? A 2026 Homeowner’s Guide

Updated for 2026. A solar loan is how most homeowners who want to own their panels actually pay for them, and it is also where the fine print bites hardest. This guide explains how solar loans work in plain terms: the two kinds of loan, what the APR and term do to your cost, the hidden “dealer fee” that makes a “$0-down” loan cost more than cash, and the one thing that changed in 2026 that quietly broke a very common loan structure. Every figure is sourced and dated.

This guide is part of the MySolarFY solar financing hub, our home for how to pay for solar and how cash, loans, and lease or PPA options compare.

What is a solar loan and how does it work?

A solar loan works like a home improvement loan: you borrow the cost of the system up front, own the panels from day one, and repay the lender in fixed monthly installments over a set term, commonly about 10 to 25 years. Once the loan is paid off, the electricity the system produces no longer carries a monthly payment (EnergySage, as of 2026). The key difference from a lease or a power purchase agreement (PPA) is ownership: with a loan the system is yours, so you keep the state and utility incentives and the net-metering credits, where a lease or PPA hands those to the third party that owns the panels (DOE Homeowner’s Guide to Going Solar, as of 2026). That ownership is the reason most buyers who can qualify for a fair loan choose one. The catch, and the rest of this guide, is that “a fair loan” hides a lot of variation in rate, term, and fees.

Secured or unsecured: the two kinds of solar loan

Solar loans come in two families, and the split decides your interest rate and your risk. A secured loan uses your home as collateral, usually a home equity loan or a home equity line of credit (HELOC), and because the lender has that security it usually offers a lower APR. An unsecured loan, including most installer-arranged “solar loans,” is not tied to your home, so approval leans on your credit score and the rate tends to be higher (EnergySage, as of 2026). The trade-off is real: a secured loan can save you thousands in interest, but it puts your house on the line if you cannot pay, while an unsecured loan protects the home but costs more.

Loan type	Secured by your home (home equity / HELOC)	Unsecured solar loan (often installer-arranged)
Collateral	Your home	None; based on your credit
Typical APR	Usually lower	Usually higher
Who owns the panels	You	You
Interest tax-deductible?	Possibly, if used to improve the home that secures it (see the IRS rules below)	Generally no
Main risk	Your home is collateral	Higher cost; watch for a hidden dealer fee
Where you get it	A bank or credit union	The installer’s lending partner, a credit union, or an online lender

Sources: loan-type mechanics and rate differences per EnergySage Solar Loans and the DOE Homeowner’s Guide to Going Solar, as of 2026; interest-deductibility per IRS Publication 936, as of 2026.

APR, term, and the monthly payment: what really drives the cost

Three numbers set what a solar loan costs you: the amount financed, the APR, and the term. The APR is the yearly cost of borrowing, and a lower APR means less interest over the life of the loan. The term is how long you take to repay; solar loans commonly run about 10 to 25 years, and a longer term lowers the monthly payment but stacks up far more interest for the same rate (EnergySage, as of 2026). To put numbers on that, the same $30,000 loan at an illustrative 8 percent APR costs about $287 a month over 15 years (about $51,600 in total) but about $232 a month over 25 years (about $69,500 in total). The 25-year loan trims the monthly payment by roughly $55, yet it costs about $18,000 more in interest for the identical system (our illustration, at the same 8 percent rate used in the worked example below). Many installers pitch a loan whose monthly payment lands just below your current electric bill, which is a fair goal, but a low monthly can hide a long term, a high rate, or a fee. The honest way to compare two loans is the total you will pay over the full term, not the monthly and not the headline rate.

A low advertised APR does not always mean a cheap loan. As the next section explains, a solar-specific loan can advertise a rate as low as 1 to 7 percent while carrying a large fee that never shows up in that APR (CFPB Issue Spotlight: Solar Financing, as of August 2024). That is why the amount financed matters as much as the rate: if a fee inflates the principal, you pay interest on the fee too.

The dealer fee and the “$0-down” reality

The most important thing to understand about “$0-down” solar loans is the dealer fee. In a 2024 review of the solar-lending market, the Consumer Financial Protection Bureau found that many solar-specific lenders add a hidden fee, variously called a dealer, program, platform, lending, or finance fee, directly into the loan principal. That fee typically runs 10 to 30 percent of the system’s cash price and can exceed 50 percent, and it is often left out of the stated APR (CFPB Issue Spotlight: Solar Financing, as of August 2024). The result is that the financed price of a system ends up higher, sometimes much higher, than the cash price for the exact same equipment. In the CFPB’s own worked example, a $30,000 cash system carried a $9,000 (30 percent) hidden fee, so the homeowner financed $39,000 for the same panels (CFPB, as of August 2024).

Note: “$0-down” describes how a loan is financed, not that solar is free. A no-money-down solar loan can still cost more than paying cash, because the dealer fee and the interest are built into what you repay. Before you sign, ask the installer for the cash price in writing and compare it to the financed price. If the financed price is much higher for the same system, a dealer fee is likely buried in the loan (CFPB, as of August 2024). MySolarFY is a free matching service; solar panels are not free.

How do solar loans work with tax credits and incentives in 2026?

Because a loan-financed system is yours, you keep the state and utility incentives and net-metering credits that come with owning it, which a lease or PPA hands to someone else (DOE, as of 2026). But the biggest incentive most buyers used to count on is gone. The 30 percent federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025 under the 2025 budget law, so a homeowner who installs solar in 2026 cannot claim that 30 percent federal credit (IRS Residential Clean Energy Credit; IRS guidance on Public Law 119-21, as of 2026). You will still see installers and search results say the 30 percent credit applies; for a 2026 homeowner purchase, that is out of date. MySolarFY does not provide tax advice, so confirm your own situation with a tax professional. For the full breakdown, see what the end of the federal solar tax credit means in 2026.

This is where a very common loan structure quietly broke, and it is the 2026 trap to watch for. For years, many low-payment solar loans were built around the tax credit: the lender set an artificially low monthly payment on the assumption that you would make a large lump-sum principal payment, usually around 20 to 30 percent of the system cost (pegged to the 30 percent federal credit), within about 12 to 18 months. If you made that paydown, the low payment held. If you did not, the loan re-amortized the remaining balance and your monthly payment jumped, often around month 18 or 19 (CFPB Issue Spotlight: Solar Financing, as of August 2024). The problem for a 2026 system is simple: the 30 percent Section 25D credit ended for expenditures made after December 31, 2025, so there is no federal tax credit anymore to fund that lump sum (IRS, as of 2026). If a loan is still written that way, you would have to make the paydown out of your own savings, or your payment climbs (CFPB, as of August 2024). The table shows the before-and-after.

The federal credit and your loan	Through 2025	2026 onward
Homeowner federal tax credit	30% Section 25D credit on a bought system	Section 25D ended after 12/31/2025; no federal credit for the buyer (IRS, 2026)
“Re-amortize with your tax credit” loan	Buyer used the ~30% credit as the required lump-sum paydown	No credit to fund the paydown; the payment jumps unless you pay the lump sum from savings (CFPB, 2024)
The one federal credit left	Commercial credit on third-party systems	Section 48E stays with the company that owns a lease or PPA system, never the homeowner (IRS, 2026)

One more incentive question homeowners ask is whether the loan interest itself is tax-deductible. Generally, no. Interest on a typical unsecured solar loan is not tax-deductible. Interest may be deductible only if the loan is secured by your home and the money qualifies as home improvement debt under the IRS mortgage-interest rules, which can apply to a home equity loan or HELOC used to improve the home that secures it (IRS Publication 936; IRS Topic No. 505, as of 2026). This is another reason a home-secured loan can beat an unsecured one on cost, but it depends on your tax situation, so confirm it with a tax professional.

What a solar loan really costs: the same $30,000 system, three ways

To make the dealer fee concrete, here is the same $30,000 system paid three ways. This is our own illustration, not a quote, built to show the direction and rough scale of the difference, so read it with the assumptions below and get real numbers from your own quotes.

How you pay for a $30,000 system	Amount financed	Rough monthly	Rough total paid for the system	Own it?
Cash	none	none	about $30,000	Yes
Loan with no dealer fee (credit union or home equity)	about $30,000	about $251	about $60,000 over 20 years	Yes
Dealer-fee solar loan (30% fee added)	about $39,000	about $326	about $78,000 over 20 years	Yes

The assumptions, so you can follow the math. All three rows put the identical panels on the roof: a $30,000 cash-price system, using the CFPB’s own worked example, with no federal 25D credit in 2026 to offset any of it because that credit ended after December 31, 2025 (CFPB, 2024; IRS, 2026). Both loan rows use the same illustrative 8 percent APR over the same 20-year term, so the only thing that changes between them is the dealer fee. The 8 percent rate is illustrative, not a quote; real solar-loan APRs vary widely with your credit and the loan type, where a secured home-equity loan is usually lower and an unsecured solar loan often higher (EnergySage, as of 2026). The dealer-fee row adds a 30 percent fee (the CFPB’s example figure) to reach a $39,000 financed amount. These are illustrative estimates, and every one of these numbers moves with your quote, your credit, your rate, and your term.

Read the gap between the two loans as the price of the fee. The two loans carry the exact same rate and term, yet the dealer-fee loan costs roughly $18,000 more over its life for the identical system, because you pay interest on the fee as well as the fee itself. Financing at all adds interest on top of the cash price; the fee then piles on top of that. None of this means a loan is a bad idea, because a loan lets you own the system without a large check up front, and all three paths offset the same electricity. At the U.S. average residential rate of 18.83 cents per kWh (EIA, March 2026), a system this size offsets roughly $2,600 of grid power a year, which is what makes even a financed system pay over time. The lesson is narrower and more useful: get a loan without a buried dealer fee, and compare the total cost. To run the savings side for your own home, see how much solar panels cost and whether solar panels are worth it.

Prepayment, and how to compare loan quotes

Two more terms decide whether a solar loan is a good one: prepayment and the all-in comparison. Before you sign, ask whether the loan has a prepayment penalty. Many solar loans let you pay extra or pay off early with no penalty, which is valuable if you expect a windfall or plan to sell, but some contracts charge for it, and the balloon or re-amortization structure above is a form of prepayment expectation you need to understand (U.S. Treasury, Before You Purchase and Finance Solar Panels, as of 2026). Get the answer in writing.

When you compare quotes, compare the same things across every lender. In the solar loan quotes our editorial team reviews, the most common trap is a low advertised monthly payment that hides a longer term, a hidden dealer fee in the principal, or a re-amortization clause, which is exactly why the monthly alone is the wrong number to shop on. Line up the cash price, the amount financed, the APR, the term, the monthly payment, any dealer or origination fee, and whether there is a prepayment penalty or a re-amortization clause. A loan that looks cheapest on the monthly payment is often the most expensive over the full term. Comparing the total cost across two or three quotes, not the advertised rate alone, is the single most protective thing you can do (CFPB, as of August 2024; DOE consumer warning, Don’t Get Burned, as of 2026).

Questions to ask before you sign a solar loan

The best protection against a bad loan is a short list of direct questions, asked before you sign. Any reputable lender or installer will answer these in writing.

• Get the cash price in writing, then compare it to the financed price. A big gap points to a hidden dealer fee (CFPB, 2024).
• Ask for the dealer fee and the all-in cost, not just the APR. A low headline rate can hide a large fee baked into the principal.
• Ask whether the loan re-amortizes or has a balloon payment. Find out what your payment becomes if you do not make a lump-sum paydown, because the federal tax credit that used to fund one ended for expenditures after December 31, 2025 (IRS, 2026).
• Confirm the APR and the term, and total the payments. Multiply the monthly by the number of months to see the true cost over the full term.
• Ask about a prepayment penalty. Confirm you can pay extra or pay off early without a charge (U.S. Treasury, 2026).
• Ask whether the loan is secured by your home. A secured loan may carry a lower rate and deductible interest, but it puts your home up as collateral (IRS Pub 936, 2026).

A note on choosing the company itself. Financing is only half the decision; the installer matters just as much. Rather than trusting a “best installer” list, get quotes from more than one licensed company and compare them on objective criteria: licensing, warranties, equipment, the cash price, and a written production estimate. To weigh a loan against the other ways to pay, see our guides on solar loan vs lease vs cash and solar lease vs PPA, or start with our full solar financing guide. To see how we source and check the figures on this page, read our data and methodology, how MySolarFY works, and about our editorial team.

Check which solar programs and financing options are available at your address →

Frequently asked questions

Are solar loans a good idea in 2026? A solar loan is a good idea for a homeowner who wants to own the system without paying the full price up front, because ownership means you keep the state and utility incentives and net-metering credits, and once the loan is paid off the electricity carries no monthly payment (DOE, as of 2026). The risk is cost. Many solar-specific loans carry a hidden dealer fee, often 10 to 30 percent of the cash price, baked into the principal (CFPB, as of August 2024), so a financed system can cost far more than a cash one. A loan without that fee, compared on total cost, is usually a sound way to pay for solar.

What is a solar dealer fee and how do I avoid it? A dealer fee is a hidden charge many solar-specific lenders add to the loan principal to “buy down” a low advertised interest rate. The Consumer Financial Protection Bureau reports these fees typically run 10 to 30 percent of the system’s cash price, can exceed 50 percent, and are often left out of the stated APR (CFPB Issue Spotlight: Solar Financing, as of August 2024). You avoid it by asking for the cash price in writing and comparing it to the financed price: if the financed price is much higher for the same equipment, a dealer fee is buried in the loan. A credit-union or home-equity loan often avoids the fee entirely.

Is the 30% federal solar tax credit gone for 2026 buyers? Yes. The 30 percent federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025 under the 2025 budget law (IRS; IRS Public Law 119-21 guidance, as of 2026), so a homeowner who buys solar in 2026 with cash or a loan cannot claim it. A separate commercial credit, Section 48E, can apply to a leased or PPA system, but the company that owns the panels claims it, not you (IRS, as of 2026). State and utility incentives and net metering were not affected. MySolarFY does not provide tax advice; consult a tax professional.

Is solar loan interest tax deductible? Generally, no. Interest on a typical unsecured solar loan is not tax-deductible, the same as most personal loan interest (IRS Topic No. 505, as of 2026). Interest may be deductible only if the loan is secured by your home and the proceeds qualify as home improvement debt under the IRS mortgage-interest rules, which can apply to a home equity loan or HELOC used to substantially improve the home that secures it (IRS Publication 936, as of 2026). Whether it applies depends on your tax situation, so confirm with a tax professional. MySolarFY does not provide tax advice.

What is a re-amortization or balloon payment on a solar loan? It is a clause that sets a low initial monthly payment on the assumption that you will make a large lump-sum principal payment, historically around 20 to 30 percent of the system cost and pegged to the 30 percent federal tax credit, within about 12 to 18 months. If you do not make that paydown, the lender re-amortizes the remaining balance and your monthly payment increases, often around month 18 or 19 (CFPB, as of August 2024). This matters in 2026 because the federal credit that used to fund that lump sum ended after December 31, 2025 (IRS, as of 2026). If a loan is still written this way, ask what your payment becomes if you never make the paydown.

Should I get a secured or unsecured solar loan? A secured loan, such as a home equity loan or HELOC, is tied to your home as collateral and usually carries a lower APR, and its interest may be tax-deductible if used to improve the home (EnergySage; IRS Pub 936, as of 2026). An unsecured solar loan is not tied to your home, so it protects the house but usually costs more and is where hidden dealer fees show up most. The right choice depends on how much you value the lower rate against putting your home up as collateral. Either way, compare the total cost across a few lenders, not just the monthly payment.

Does a $0-down solar loan mean it is free? No. “$0-down” means the loan finances the up-front cost, not that the system costs nothing. You still repay the full amount plus interest, and if the loan carries a dealer fee, the financed price is higher than the cash price for the same system (CFPB, as of August 2024). Solar panels are not free, and any pitch promising panels at no cost is a red flag (DOE consumer warning, Don’t Get Burned, as of 2026). A loan can still be a smart way to pay, because you own the system and keep the incentives, but treat it as a purchase financed over time, not a giveaway.

Reviewed by the MySolarFY editorial team, as of July 2026. Figures were verified against the linked IRS, CFPB, DOE, U.S. Treasury, SEIA, EIA, and EnergySage sources; solar loan rates, terms, dealer fees, and incentives change and vary by lender, installer, state, and utility, so confirm current details for your own quote before you decide. MySolarFY does not provide tax, legal, or financial advice; consult a licensed professional about your own situation. See our editorial team, how MySolarFY works, and our data and methodology.

MySolarFY is a free service that matches homeowners with licensed solar installers. We are not an installer, financing company, lender, tax advisor, or government program. “No up-front cost” refers to qualifying lease or PPA financing, where eligible homeowners may have no out-of-pocket cost at installation; a solar loan is a purchase financed over time, not a giveaway, and solar panels are not free. A financed solar system carries interest and any dealer fee, so total loan payments may exceed the cost of a cash purchase for the same system. The federal residential credit (Section 25D) ended for expenditures made after December 31, 2025, so a 2026 homeowner cannot claim it; the commercial Section 48E credit belongs to the company that owns a lease or PPA system, not the homeowner. Eligibility, savings, incentives, fees, and rates vary and are not guaranteed. See our full disclaimer.