Fixed-rate payment calculator
Solar loan calculator: see more than the monthly payment
Use the APR, term, amount financed, and separate cash price from a written offer. The calculator shows scheduled payment cost without guessing whether any price difference is a dealer fee.
Last verified July 22, 2026
Free solar loan calculator
See the payment and total scheduled cost
The starting numbers are an arithmetic example, not a rate quote or market-rate claim. Replace them with the written terms from your offer.
- Estimated monthly payment
- $211.84300 scheduled payments
- Total of scheduled payments
- $63,552.73
- Interest across the schedule
- $33,552.73
- Amount financed minus cash price
- $3,000.00
Fixed-rate amortization estimate only. It assumes every scheduled payment is made on time and does not model prepayment, late fees, taxes, insurance, balloon payments, re-amortization, or terms not included above. Values stay in your browser.
The four loan numbers that answer different questions
Amount financed
The principal balance used by this calculator. Confirm what contract charges are included.
APR
A standardized annual measure of credit cost. It is not the same field as a simple interest rate.
Finance charge
The disclosed dollar cost of consumer credit for covered transactions; compare it with the calculator's interest estimate.
Total of payments
What scheduled payments add up to if the loan runs as written. Check the lender's disclosure.
Why the cash price belongs beside the financed amount
A loan offer and a cash offer can show different starting prices. Entering both reveals the arithmetic difference before interest. That difference is a prompt for an itemized explanation, not proof of a specific fee. Confirm that the equipment and project scope are identical before treating the numbers as comparable.
Then compare the disclosed finance charge and total of payments. The calculator's total assumes a conventional fixed payment with no changes. Your contract controls if it includes a balloon payment, prepayment, re-amortization, promotional term, or other feature.
Loan document checklist
- Cash price for the same equipment and scope
- Amount financed and itemized contract charges
- APR and disclosed finance charge
- Payment amount, count, and due dates
- Total of payments
- Prepayment and late-payment terms
- Any balloon payment or re-amortization assumption
- Lien, transfer, cancellation, and dispute terms
Calculator questions
- Does this estimate my tax savings?
- No. It models only the loan terms entered. Incentive eligibility is separate and should not be assumed in a payment calculation.
- Is the calculated payment a lending offer?
- No. It is a fixed-rate math estimate. Compare it with the lender's disclosures and signed contract.
- Why can the lender's total differ?
- Timing, rounding, fees, payment structure, or other contract terms can change the result. Ask the lender to reconcile each field rather than relying on this estimate alone.
Need the ownership context too? Read the solar financing guide or put two complete proposals into the quote comparison worksheet.
Primary sources
Verified July 22, 2026
- 12 CFR § 1026.18 — Content of disclosuresConsumer Financial Protection BureauFederal disclosure requirements that include APR, finance charge, payment schedule, and total of payments for covered credit transactions.
- Homeowner's Guide to Solar Financing: Leases, Loans and PPAsU.S. Department of EnergyOfficial overview of ownership, loans, leases, PPAs, and contract questions.
- Solar Power for Your HomeFederal Trade CommissionConsumer guidance on comparing offers, contracts, claims, and financing.
Check the loan inside your actual solar proposal
The free check extracts the price, system size, and visible financing fields from the proposal you received, then identifies the terms that still need an answer.
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