💷 Corporate Solar Finance & Tax Guide

CAPEX vs Leasing vs PPA: Commercial Solar Finance Comparison

Which Procurement Route Delivers the Optimal Return for Your Corporate Balance Sheet?

A side-by-side financial comparison of Direct CAPEX, Commercial Asset Finance / Equipment Leasing, and Funded Power Purchase Agreements (PPAs) for UK businesses.

Executive Summary & Key Takeaways

✓ CAPEX delivers the highest 25-year financial return (18%–32% IRR) and fastest full payback for cash-rich owner-occupiers
✓ Commercial Leasing (Hire-Purchase) preserves working capital with positive cash flow from month one
✓ Corporate PPAs eliminate 100% of upfront capital expenditure and performance risk for capital-constrained firms and tenants
✓ Tax treatment differs: CAPEX unlocks £1m 100% AIA tax deduction; PPA treats power purchases as pure operating expense
✓ Evaluation matrix covers balance sheet treatment, asset ownership, maintenance liabilities, and exit flexibility

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Procurement Trilemma

CAPEX vs Asset Leasing vs Corporate PPA

Choose the financing structure aligned with your corporate hurdle rates, balance-sheet objectives, and operational risk appetite:

Evaluation Criteria	Direct CAPEX	Equipment Leasing	Corporate PPA (Funded)
Upfront Capital Outlay	100% of turnkey cost	£0 or low 1-month deposit	£0 Zero Upfront Cost
Asset Ownership	Host Business owns day 1	Transfers upon lease term end	Funder owns; host buys energy
Balance Sheet (IFRS 16)	Fixed asset + depreciation	Lease liability recorded	Off-balance-sheet OpEx
Maintenance & O&M Risk	Host business responsibility	Host business (or O&M plan)	100% Funder responsibility
Financial Yield / IRR	18% – 32% IRR (Highest)	Positive cash flow from Month 1	30% – 50% immediate unit discount
Tax Deductibility	100% AIA Year 1 (up to £1m)	Lease payments 100% tax deductible	Electricity bills tax deductible OpEx
Ideal Profile	Owner-occupiers with cash reserves seeking highest long-term yield	Growth firms preserving cash while maintaining asset ownership path	Portfolios, tenants, schools & firms prioritizing zero capital risk

Need advice on structuring? All models can be quoted simultaneously. Detailed Financial Comparison Guide →

Strategic Capital Allocation: Balancing Yield vs Liquidity

When evaluating commercial solar, CFOs and financial controllers must weigh internal hurdle rates against energy cost risk. An outright CAPEX purchase delivers the highest lifetime financial return (typically yielding Internal Rates of Return between 18% and 32% and free electricity after 3 to 5 years). However, companies deploying capital into core business expansion or operating under debt covenants often prefer Asset Finance or zero-cost PPAs.

Detailed Financing Model Breakdown

• **Direct CAPEX**: Host business funds 100% upfront using cash reserves or credit lines. Retains complete asset ownership, claims 100% Annual Investment Allowance tax shelter, and captures all financial yield. • **Asset Finance / Leasing**: 5 to 10-year term where monthly repayments are funded by avoided grid electricity costs, ensuring cashflow-neutral or positive operations from month one. Ownership transfers upon lease expiry. • **Corporate PPA**: Third-party institutional funder pays 100% of capital, design, and lifetime O&M. Host business buys generated electricity at 11p–15p/kWh, saving 30%–50% with zero capital outlay.

Accounting and Balance Sheet Treatment

Under UK GAAP and IFRS 16, direct CAPEX creates a fixed asset with annual depreciation and immediate tax write-offs. Equipment finance leases must be capitalized on the balance sheet as right-of-use assets with corresponding liabilities. In contrast, corporate PPAs function purely as off-balance-sheet energy service contracts, leaving borrowing capacity completely unencumbered.

Financial Q&A

Frequently Asked Questions

Key financial controllers and CFO considerations

Which financing route is most popular among UK commercial enterprises?

Owner-occupier SMEs and family manufacturing businesses predominantly favour direct CAPEX to maximize long-term financial yield. Enterprise logistics, multi-site retail, and institutional landlords increasingly choose corporate PPAs to eliminate capital risk across large portfolios.

Can a business switch from a PPA to ownership at a later stage?

Most corporate PPA agreements include buy-out options starting at year 5 or 10, allowing the host business to purchase the operational system at independent fair market value.

How does asset finance compare with a commercial bank green loan?

Asset finance is secured against the solar hardware itself without requiring debentures over trading assets, whereas commercial green loans may require broader business covenants but can offer lower interest rates.