Insights for commercial solar finance.
Working editorial on tariffs, allowances, the macro backdrop, and the practical mechanics of structuring commercial solar projects in the UK. No vendor pieces — just working numbers and what they mean.
Solar panel loans for business: how they differ from personal and green loans
The credit rules, the tax result and the lenders differ once a company, charity or public body is the buyer.
Is interest on a solar loan tax deductible for a UK business
Interest on a business solar loan is normally deductible on top of capital allowances. The £2m group limit, hire purchase and who gets no relief.
How a financed solar array is accounted for: owned, hire purchase, lease or PPA
Owned, hire purchase, lease or PPA: how each shows in the accounts, with IFRS 16 and FRS 102 from 2026, depreciation and deferred tax.
Is there a business tax credit for solar panels in the UK?
No credit exists; capital allowances do the job. What the £1m Annual Investment Allowance is worth and who can claim it.
Commercial solar financing in 2026: what lenders check before they say yes
Bank Rate 3.75%, the Growth Guarantee Scheme, the FCA perimeter and the five documents credit teams read first.
Capital allowances on solar panels: three worked examples by business size
A £60k sole-trader install, a £200k company array and a £1.5m system above the AIA limit, with the arithmetic shown.
Is there VAT on solar panels? Two answers and one date
Homes and charity buildings used solely for non-business purposes 0% to 31 March 2027; businesses 20%, recoverable if VAT-registered; the battery rule and the electricity-bill change.
“Commercial solar funding” in 2026 means finance, not grants: the four nations compared
Grants closed; the reliefs remain and three of them differ by nation.
Leicestershire commercial solar: what the DESNZ local-authority data says
7,558 sites and 29.1 MW in the city, up 38% since 2020 — and the corridor roofs are still bare.
What a Tunbridge Wells commercial roof actually yields: PVGIS by pitch and month
1,062 kWh/kWp at 35°, 964 at 10°; a third as much in December as June.
Same array, three quotes: how commercial solar finance companies price a 100kWp deal in 2026
Bank Rate at 3.75%, margins, fees and the ownership line that decides which quote wins.
HMRC CA22335 explained: why solar panels are special-rate plant
One paragraph of the manual decides which reliefs solar can and cannot use.
Why commercial SEG rates are lower than the headline tariffs
The 20p rates are capped under 30kW; what a 300kWp roof actually earns, and the routes that pay more.
UK regional solar funds compared 2026 — all 30+ programmes
Comprehensive table of UK regional commercial solar funding — combined authorities, Investment Zones, devolved-nation schemes, foundation grants, innovation funding.
Battery retrofit on existing commercial solar — when it works and when it doesn't
Battery retrofit on existing commercial solar — inverter compatibility, DNO consent, project economics, and the scenarios where retrofit makes sense.
Half-hourly data and solar sizing: a modelled example of how the right size moves IRR by 4 points
A modelled example, not a client case: how half-hourly demand data can move the best solar size and IRR for a site with overnight load.
NHS Trust PSDS Phase 4 application strategy: a retrospective
NHS Trust PSDS Phase 4 retrospective — bundles, multi-site portfolio bids and the scoring patterns in awarded bids.
Year-end tax planning for solar panels: when spend counts for capital allowances
When spend counts for capital allowances, and how the accounting period decides the claim.
Capital allowances for solar across the recent Budgets: what changed and what did not
What full expensing, the 50% first-year allowance and the AIA mean for commercial solar.
Solar carport economics in 2026 — when the second-storey roof is worth it
Commercial solar carport economics in 2026. Capex premium versus rooftop, EV charging integration, scenarios where carports beat rooftop.
Solar export limits in the UK 2026 — when the DNO becomes the binding constraint
UK DNO export consents are increasingly the binding constraint on commercial solar sizing — particularly on industrial estates with limited grid headroom.
After-tax IRR modelling: what installer brochures get wrong
Installer brochures routinely quote 25-year IRRs of 25–35%. Our modelling on the same projects produces 14–20%.
Where commercial electricity tariffs are heading in 2026
Wholesale, network charging, and policy costs decomposed for 2026 commercial electricity tariffs.
AIA vs FYA detailed comparison — when each wins for commercial solar
Detailed comparison of Annual Investment Allowance vs 50% First Year Allowance for UK commercial solar with worked numbers.
Capex vs PPA: a decision tree for commercial solar in 2026
A structured decision framework for choosing between capital purchase and Power Purchase Agreement.
PSDS Phase 4: what the funded applications showed
Working notes from the PSDS Phase 4 application window: cost-per-tonne thresholds, common scoring failures.
MEES-driven commercial solar — refurbishment windfall in 2026
How the Minimum Energy Efficiency Standards (MEES) framework drives commercial property solar deployment.
When battery storage actually changes the solar finance case
Battery economics for commercial solar in 2026: time-of-use exposure, export-limit relief, capacity market access.
The landlord-tenant solar split: structures that actually work
Three workable solutions to the landlord-tenant capex/benefit split for commercial solar.
Why half-hourly demand data changes the system size answer
Designing commercial solar by half-hourly demand profile rather than headline annual consumption.
Smart Export Guarantee tariffs Q1 2026: a cross-supplier comparison
Smart Export Guarantee tariff comparison across the major UK licensed suppliers in Q1 2026.
Frequently asked questions
What topics does the Commercial Solar Finance insights section cover?
How does the FYA interact with different commercial solar finance structures?
What is the current UK grid carbon intensity and why does it matter for solar?
How often are the commercial solar finance insights articles updated?
Commercial solar finance insights: analysis and commentary
Our insights section provides in-depth analysis of commercial solar finance trends, policy changes, and market developments. Written for finance directors, energy managers, and sustainability leads, these articles go beyond headline news to examine what policy and market changes mean for your solar investment decision.
Featured insights
AIA vs 50% FYA: detailed comparison for 2026
Analysis of when Annual Investment Allowance and 50% First Year Allowance each apply, with worked examples for systems ranging from 100kWp (£88,000) to 2MWp (£1.5m). Covers the £1m AIA threshold, group company AIA sharing, and strategies for maximising first-year tax relief on large installations.
Battery retrofit for existing solar installations 2026
Analysis of the economics of adding battery storage to existing commercial solar installations, including half-hourly demand modelling, SEG arbitrage opportunities with Octopus Agile, demand response revenue, and asset finance options for battery additions. Case studies from logistics, manufacturing, and NHS sites.
NHS PSDS Phase 4 application strategy
A retrospective on NHS trust PSDS Phase 4 bids: the criteria, the scoring and the weaknesses that sank bids. PSDS closed to new applications in November 2024.
Commercial solar carports: economics in 2026
Comprehensive analysis of solar car park canopy economics — construction costs per kW, shading profiles, EV charging integration revenue, planning requirements, and finance structures for car park solar projects. Includes comparison of steel vs membrane canopy structures.
CapEx vs PPA decision tree
A structured decision framework for commercial solar finance selection, incorporating credit profile, lease/ownership status, tax position, AIA benefit, cash availability, and long-term strategic goals. Interactive tool with worked examples for common business scenarios.
Recent policy and market developments
AIA permanent confirmation
HMRC confirmed the £1m Annual Investment Allowance is now permanent (previously subject to annual reconfirmation). This removes the timing risk that previously encouraged businesses to rush installations before year-end to secure AIA. Businesses can now commit to solar on their own schedule without AIA cliff-edge concerns.
PSDS closed: Phase 4 is the final phase
PSDS Phase 4 was confirmed for financial years 2025/26 to 2027/28, and the Phase 4 window closed on 25 November 2024. PSDS closed to new applications in November 2024 and no new round has been announced.
SEG market competition increasing
The Smart Export Guarantee market has matured with increasing competition between suppliers. Octopus Agile export now pays average 6–12p/kWh vs the 3p/kWh floor from most suppliers. For commercial solar owners with battery storage, smart SEG selection adds meaningful income over 20-year system life.
Staying current with commercial solar finance
The commercial solar finance landscape evolves continuously — driven by Bank of England rate decisions (affecting green loan pricing), government spending reviews (affecting public-sector decarbonisation funding), HMRC Capital Allowances guidance updates, and SEG market competition. Our insights are updated regularly to reflect these changes.
For a question about how current market conditions affect your project, send it to us; we reply by email.
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