0% and no-deposit solar finance: the truth

Search for “0% solar finance” and you will find plenty of headline offers. Search a little harder and you will find the catch. Genuine 0% finance is rare in commercial asset finance, and “no deposit” is common but not the bargain it sounds like. This guide explains where the cost actually sits, how to judge an offer honestly, and why a well-structured deal can make solar effectively pay for itself even when the rate is not zero.

Is there really 0% solar finance for business?

A true 0% deal means the lender earns nothing on the money it advances. That does happen in consumer and public-sector lending — Salix interest-free loans for schools and the NHS are real — but in mainstream business asset finance it is unusual. When you see 0% advertised against a commercial install, the cost has almost always been moved somewhere you can see it less easily.

The most common arrangement is subsidised or “buy-down” finance, where the installer pays the lender an upfront fee to discount the rate, then recovers that fee inside the equipment price. You pay 0% on the borrowing and a slightly higher price on the kit. The total you hand over can be identical to a transparent deal at a normal rate. Sometimes it is more, because a padded price also inflates the VAT and the figure you depreciate.

This is not a scam — bundling the cost of credit into the price is a legitimate, widely used model. The point is simply that 0% does not mean free. As a broker we will quote the genuine cost either way, but you should always ask the same question of any offer: what is the total amount payable over the term, and how does the equipment price compare with a like-for-like cash quote?

No deposit is normal, not a discount

“No deposit” is a much more honest claim, and far more common. Most commercial solar finance — hire purchase, equipment loans and finance or operating leases — can be arranged with nothing down, so your capital stays in the business. That is the core appeal of asset finance: the system earns from day one while you spread the cost over its working life.

What no deposit does not do is change the price of the asset or the cost of credit. It changes the shape of your cash flow, not the total. A nil-deposit deal usually carries a marginally higher amount payable than one where you put money in up front, because the lender is financing 100% of the cost for the full term. That trade — slightly more interest in exchange for keeping your cash — is often worth making, but it is a trade, not a freebie.

Judge every offer by the total cost of credit

The headline rate, the deposit and the monthly figure are all easy to dress up. The number that cannot be dressed up is the total cost of credit: the sum of every payment over the term, minus the cash price of the equipment. That single figure lets you compare a 0% buy-down quote, a no-deposit hire purchase and a conventional lease on the same basis.

To compare properly you need three things side by side:

• the cash price of the same specified system (panels, inverters, battery, install)
• the total amount payable under each finance offer over its full term
• the tax position of each route, because the after-tax cost is what actually lands on your P&L

Our cost guide walks through what a commercial system genuinely costs before finance, and the finance calculator lets you model the monthly and total figures for each structure so you are comparing real numbers rather than marketing.

Why the tax position changes the maths

How you finance the system decides who keeps the capital allowances, and that materially changes the real cost.

Solar PV is special-rate (integral-feature) expenditure. It qualifies for the Annual Investment Allowance at 100% on up to £1m of qualifying spend a year, and the 50% first-year allowance on anything above that. It does not qualify for 100% full expensing — that relief is for main-rate plant only. Both the AIA and the 50% FYA are permanent reliefs.

The route you choose decides who gets them:

• Hire purchase, an equipment loan or a cash purchase mean the business owns the asset and claims the allowances itself.
• A finance lease usually leaves the allowances with the lessor, who passes the benefit back through lower rentals (unless it is a long-funding lease).
• An operating lease gives the lessee no allowances, but the rentals are fully deductible.
• A PPA hands the allowances and the Smart Export Guarantee income to the third-party funder.

That is the crux of the “free solar” comparison. A PPA can look like zero-cost solar because there is no capex and no deposit at all — but the funder keeps the tax relief and the export income, and prices its margin into the unit rate you pay for power. Owning the system through asset finance keeps the allowances and the SEG income inside your business. Our asset finance vs PPA comparison sets out where each one wins, and the capital allowances page works through the relief in pounds.

What actually makes financed solar “free”

The honest version of “solar that pays for itself” has nothing to do with the interest rate being zero. It is about the energy saving plus export income exceeding the finance repayment.

A well-sized commercial array displaces grid electricity you would otherwise buy, and exports the surplus under the Smart Export Guarantee. On a project matched to your daytime load, the monthly saving plus export receipts frequently covers — and often beats — the monthly finance payment from the first quarter. At that point the system is genuinely cash-flow positive while you are still paying for it: the saving services the debt and you keep the difference. When the term ends, you own an asset that goes on saving for the rest of its 25-year-plus life.

That is the real “no deposit, pays for itself” story, and it does not depend on a 0% gimmick. It depends on three things: a system sized to your consumption, a term matched to the life of the saving, and a structure that keeps the allowances and export income with you.

One accounting change to note

From accounting periods beginning on or after 1 January 2026, the revised FRS 102 brings most leases onto the lessee’s balance sheet as a right-of-use asset and a lease liability (short-term and low-value leases are exempt). If keeping debt off the balance sheet was part of the appeal of an operating lease, that advantage largely disappears for new agreements. It is worth factoring into any covenant or gearing conversation when you choose between owning and leasing. VAT, meanwhile, is reclaimable by VAT-registered businesses either way — hire purchase and loans let you reclaim it up front, while leases spread it across the rentals.

The bottom line

Treat 0% as a flag to check the equipment price, treat no deposit as the normal, useful thing it is, and judge every offer on the total cost of credit after tax. Do that and the route that genuinely makes solar pay for itself is usually ownership through asset finance — with the allowances, the export income and a long-lived asset all kept inside the business.

If you would like us to model a no-deposit deal against a cash purchase and a PPA on your actual numbers, request a quote and we will return honest, like-for-like figures with the total cost of credit shown in full.