No Upfront Cost Commercial Solar: How Fully Funded Works

What “no upfront cost” actually means

A no upfront cost commercial solar deal removes the capital barrier. Instead of writing a cheque for the full install, your business either lets a funder own the system and buys the electricity it produces, or borrows the full amount and repays it over a set term. Both approaches get panels on your roof for zero day-one outlay. What differs is who owns the asset, who claims the tax, and what you keep at the end.

Getting this right matters because the ownership question drives the whole economic case. This guide explains the two main zero-capex models honestly, including what you give up, so you can weigh them against buying outright. When you want numbers against your own roof and usage, our finance calculator and costed quotes do the maths across every route.

The two zero-capex routes

There are two genuinely no-upfront structures. Everything else with a low deposit is a variation on finance.

Route 1: Power Purchase Agreement (PPA)

Under a PPA a third party funds, owns, and maintains the system on your roof. You sign a long agreement, usually 15 to 25 years, to buy the electricity it generates at an agreed unit rate, typically below your grid tariff. You pay nothing for the kit and nothing for maintenance. The funder takes the ownership benefits.

Route 2: 100% finance (you own it)

Here you own the system from day one but fund it through a loan or asset finance facility covering the full cost. You make fixed repayments, usually over 3 to 7 years, priced off the base rate plus a lender margin. Once the term ends, the asset is yours and the electricity is effectively free apart from maintenance. This is how most owner-occupiers reach the strongest long-term return without touching cash reserves.

The tax: this is where the routes diverge

Ownership decides who gets the allowances, and solar sits in a specific tax category that is easy to get wrong.

Solar PV is special rate plant. That means it does not qualify for 100% full expensing (main-rate assets only) or the newer 40% first-year allowance. It does qualify for the Annual Investment Allowance (AIA), which gives 100% first-year tax relief on qualifying plant up to £1m a year. Most commercial installs sit well under that cap, so in practice an owning business can usually write off the full cost against taxable profits in year one.

If your spend on qualifying plant exceeds the £1m AIA cap, the amount above it can use the 50% special-rate first-year allowance (companies only), with the remaining balance written down at 6% a year on the reducing-balance basis.

A few more numbers that hold across both routes:

• VAT on commercial solar is 20%, and VAT-registered businesses can reclaim it. The 0% domestic rate does not apply to commercial installs.
• Business rates: rooftop solar used for self-consumption is 100% exempt in England from April 2022 to March 2035.
• SEG (Smart Export Guarantee) pays you for exported power and replaced the old Feed-in Tariff. Systems up to 5 MW are eligible.

The catch with a PPA is simple: because the funder owns the asset, the funder gets the AIA and the export income, not you. You get cheaper electricity and none of the capital-allowance benefit. If your business is profitable and can use the AIA, that is a real cost of going the PPA route.

This is general information, not tax advice. Confirm your own position with your accountant before relying on any allowance.

Side by side

Feature	PPA (funder owns)	100% finance (you own)	Capital purchase
Upfront cost	None	None	Full system cost
Who owns the asset	Funder	You	You
Claims the AIA	Funder	You	You
Keeps SEG export income	Funder	You	You
Ongoing cost	Pay per unit used	Fixed repayments	Maintenance only
Typical term	15 to 25 years	3 to 7 years	None
Best long-term return	Lower	Higher	Highest

The pattern is consistent. A PPA is the easiest to enter and the lightest on your balance sheet, but it hands the ownership upside to someone else for two decades. Full finance costs you interest but keeps the tax relief, the export income, and a fully owned asset once the term ends.

What you give up with each

With a PPA you give up ownership, the capital allowances, and most of the SEG income for the life of the contract. You are locked into a long unit-rate agreement, and exit or buy-out terms need reading carefully before you sign. The trade for that is genuinely zero risk on hardware and maintenance.

With 100% finance you take on a repayment obligation and pay interest across the term. In exchange you keep every ownership benefit, and once the facility is cleared your generation cost drops to near zero. For a business that intends to stay in the building, this usually wins on total return.

To see how each route affects your own payback, our finance options compared page sets them out in full, and payback and ROI shows the break-even timing for owned systems.

Which route suits which business

If your business is profitable, plans to stay put, and can absorb fixed repayments, 100% finance or hire purchase tends to deliver the best outcome because you capture the AIA and end up owning the system. If cash flow is tight or you want the maintenance risk removed entirely, a Power Purchase Agreement or an operating lease keeps everything off your day-to-day budget. Public sector bodies should also check dedicated decarbonisation funding such as Salix, which is public sector only.

The honest answer is that no single route wins for everyone. It depends on your tax position, how long you will occupy the site, and how much of the ownership upside you want to keep. That is exactly the comparison worth running before you commit.

Get costed quotes across every route

We are a comparison and quote service, not a lender or financial adviser. We connect UK businesses with vetted MCS-certified installers and funders, then put the numbers for each funding route in front of you so you can compare like for like.

If you want to see what a no upfront cost deal looks like against buying outright, start with a free costed quote or run your figures through our finance calculator. Both take a few minutes and let you judge the full picture, capital, tax, and return, before you sign anything.