A commercial solar lease lets UK businesses use a solar PV system with no upfront capital. The lessor owns the panels; you pay a fixed monthly rental and keep the electricity savings. This guide explains both lease types, typical costs, the tax and accounting treatment, and when leasing makes sense.
A commercial solar lease is a long-term rental agreement for a solar PV system installed on your business premises. The lessor (a specialist leasing company, bank, or structured finance vehicle) installs and owns the panels; you pay a fixed periodic rental — typically monthly or quarterly — and receive the benefit of the electricity generated.
Solar leasing removes the upfront capital requirement (typically £40,000–£200,000 for a commercial system) and transfers ownership, maintenance obligations, and residual value risk to the lessor. In return, you pay a finance cost embedded in the rental: this makes leasing more expensive over a 25-year horizon than outright purchase, but often cash-flow positive from month one.
Operating lease vs finance lease for commercial solar
The two main lease structures have different accounting, tax, and ownership consequences:
Operating lease
Under an operating lease, the lessor retains substantially all risks and rewards of ownership. The asset stays on the lessor's balance sheet; for UK GAAP (FRS 102) companies the lease is an off-balance-sheet operating expense. The lessor claims the 50% First Year Allowance, which reduces their tax cost and flows through to lower rentals. Operating leases typically run 10–20 years.
The key advantage is clean accounting: no new asset or liability appears on your balance sheet, your debt covenants are unaffected, and rental payments are simply an operating cost. The key disadvantage is that you do not own the panels at the end of the term (unless a purchase option is exercised) and you cannot claim the FYA yourself.
Finance lease
Under a finance lease, you as lessee bear substantially all risks and rewards of ownership. IFRS 16 requires the asset and lease liability to be capitalised on your balance sheet (UK GAAP FRS 102 gives more flexibility for smaller companies). You claim the capital allowances as though you owned the asset. Finance leases are shorter (5–12 years) and end with a nominal-cost purchase option or secondary period. They are closer economically to hire purchase than a true lease.
Feature
Operating lease
Finance lease
Capital purchase (loan)
Upfront cost
None
None or small deposit
None (loan) or full amount (cash)
Balance sheet
Off (UK GAAP)
On (IFRS 16 / FRS 102)
On (asset + debt)
Who claims FYA
Lessor
Lessee
Buyer
Panel ownership
Lessor throughout
Lessor; lessee bears risk
You
Typical term
10–20 years
5–12 years
7–15 years
25-yr after-tax IRR
Lower (rental cost)
Medium
Highest (ownership)
How much does a commercial solar lease cost?
Monthly rental is a function of installed system cost, implicit interest rate, and lease term. Typical rental ranges for UK commercial systems in 2026:
25kWp (small roof): £350–£550/month over 15 years
50kWp (mid-size commercial): £700–£1,100/month over 15 years
100kWp (large roof or car park): £1,200–£1,900/month over 15 years
250kWp+ (large industrial): bespoke; typically <£30/kWp/year in rental
The implicit rate on a commercial solar operating lease is typically 5–8% p.a., reflecting the lessor's cost of funding, credit risk premium, and operating costs. Rates are fixed for the lease term, giving a predictable cost base.
Worked example: 50kWp roof-mount, 15-year operating lease
Installed system cost£48,500
Lease term15 years
Implicit rate6.5% p.a.
Monthly rental~£845/month
Annual generation45,000 kWh
Annual energy saving~£12,600
Net annual benefit~£2,460/yr
Balance sheet impactNil (UK GAAP)
Figures indicative. Actual rental depends on credit profile, installer, and market rates at lease inception. See our finance calculator for a model based on your numbers.
Tax and accounting treatment
The accounting and tax implications differ significantly between lease types and applicable accounting standards:
Operating lease / UK GAAP (FRS 102): rentals are an operating expense; no asset or liability on balance sheet; lessor claims FYA or AIA
Operating lease / IFRS (listed companies): IFRS 16 requires capitalisation as right-of-use asset + lease liability, even for operating leases; depreciation and interest replace the rental expense
Finance lease: lessee capitalises under both IFRS and UK GAAP; lessee claims capital allowances (AIA or writing-down allowance); implicit interest deductible
For most private businesses on UK GAAP, an operating lease remains genuinely off-balance-sheet. Always confirm the accounting treatment with your auditor before signing.
Frequently asked questions
What is a commercial solar lease?
A commercial solar lease is a long-term agreement under which a lessor owns and installs a solar PV system on your business premises and you pay a fixed periodic rental — typically monthly or quarterly — for its use. You receive the benefit of the electricity generated (or a discounted electricity rate under a PPA variant) without needing to purchase the system outright. Leases typically run 10–20 years.
What is the difference between an operating lease and a finance lease for solar?
Under an operating lease the lessor retains ownership and residual value risk throughout: the asset stays on the lessor's balance sheet, the lessor claims the 50% First Year Allowance, and your rentals are treated as an operating expense. Under a finance lease, IFRS 16 requires you to capitalise the asset and liability on your own balance sheet, and you bear residual value risk at the end of the term. For most businesses seeking off-balance-sheet solar finance, an operating lease is the appropriate structure.
How much does a commercial solar lease cost per month?
Monthly lease costs depend on system size, term, and implicit interest rate. As a guide: a 50kWp roof-mount system (installed cost ~£45,000–£55,000) typically generates monthly rentals of £700–£1,100 over a 15-year operating lease. A 100kWp system (installed cost ~£80,000–£95,000) typically generates rentals of £1,200–£1,900 per month. The rental is fixed, so your energy cost is predictable over the full term.
Is a commercial solar panel lease off-balance-sheet?
A true operating lease can achieve off-balance-sheet treatment, but only if structured to meet the criteria: the lessor retains substantially all ownership risk and reward, the lease term does not cover substantially all of the asset's useful life, and the present value of rentals does not represent substantially all of the asset's fair value. From 2019, IFRS 16 eliminated operating lease off-balance-sheet treatment for most listed companies — private companies using UK GAAP (FRS 102) retain more flexibility.
Can I buy the solar panels at the end of a commercial lease?
Some operating lease agreements include a purchase option at the end of the term, typically at fair market value (to preserve operating lease accounting). A finance lease usually gives the lessee the right to acquire the asset for a nominal sum at the end (effectively hire purchase). If your objective is eventual ownership, a finance lease, hire purchase, or green loan may be more appropriate than a pure operating lease.
Is solar leasing better than buying solar panels outright for my business?
Buying (capital purchase with green loan or own cash) typically delivers the strongest 25-year IRR because you own the asset, claim the First Year Allowance, and eliminate the implicit leasing cost. However, leasing is better when: (1) capital preservation is the priority; (2) you cannot use the FYA (loss-making or non-taxpaying entities); (3) your balance sheet cannot absorb debt; or (4) you require a guaranteed, fixed energy cost with no maintenance liability.
How long is a commercial solar panel lease?
Commercial solar leases typically run 10–20 years, with 15 years the most common operating lease term in the UK market. Finance leases are often shorter (5–12 years) because the lessee carries the balance-sheet obligation. Some PPA agreements extend to 25 years to match the typical panel warranty period. Longer terms reduce monthly rentals but increase total cost of finance over the period.
What happens if I want to end a commercial solar lease early?
Most commercial solar leases include an early termination clause that requires the lessee to pay a break fee — typically the net present value of the remaining rentals, discounted at the lease's implicit rate. This can represent a significant sum mid-term. Early termination should be assessed before signing: negotiate a step-down schedule, a break-clause at year 5 or 10, or a lease transfer option if the property is likely to be sold.
Model your solar lease versus buying outright
We compare operating lease, finance lease, green loan, and capital purchase against your actual energy costs and tax rate. Independent — no lender commission.