Business solar finance FAQs

There are six main routes: buy outright from cash, a business or green loan, hire purchase, asset finance, an operating lease, or a Power Purchase Agreement. Owning the system, through cash, a loan or hire purchase, keeps all the savings, export income and tax relief. A PPA or lease needs little or no capital but the funder keeps the asset and the relief. The right one depends on your cash position, tax profile and how long you will hold the building, which is what the comparison and calculators here are for.

Yes. Either a PPA, where a funder owns the system and you buy the cheaper power, or 100% finance, a green loan, hire purchase or lease repaid from the energy saving. Both aim to be cash-flow positive from day one. The trade-off is that zero upfront usually means giving up some ownership, tax relief or lifetime return, so it is worth modelling the true cost of each rather than just chasing the £0 headline.

Often yes, if the annual saving plus any export income beats the annual finance or PPA cost, which is the whole self-funding case. Whether it works for you depends on system size versus your consumption, your unit price, how much power you use on site and the finance rate, so it has to be modelled for your building. The finance calculator here shows the monthly payment next to the monthly saving so you can see the net position before you commit.

For most installs the Annual Investment Allowance gives 100% first-year relief up to £1m, which at 25% corporation tax returns about 25p per £1 spent in year one. Solar is special-rate plant, so above the £1m cap a company can use the 50% first-year allowance with the balance written down at 6% a year. Solar does not qualify for 100% full expensing, which is main-rate only, so plan around the AIA and confirm with your accountant.

Own it if you have or can borrow the capital and want the maximum return, because ownership keeps every pound of saving, the export income and the tax relief. Use a PPA if you cannot commit capital, want no maintenance risk and will hold the building long enough to benefit, accepting a lower lifetime return in exchange. A middle path, hire purchase or a green loan, lets you own the asset and claim the relief while still paying monthly.

Real capital grants for private business solar are limited. The main ongoing incentive is the Smart Export Guarantee, which pays you for exported electricity. Salix and the Public Sector Decarbonisation Scheme are public-sector only, and some regional business grants appear intermittently so are worth checking for your area. ECO4 and GBIS are domestic-only and do not apply to businesses, so treat 'free solar grant' marketing with care.

An operating lease traditionally did, but under current accounting rules most leases now sit on the balance sheet, and a finance lease and hire purchase are on it too. If off-balance-sheet treatment is the reason you are considering a lease, confirm the current position with your accountant first, because it can no longer be assumed.

Yes. Under hire purchase you are treated as the owner from the start, so you claim the AIA or 50% first-year allowance on the full cost in year one even though you pay in instalments. The interest element is separately deductible. It is one of the main reasons owners choose HP over a lease or PPA when they want both the relief and a spread cost.

If you are VAT-registered, yes. The 20% input VAT is reclaimable through your normal VAT return, provided the system is for business use and you hold a valid VAT invoice. The 0% domestic rate does not apply to business installs, so for most firms the VAT is a timing item rather than a real cost.

It depends on the route: hire purchase and asset finance are commonly 3 to 7 years, business and green loans 3 to 15 years, PPAs 10 to 25 years, and leases about 5 to 15 years. Rates are priced off the Bank of England base rate plus a margin for your business's credit strength, so live pricing moves with rates and your covenant strength and is worth quoting close to the decision.

No. In England, qualifying rooftop solar for self-consumption is 100% exempt from business rates from April 2022 to March 2035, so it will not raise your rateable value in that window. Scotland and Wales run separate regimes, so check the local position.

Line them up on the same measures: upfront cost, the monthly or annual payment, who owns the asset, whether it is on or off balance sheet, who gets the tax relief and export income, the total cost over the term, and the lifetime return. A low monthly figure can hide a high lifetime cost, so compare the whole picture, which is how the comparison table here is laid out.

Then don't. A PPA installs the system at zero capital cost and you just buy cheaper power, or 100% hire purchase, asset finance or a green loan lets you own it while repaying from the energy saving, often cash-flow positive from the first year. The calculators here model every route against your own bill so you can see what each one costs before you talk to anyone.

Over the full life, usually yes. A PPA gives the lowest day-one cost but the lowest lifetime return because the funder's margin comes out of your saving. Buying outright returns the most; finance sits in between. The right answer depends on your cash position and how long you will hold the building, which is exactly what the comparison here is for.

It does not. Solar PV is special-rate plant, and full expensing is for main-rate assets. Solar still qualifies for the Annual Investment Allowance, which gives 100% first-year relief up to £1m and covers most installs, and for the 50% special-rate first-year allowance above that. It is a common and costly mistake to plan around full expensing, so confirm your position with your accountant.

Model it before you commit. Put your actual annual electricity spend and unit price into the finance calculator and it shows the monthly finance or PPA cost next to the projected monthly saving, so you can see the net cashflow in year one rather than trust a generic promise.