Solar Asset Finance for UK Businesses

Installing solar on your business premises does not have to mean a large upfront capital outlay. UK businesses now have a well-developed menu of asset finance options — hire purchase, finance leases, operating leases, power purchase agreements (PPAs), and dedicated green loans — each with distinct balance sheet treatment, tax implications and cash-flow profiles. Choosing the wrong structure costs money; choosing the right one can make a commercial solar project cash-positive from month one. This guide explains how each model works, who it suits, and what the current accounting rules say.

Why the finance structure matters as much as the hardware

Capital efficiency and tax relief interact directly with how you fund a solar installation. A hire purchase arrangement lets your company claim a 50% special rate first-year capital allowance on the panels (HMRC classifies solar panels as special rate plant, not main rate), whereas an operating lease or PPA keeps the asset off your balance sheet entirely — transferring ownership risk to the provider but forfeiting the capital allowance. Since FRS 102 was updated in line with IFRS 16 for accounting periods beginning on or after 1 January 2026, even most operating leases now appear on the balance sheet as a right-of-use asset and a lease liability, closing the gap between the two standards. Understanding this before signing a contract is critical.

The four main solar asset finance structures

1. Hire purchase

How it works: You pay a deposit (typically 10–20%), then fixed monthly instalments over 3–7 years. Legal ownership transfers to you at the end, usually on payment of a nominal option fee. The asset sits on your balance sheet from day one because the risks and rewards of ownership have transferred.

Tax angle: Because you are treated as the owner, your company can claim HMRC's 50% special rate first-year allowance on qualifying solar expenditure in the year of acquisition. Any remaining balance enters the special rate pool and attracts an 8% writing-down allowance per year. Solar panels have been specifically designated as special rate plant by HMRC since April 2012, so the 100% full expensing relief that applies to main-rate plant does not extend to panels.

Best for: Profitable companies with taxable profits to offset, a stable cash flow, and a preference for outright ownership at term end.

2. Finance lease

How it works: A leasing company buys the panels and leases them to you for most of their useful life. You do not own the asset legally, but under FRS 102 (post-2026) and IFRS 16 you recognise a right-of-use asset and a corresponding lease liability on your balance sheet. Lease payments split into a capital repayment and an interest charge in your income statement.

Tax angle: The lessee cannot claim capital allowances (those belong to the lessor), but the implicit interest element of each payment is deductible as a finance charge. Rentals under a finance lease are not treated as trading expenses in the normal way.

Best for: Businesses that want spread payments without tying up working capital, are comfortable with an on-balance-sheet liability, and do not need the capital allowance personally (e.g. those already loss-making).

3. Operating lease

How it works: You rent the system for a shorter period, typically 5–15 years. Before the FRS 102 update effective January 2026, operating leases sat off balance sheet and rental payments were simply expensed to the P&L. Under the new single-model rules, most operating leases now require recognition of a right-of-use asset unless the lease qualifies as short-term (12 months or less) or as a low-value asset — short-term and low-value exemptions are still permitted.

Best for: Businesses that want to avoid large asset values on the balance sheet (subject to the new exemption thresholds), or that anticipate technology upgrades and want flexibility at lease end.

4. Power Purchase Agreement (PPA)

How it works: A solar developer installs and owns the panels on your roof at zero upfront cost. You agree to buy the electricity generated at a fixed pence-per-kWh rate — often 10–15% below your current grid tariff — for a contract term of typically 10–25 years. The developer takes the capital allowances and maintains the system. You pay only for the electricity you use.

Balance sheet treatment: Because the developer owns the hardware and there is no right-of-use of the panels per se (only a right to purchase electricity), a well-structured on-site PPA is generally treated as a supply contract rather than a lease. It stays off your balance sheet. However, complex arrangements should be reviewed by an accountant in light of the 2026 FRS 102 changes.

VAT: Commercial solar installations attract 20% VAT. Under a PPA, VAT is charged on the electricity supplied — the same as your normal grid bill. If your business is VAT-registered, input tax recovery applies in the usual way.

Best for: Businesses with limited access to capital or credit, those that want no maintenance responsibility, or organisations where balance sheet cleanliness is a priority (e.g. pre-fundraise or pre-sale businesses).

For a fuller picture of what commercial solar installations typically cost before choosing a finance route, see our guide to commercial solar panels UK: costs, ROI and how business solar works.

Green loans and government-backed finance

Dedicated green loans are now widely available from high-street banks — Barclays, HSBC, Lloyds and NatWest all offer products specifically for renewable energy and energy-efficiency investment. Interest rates vary by lender and business risk profile; the British Business Bank's guidance on green loans for smaller businesses is a good starting point for comparing products. A pilot "Green Growth Guarantee Scheme" is also running, enhancing the existing Growth Guarantee Scheme to support sustainable asset purchases, with the government guarantee enabling lenders to offer improved terms.

Salix Finance serves the public sector. Eligible bodies — schools, NHS trusts, local councils, universities and housing associations — can borrow the full cost of a solar installation at 0% interest through the Salix Recycling Fund, repaying from verified energy savings over 5–8 years. This scheme has deployed over £1 billion of zero-interest loans since 2004. Separate grant funding is available via the Public Sector Decarbonisation Scheme (PSDS), which can cover 30–80% of qualifying spend depending on the carbon-saving cost-effectiveness of the project.

For UK solar developers and exporters, UK Export Finance (UKEF) has pledged £10 billion of clean growth finance by 2029 and has already issued £2.3 billion of support for clean-growth transactions. UKEF-backed guarantees have enabled companies such as Hampshire-based Hive Energy to raise HSBC financing to scale solar projects internationally.

If grants and funding routes are your priority, our dedicated guide to solar panel grants and funding UK covers every active scheme, including the ECO4 and Warm Homes Plan for eligible households.

Comparing the models: a quick decision guide

Own outright (cash purchase): Best total lifetime return; full capital allowance from day one; ties up capital. Suits profitable businesses with strong cash reserves.

Hire purchase: Spreads cost; ownership and capital allowance at end of term; fixed monthly outgoing. Suits businesses that want ownership but need to preserve working capital.

Finance lease: Spread payments; no capital allowance for lessee; on-balance-sheet liability. Suits businesses for whom the capital allowance is less valuable (e.g. those in a loss position).

PPA: Zero capex; no maintenance liability; locked-in electricity discount; long contract commitment. Suits businesses with low creditworthiness or those wanting full capex avoidance.

Green loan: Flexible terms; interest deductible; full ownership and capital allowance retained. Suits businesses that can service debt and want to maximise tax relief.

Key questions to ask before signing

Before committing to any solar finance structure, your finance director or accountant should clarify: whether the lease meets the short-term or low-value exemption under the 2026 FRS 102 rules; what happens to the asset at the end of the agreement and who bears residual value risk; whether the interest rate is fixed or floating (green loans and hire purchase agreements often carry fixed rates, which matters in a volatile rate environment); and what security the lender requires — some asset finance is secured solely against the panels, while green loans may require a personal guarantee or a charge over business assets.