AIA for solar in London
London businesses across all structures (limited companies, partnerships, sole traders) use AIA as the primary tax relief on commercial solar capex up to £1m per year. AIA is the only 100% first-year route available to unincorporated businesses.
Annual Investment Allowance for London businesses
| Headline value | Up to £1m year-one deduction |
| Eligibility | All UK businesses — limited companies, partnerships, sole traders, LLPs |
| Typical benefit | £19k-£450k effective tax saving depending on rate band |
| Regional context | London — London |
The London funding stack
London commercial solar projects typically combine Annual Investment Allowance with:
- Other UK-wide reliefs: AIA (if not using Full Expensing), Smart Export Guarantee, REGO sales above 50kWp
- Regional schemes: Mayor of London Business Climate Challenge, London Energy Efficiency Fund
- Sector-specific grants: See the sectors hub for IETF, PSDS, FETF and charity-sector funding routes
- Finance routes: Asset finance, operating lease, PPA — see finance hub
London commercial context
London businesses typically operate in the London commercial energy market with import rates around £0.22-£0.30 per kWh in 2026 — making the value of Annual Investment Allowance compelling regardless of sector. The London location guide covers council net zero plans, industrial estates and regional scheme administrators in detail.
Next steps for London businesses
- Read the full Annual Investment Allowance guide for eligibility, application process, worked examples and watch-outs.
- Browse the London location guide for regional scheme specifics.
- Compare cost & payback for your system size at the cost hub.
- Run the eligibility calculator — 60 seconds to confirm exactly which schemes apply to your business.
Free eligibility check · London
Tell us your business — we map every active 2026 grant to your sector, size and postcode.
Annual Investment Allowance in London · FAQs
Does Annual Investment Allowance apply to London businesses in 2026?
Yes. Annual Investment Allowance is a UK-wide scheme administered by HMRC via the corporation tax return. London businesses access Annual Investment Allowance on the same eligibility basis as any other UK location. See the full Annual Investment Allowance guide.
How does Annual Investment Allowance stack with London regional grants?
London businesses can combine Annual Investment Allowance with regional schemes specific to the London region — most prominently Mayor of London Business Climate Challenge, London Energy Efficiency Fund. Stacking is subject to subsidy control rules (£315k cumulative ceiling over 3 years) but most projects fall comfortably within the cap.
How much can a London business save?
£19k-£450k effective tax saving depending on rate band. Combined with London's typical commercial electricity rate (£0.22-£0.30/kWh) and the available regional schemes, total project economics deliver 3-6 year post-tax payback for most London commercial solar projects.
What's the application process from London?
Claimed automatically through your corporation tax return (CT600) at year-end — no separate application.
Where are London commercial solar installations concentrated?
London commercial solar is most active across the city's industrial estates and business parks. See the dedicated London location guide for industrial estate breakdowns and council climate framework details.
Check if your London business qualifies
Free 60-second eligibility check confirms whether Annual Investment Allowance applies to your business and how to stack it with London regional schemes.
Free eligibility check Or call 0800 246 1132