Cash vs Loan vs Lease: Best Way to Finance Solar in Arizona (2026)

How you finance solar is one of the most impactful decisions you'll make — potentially worth tens of thousands of dollars in difference over 25 years. The good news: even the "second best" option (a solar loan) still provides excellent returns for most Arizona homeowners.

This guide covers all three financing paths with real Arizona numbers. Before diving in, review Arizona solar panel costs and understand the federal tax credit — both affect how financing options compare.

Option 1: Cash Purchase

How It Works

You pay the full system cost upfront and own the panels outright from day one. All tax credits and incentives go directly to you.

Real Arizona Example (8 kW system)

• Gross system cost: $17,040
• Federal ITC (30%): −$5,112
• AZ state credit: −$1,000
• Net out-of-pocket: $10,928
• Year 1 electricity savings: ~$1,780
• Payback period: ~6.1 years
• 25-year net savings: ~$42,000

Pros

• Highest total return over 25 years — no interest paid
• You claim both federal and Arizona state tax credits
• Own the system outright, adds full value to home resale
• Lowest complexity — no monthly payments, no lender relationship

Cons

• Large upfront outlay ($10,900+ after credits)
• Opportunity cost: that capital could be invested elsewhere
• Best for homeowners with liquid savings and a long time horizon

Option 2: Solar Loan

How It Works

A solar loan lets you own the system with little or no money down. You make monthly loan payments but also own all the tax credits and savings. Loan payments are typically less than your previous electric bill, making most Arizona homeowners cash-flow positive from day one.

Types of Solar Loans in Arizona

• Dedicated solar loans: Offered through installers or solar-specific lenders (Mosaic, Sunlight Financial, Goodleap). Rates: 4–8% APR, terms 10–25 years. Often $0 down.
• Home equity loan / HELOC: Uses your home's equity. Typically lower rates (5–7%) but puts your home as collateral. Interest may be tax-deductible.
• Personal loans: Higher rates (7–15%), no collateral. Less ideal for solar but available to those without home equity.
• PACE financing: Property-Assessed Clean Energy — repaid through your property tax bill. Available in some Arizona cities. No upfront cost, but adds to property tax burden.

Real Arizona Example (8 kW, $0 down, 5.99% APR, 20 yr)

• Loan amount: $17,040 (gross, before credits)
• Monthly payment: ~$122/mo
• Monthly savings vs current bill: ~$148/mo
• Month 1 net benefit: +$26/mo cash flow positive
• Federal ITC applied to loan in year 1: −$5,112 lump sum payment (many lenders require this)
• After ITC payment, remaining loan balance: ~$11,928 → new monthly payment ~$85/mo
• 25-year net savings after interest: ~$34,000

Important: Many solar loan contracts require you to apply the federal tax credit as a lump-sum principal payment within 12–18 months. If you don't have the tax liability or cash flow to do this, you'll pay more interest. Ask lenders how they handle the ITC before signing.

Option 3: Lease / Power Purchase Agreement (PPA)

How It Works

You don't own the system. Instead, you pay a monthly fee either for the system itself (lease) or for the electricity it produces (PPA). The installer owns the panels, claims all tax credits, and maintains the system.

Real Arizona Example (8 kW PPA)

• PPA rate: ~$0.08/kWh for solar electricity (typical starting rate)
• Annual escalator: 2.9%/yr
• Year 1 PPA payment: ~$1,056/yr
• Year 1 electricity savings: ~$1,780
• Year 1 net benefit: ~$724
• 25-year net savings: ~$12,000–$18,000 (after escalating payments)

Pros of Lease/PPA

• $0 upfront cost
• Installer maintains and warrants the system
• Immediate electricity bill reduction with no financial risk
• Accessible if you can't qualify for a loan

Cons of Lease/PPA

• You do not qualify for federal or Arizona state tax credits
• Payments escalate every year, eroding savings over time
• Complicates home sale: buyer must qualify for lease transfer or you must buy out the system
• 25-year net savings typically 60–70% less than a cash purchase
• System owner may have different priorities than you for maintenance quality

Side-by-Side Comparison

Which Option Is Right for You?

• Choose cash if: You have sufficient savings, can capture the full ITC this tax year, and want maximum long-term return
• Choose a solar loan if: You want to own the system and tax credits but prefer $0 down; you have good credit (680+); your monthly loan payment will be less than your current electric bill
• Choose lease/PPA if: You cannot qualify for a loan, cannot use the tax credits due to very low tax liability, or want the simplest possible arrangement with no financial risk