Solar finance for SMEs under £100k

Most commercial solar coverage assumes a warehouse roof and a six-figure budget. The reality for the average UK SME is smaller: a 30kWp to 80kWp array on a workshop, retail unit, care facility or office, costing somewhere between £25,000 and £100,000 installed. At that size the finance question is different. The deal is too small for the heavy structuring some funders apply to large projects, and too large for most directors to want to drain working capital. This guide is for finance directors and owner-managers looking at SME solar finance under £100k, and it sets out what is actually available, how it is priced, and how to structure it so the system pays for itself rather than becoming a drag.

What “under £100k” buys and why the route matters

A typical SME installation in this bracket delivers meaningful, predictable savings: a 50kWp system might cut £8,000 to £14,000 a year off an electricity bill, depending on tariff and how much of the generation you use on site. The point of financing is not to avoid the cost but to spread it so the monthly repayment sits below the monthly saving from day one. Get the structure right and the system is broadly self-funding; get it wrong and you have simply added a cost line.

The route you choose also decides who keeps the tax relief and the export income. That is the single most important decision in small business solar finance, and it is where a power purchase agreement quietly costs you more than it looks. We cover the comparison in full at /asset-finance-vs-ppa/, but the short version is that owning the asset — through an equipment loan or hire purchase — keeps the capital allowances and the Smart Export Guarantee income inside your business, where a PPA hands both to the third-party funder.

The default route under £100k: an unsecured equipment loan

For most SMEs in this size band, the cleanest answer is an unsecured equipment loan. You borrow the project cost, own the system from day one, and repay over a fixed term — typically five to seven years. Because you own it, your business claims the capital allowances and receives the export income directly.

The attraction over secured lending is speed and simplicity. There is no charge over property, no debenture in most cases, and decisions are quick — often an indicative offer inside 24 to 72 hours once a lender has your last set of filed accounts and management figures. Deals from around £25,000 are routine. We arrange these across the whole of the market rather than tying you to one funder, which matters when covenant strength varies; the headline mechanics are set out at /solar-panel-finance/.

Growth Guarantee Scheme backing for younger businesses

If your business is newer, or your balance sheet is thinner than a lender would like, the loan does not automatically stop. The government-backed Growth Guarantee Scheme provides participating lenders with a 70% guarantee on eligible facilities, which lets them say yes to SMEs they might otherwise decline. You remain fully liable for the debt — the guarantee protects the lender, not you — but it widens the pool of fundable businesses considerably. It is one of the most useful tools for SME solar finance under £100k and is worth raising early in any application.

Hire purchase as the ownership alternative

Hire purchase reaches the same destination as an equipment loan — you own the system at the end — but structures it as instalments toward title rather than a loan secured on nothing in particular. For solar specifically, ownership is what unlocks the tax position. Solar PV is special-rate (integral-feature) expenditure, so it qualifies for the Annual Investment Allowance at 100% on up to £1m of qualifying spend a year, comfortably covering any sub-£100k SME project. Above the AIA cap, the 50% first-year allowance applies. Both reliefs are permanent.

One common error worth correcting: solar does not qualify for 100% full expensing. Full expensing applies only to main-rate plant and machinery. Solar sits in the special-rate pool, which is why the route is AIA at 100% up to the cap, then 50% FYA above it. The practical effect for an SME is the same — a sub-£100k system financed by HP or loan is almost always fully relieved in year one through the AIA. The detail, with a worked example, sits at /capital-allowances/.

VAT is reclaimable by VAT-registered businesses whichever route you pick. With HP and equipment loans you pay the VAT up front and reclaim it on your next return; with a lease, the VAT is spread across the rentals instead.

Where leasing fits for smaller projects

A lease is worth considering in two situations. If your business is not currently profitable enough to use the capital allowances, owning the asset gives you a tax benefit you cannot absorb. In that case a finance lease can make sense, because the lessor claims the allowances and passes the benefit through as lower rentals. An operating lease, where you never take ownership, gives no allowances to your business but the rentals are fully deductible as a trading expense, which can suit a business that wants the kit off its own ledger.

Be aware of the accounting change coming in. Revised FRS 102 brings most leases onto the lessee’s balance sheet for accounting periods beginning on or after 1 January 2026, recognised as a right-of-use asset and a corresponding liability. Short-term and low-value leases are exempt, but many solar leases will not qualify for those exemptions, so the off-balance-sheet appeal that historically drew some businesses to operating leases is largely gone. If your covenants reference gearing, factor this in before choosing a leasing route.

Matching the term to the saving

The discipline that makes SME solar finance work is simple: match the repayment term to the bill saving so the deal is cash-flow positive or close to neutral from the first month. If a 50kWp system saves £11,000 a year and the financed repayment over six years runs to roughly £10,000 a year, the system pays for itself across the term and then delivers free generation for the remaining fifteen-plus years of panel life. A shorter term lifts the monthly cost but cuts the total cost of credit; a longer term eases cash flow but costs more overall. There is no universally correct answer — it depends on how tight your working capital is and what return you would otherwise earn on the cash.

Run your own numbers before you speak to anyone. Our finance calculator lets you test term lengths against an estimated saving so you arrive at the conversation knowing the shape of the deal you want rather than accepting the first structure offered.

What to have ready

Approval at this size is quick when the paperwork is in order. Lenders will want your most recent filed accounts, recent management figures, and a clear quote for the installation. A short note on expected savings — annual kWh generated, how much you will self-consume, and the resulting bill reduction — strengthens the application by showing the project pays for itself rather than relying on covenant alone.

Bringing it together

For an SME spending under £100k, the strongest position is usually ownership via an equipment loan or hire purchase, with the term matched to the saving, the Growth Guarantee Scheme in reserve if covenant is thin, and the capital allowances and export income kept inside the business. Leasing has a place where the tax relief cannot be used, but for most profitable SMEs owning the asset is both cheaper over its life and simpler to account for.

If you would like an indicative structure and monthly figure for your project, request a quote with your installation cost and last set of accounts, and we will come back with whole-of-market options matched to your covenant and cash flow.