The UK government's approach to warehouse solar funding in 2026 is dominated by tax relief rather than direct grants — but the combined effect of 100% Annual Investment Allowance, 50% First Year Allowance, Freeport Enhanced Capital Allowances, and sector-specific schemes means effective public funding of 25-50% of capex for most commercial installations.
100% Annual Investment Allowance (AIA)
The workhorse of warehouse solar funding. 100% of qualifying capex (up to £1m per company per tax year) is deducted from taxable profits in the year of installation. At 25% corporation tax: £250k year-one tax saving on a £1m install. The AIA was permanently set at £1m in the Spring Budget 2024. For group companies: AIA is per qualifying entity — a group with multiple subsidiaries can each claim £1m AIA.
50% First Year Allowance (FYA)
For capex above the £1m AIA cap, 50% FYA applies in year one. A £1.8m install: £1m at 100% AIA + £800k at 50% FYA = £1,000,000 + £400,000 = £1,400,000 deductible in year one. At 25% corporation tax: £350,000 year-one tax shield on a £1.8m install.
Freeport Enhanced Capital Allowances
Within UK Freeport designated zones (Felixstowe & Harwich, Liverpool, Plymouth, Teesside, Solent, Thames, Humber, East Midlands Airport, Welsh Freeport), 100% Enhanced Capital Allowances are available on plant and machinery — on top of standard AIA. For eligible Freeport warehouse operators: potential year-one tax shield of 30-50% of project capex. Example: £2m project within Teesside Freeport zone; £500k year-one tax shield at 25% corporation tax.
IETF (Industrial Energy Transformation Fund)
IETF Phase 3 (latest round, 2024-2026) provides capital grants of 30-50% of eligible project cost for energy efficiency and fuel switching. Eligible operators: large industrial energy consumers including cold chain, food processing, chemicals, ceramics, paper, metals, glass. Minimum project value: £100,000. Maximum award: £10m. Requires ESOS energy audit finding that supports solar as a positive recommendation. Application process: 3-stage (expression of interest, full application, agreement). Typical timeline: 12-18 months from EOI to grant payment. We support IETF applications alongside commercial solar projects.
UK Shared Prosperity Fund (UKSPF) and successor
Some Local Authorities and LEPs are using UKSPF allocations for commercial solar co-investment programmes. Coverage varies significantly by area. Active programmes in 2026 include: Cornwall and Isles of Scilly (up to £50,000 co-investment for SMEs); Tees Valley (commercial energy efficiency programme); South Yorkshire MCA (green business grant up to £100,000 per project). Check your Local Enterprise Partnership website.
Zero VAT on commercial solar
Since April 2022, installation of solar PV on commercial premises has been subject to 0% VAT (reduced from 20% prior). On a £900,000 install, zero-VAT saves £180,000 versus the pre-2022 position. This is automatic — no application required.
Worked example: 1 MW distribution centre, East Midlands Airport Freeport
System cost: £800,000. AIA: 100% × £800,000 = £800,000 deductible. Tax shield at 25%: £200,000 year-one tax saving. Zero VAT: £0 VAT versus £160,000 pre-2022. Net effective cost after tax shield: £600,000. Annualised cash saving years 1-25: £147,000/yr. Simple payback on effective capex: 4.1 years. After-tax payback: 3.1 years.
See more
Full capital allowance methodology: /guides/warehouse-solar-capital-allowances/. Full cost economics: /warehouse-solar-costs/. Tax allowance worked examples: /guides/warehouse-solar-tax-allowances/.