Is it worth getting solar panels on finance?

For most commercial projects the answer is yes — and the reason is simpler than the sales patter suggests. A well-sized commercial solar system on a roof with good daytime demand tends to generate more energy saving each month than the finance repayment costs you. When that holds, the system pays for itself out of the bills it removes, and you keep the capital you would otherwise have sunk into the roof. The honest version of the answer, though, depends on three things: the gap between your saving and your repayment, the true cost of the credit, and whether your chosen route lets your business keep the tax relief.

This guide walks through each, in pounds rather than slogans.

The core test: does the saving beat the repayment?

Whether solar panels on finance are worth it comes down to one comparison. On one side, the monthly energy saving plus any export income. On the other, the monthly repayment on the solar panel finance you arrange. If the first number is larger, the system is cash-flow positive from month one — you are paying less in total each month than you were before, while owning an asset that runs for 25 years or more.

A worked feel for it: a £120,000 commercial system on a business with high daytime load might cut grid spend by around £18,000–£24,000 a year once you account for self-consumption and exported surplus. Spread the cost over a seven-year term and the repayment often lands below that annual saving. The system is, in effect, funding itself while you keep your working capital free for stock, hiring or other projects.

The variables that move the result are your tariff, how much of the generation you use on site rather than export, the system size relative to your load, and the term. You can model your own numbers with the finance calculator before committing to anything — it is the fastest way to see whether your saving clears your repayment.

What it really costs: the total cost of credit

Financing is not free, and any guide that pretends otherwise is selling something. You pay for the use of someone else’s capital, and that cost shows up as the total cost of credit — the sum of all repayments minus the amount financed.

What matters is not the headline rate quoted in isolation but that total figure measured against the saving the system delivers. A slightly higher rate over a term that still leaves you cash-flow positive is a better outcome than an obsessive hunt for the lowest rate on a deal that never closes. The drivers of your rate are your covenant strength, the term, the security offered and the deal size — larger, stronger-covenant projects price keenest, and the total cost of credit moves with all four.

The practical rule: judge the deal on whether the saving comfortably exceeds the repayment across the term, then minimise the cost of credit within that. If the saving beats the repayment, the cost of credit is being paid by energy bills you were spending anyway — which is the real sense in which financed solar can “pay for itself”.

Keeping the tax relief — the part that decides the route

Here is where the structure you choose matters as much as the rate, because the tax treatment differs sharply between owning and renting the asset.

Solar PV is special-rate (integral-feature) expenditure. That means it qualifies for the Annual Investment Allowance (AIA) at 100% on up to £1m of qualifying spend per year, and the 50% first-year allowance on spend above that threshold. Both reliefs are permanent. One common myth worth killing: solar does not qualify for 100% full expensing — that relief is for main-rate plant only. Our capital allowances page sets out the detail with a worked example.

Who actually claims that relief depends on how you finance:

• Hire purchase, an equipment loan, or cash purchase: your business owns the asset and claims the capital allowances yourself. A solar hire purchase agreement is the classic route for a taxpaying business that wants ownership and the full allowance from day one.
• Finance lease: the lessor usually claims the allowances and passes the benefit back through lower rentals (unless it is a long-funding lease). The rentals themselves are deductible.
• Operating lease: no allowances for you as lessee, but the rentals are a deductible operating expense.
• PPA (power purchase agreement): the third-party funder owns the system, so the funder claims the allowances and keeps the Smart Export Guarantee (SEG) income from exported power. You simply buy the electricity.

This is the heart of the case for owning via asset finance rather than signing a PPA. Under a PPA you pay nothing up front, but you hand the allowances and the export income to someone else for 15 to 25 years. Owning the system — even with the cost spread over a finance term — keeps both with your business. Our asset finance vs PPA comparison models that difference over the life of a system; for most taxpaying businesses with capital allowance headroom, ownership wins on lifetime value.

VAT and the balance sheet

VAT-registered businesses can reclaim the VAT on the equipment whichever route they choose. The timing differs: hire purchase and equipment loans pay the VAT up front (and you reclaim it on your next return), whereas leases spread the VAT across the rentals. There is no domestic-style zero-rating here — that relief applies to homes, not commercial installations.

One change worth flagging for finance directors: revised FRS 102 brings most leases onto the lessee’s balance sheet for accounting periods beginning on or after 1 January 2026, with exemptions for short-term and low-value leases. In practice this narrows the old “off-balance-sheet” appeal of operating leases, so the decision should rest on the economics and the tax position rather than on keeping the asset off your accounts.

So — is it worth it for your business?

Financing is usually worth it when:

• your roof and daytime load make the system genuinely productive;
• the monthly saving plus export income clears the repayment;
• your business is a taxpayer that can use the capital allowances; and
• you would rather keep your capital working in the business than tie it up in a roof.

It is less compelling when your business pays little or no tax (the allowances are worth less to you), when site demand is too low to self-consume much generation, or when you genuinely cannot service any repayment — in which case a PPA’s zero-capex model, despite its lost allowances and export income, may be the pragmatic choice. We will tell you honestly which camp you are in.

If you would like that assessment in pounds rather than generalities, the quickest next step is a quote: give us your roof, your typical energy spend and your tax position, and we will model the routes side by side so you can see whether financing solar is worth it for you — and which structure keeps the most value with your business.