Business solar grants & funding (UK, 2026)

Why "solar grants for business" rarely means a grant cheque

Search for solar grants for business and the results promise more than the schemes deliver. The blunt truth is that broad, always-open capital grants for a private company fitting its own solar are limited, and most of the money that makes business solar stack up comes from tax reliefs and income streams, not a grant. That is not bad news. Stacked across the life of a system, the reliefs are worth far more than the one-off grants that occasionally appear, and unlike a grant you do not have to win a competitive round or catch a scheme in its open window to claim them. Understanding how they combine is more useful to your funding decision than chasing a grant that, for most businesses, does not exist.

The four benefits that stack on the same install

For a typical VAT-registered company buying a rooftop system for its own use, four benefits tend to apply at once: capital allowances on the qualifying cost, VAT reclaimed through your return, no extra business rates while the system powers your site, and export income on the units you do not use. These are not alternatives you pick between. They run in parallel, which is why the real cost of owning a system is a good deal lower than the price on the quote, and why modelling the net figure matters more than reading the sticker one.

Why solar being special-rate changes the tax you can claim

Solar PV is classed as special-rate plant and machinery, and that single fact drives the whole tax position. It excludes solar from the two most generous headline schemes: 100% full expensing and the 40% first-year allowance are both main-rate only, so neither applies. This is the point a surprising number of solar sites get wrong, and planning around a "100% write-off" that does not exist is a costly mistake. In their place, the Annual Investment Allowance does the heavy lifting, giving 100% first-year relief on qualifying spend up to £1 million a year. Because most business rooftop installs sit well under that cap, the majority still attract full first-year relief on the whole cost, worth about 25p per £1 spent at a 25% corporation tax rate. Where a company's total qualifying spend runs past the £1 million cap, the balance on the solar asset can use the 50% special-rate first-year allowance, available to companies, with the remaining value written down at 6% a year on the reducing-balance basis. The takeaway is simple: for solar, the relief is the AIA, and it follows the AIA rules, not the full-expensing headline.

VAT, business rates and export income

VAT on business solar is charged at the standard 20% rate. The 0% domestic rate does not apply to business installs, but a VAT-registered company normally reclaims that VAT through its return, so for most firms it is a cash-flow timing point rather than a permanent cost. On business rates, rooftop solar generating power for your own use is 100% exempt in England from 1 April 2022 to 31 March 2035, so self-consumption does not raise your rateable value in that window, and Scotland and Wales run separate regimes worth checking locally. For export income, the Smart Export Guarantee replaced the Feed-in Tariff, which closed to new applicants in 2019, and pays you for units sent back to the grid. Systems up to 5 MW qualify, so virtually every business rooftop or ground system is eligible. Suppliers set their own rates; indicative 2026 best rates run roughly 12 to 16.5p per unit, and the income is generally taxable for a business. Because a unit used on site displaces 26 to 32p of grid import while an exported unit earns 12 to 16p, using your own power is worth more than double exporting it, so export income is the smaller half of the economics.

How to claim, and the mistakes that cost money

The reliefs are claimed in different places, which is where businesses trip up. Capital allowances go through your corporation tax return, VAT recovery through your VAT return, the rates exemption with your local billing authority, and the SEG through a licensed electricity supplier. Keep the itemised invoice, the MCS certificate and the commissioning paperwork, because your accountant will need them. The frequent errors are assuming full expensing applies, expecting the domestic 0% VAT rate, and forgetting to register for the SEG once the system goes live. This is general information, not tax advice, so confirm your position with your accountant before you rely on any figure.

An honest map of the grant schemes

Where genuine grant funding does exist, it is narrow. Salix and the Public Sector Decarbonisation Scheme offer grants and interest-free loans, but only to the public sector: central government, the NHS, schools and academies, colleges, some universities, local authorities and emergency services. Private companies and most social housing are not eligible, however often marketing blurs the line. Some combined authorities and regional bodies run occasional energy-efficiency or net-zero grants for local businesses, but they are regional, time-limited and open and close frequently, so current availability has to be checked for your specific area rather than assumed from an old guide. ECO4 and the Great British Insulation Scheme are household schemes for low-income and vulnerable homes and do not apply to businesses at all; GBIS closed to new applications on 31 January 2026. So when a "free solar grant" advert lands in your inbox, the right question is which of these it really is, because for a private business the answer is usually none of them.

Where the real lever is, and what to do next

For most companies the reliefs above are the genuine support, and the strongest lever remains choosing the funding route that fits your cash position. We are independent business-solar-funding specialists, not a lender, installer or financial adviser. See how the routes compare on the funding options compared page, model the reliefs against the outlay with the finance calculator, and if a low-outlay start suits you, look at a no upfront cost route. For the deeper payback picture over the system's life, read payback and ROI. When the maths stacks up and you want it costed on your actual roof, we pass you to vetted MCS-certified installer and funder partners, and if you would rather compare specialist finance providers directly, commercialsolarfinance.co.uk lines up the lenders side by side.