Solar Panels for Holiday Lets: Tax, ROI, and What Changed

Holiday let solar has always had a different financial story from residential solar. Until recently, the tax treatment was unusually favourable. That changed in April 2025, and any content or analysis based on the old rules is now out of date.

This article covers what changed, what still works, and how to think about the ROI for a holiday let in 2026.

The critical tax change: FHL abolished April 2025

The Furnished Holiday Lettings (FHL) tax regime gave owners of qualifying holiday lets access to Annual Investment Allowance (AIA — up to £1 million). This meant the full cost of a solar installation could be written off against rental income in the year of installation. On a £10,000 system, that was a substantial immediate tax saving.

From 6 April 2025, this no longer applies.

The FHL regime was abolished entirely. Holiday lets are now treated as standard residential rental property for tax purposes. Capital improvements — including solar panels — are not deductible as allowable expenses under standard rental rules. Only revenue expenses (repairs and maintenance) qualify.

The tax case for holiday let solar has weakened materially. That does not make solar a bad investment for a holiday let — but it does mean the case now rests on operational savings rather than tax efficiency. Those savings are real.

Always speak to a qualified tax adviser about your specific position. This article provides general information only.

The operational case: still compelling

Even without favourable tax treatment, the economics of solar on a busy holiday let can be stronger than for a typical owner-occupied home. The reason is consumption pattern.

High daytime occupancy = high self-consumption

The typical commuter household self-consumes 25–35% of its solar generation — the rest is exported because nobody is home during the day. A holiday let flips this picture. Guests are present during the day: cooking, charging devices, running dishwashers, watching television, using electric showers. Occupancy during solar generation hours is high.

A self-consumption rate of 40–60% is realistic for a well-occupied holiday let — compared to 25–35% for a commuter home. More of what you generate, you use. Less is exported at the lower SEG rate.

Holiday let electricity consumption is higher than you think

A residential property uses 2,500–3,500 kWh per year on average. A busy 4–6 bedroom holiday let can easily use 8,000–15,000 kWh per year, because:

• Multiple guests using appliances simultaneously
• Hot tubs (2–4 kW continuously, running 24 hours)
• Electric underfloor heating or electric panel heaters
• Multiple televisions, games consoles, and device chargers
• More frequent dishwasher and washing machine cycles

The higher the running costs, the greater the absolute saving from solar.

EPC improvement and guest appeal

Where a holiday let requires an Energy Performance Certificate — broadly any commercially let property in England and Wales — solar raises the EPC rating and SAP score. As Minimum Energy Efficiency Standard (MEES) thresholds tighten, a better EPC increasingly protects the property's lettability.

Separately, eco-credentials are growing in significance on Airbnb, Sykes Cottages, and other platforms. Some hosts report measurably higher bookings or the ability to command a premium from environmentally conscious guests. This is hard to quantify but increasingly real.

Sizing for a holiday let: bigger than you think

The fundamental rule: size for peak occupancy, not average usage.

A standard domestic solar system is sized on the household's annual electricity consumption. For a holiday let, the peak load — when the property is fully occupied with guests — is what matters, because that is when electricity costs are highest and when solar can deliver the most savings.

Sizing rules of thumb:

• Start with a baseline of 4kWp for a 2-bedroom property
• Add 1–1.5 kWp per additional bedroom
• Add a further 1–2 kWp if there is a hot tub
• Ground-mounted systems can be worth considering for rural properties with space

Example: A 4-bedroom holiday cottage with a hot tub might need 6–8kWp to meaningfully offset running costs — double the 3–4kWp typical for a 4-bedroom family home.

If the property has electric underfloor heating throughout, a larger system and battery storage may make even stronger sense — particularly for shoulder-season lettings where some solar generation is available but electricity demand is still significant.

Battery storage for holiday lets

A battery adds another layer of complexity. For holiday lets, the case for battery storage is weaker than for owner-occupied homes, because:

• Self-consumption is already high during the day — the battery's primary job (shifting daytime generation to evening) matters less
• The property may be vacant for weeks during low season — a battery sitting idle earns nothing
• Time-of-use tariff benefits depend on having consistent overnight demand to charge from cheap rates

Where battery storage makes sense for holiday lets:

• Evening occupancy is high and electricity demand is significant — guests cooking, watching films, using the hot tub after dark
• The property is in an area with regular low-season bookings — consistent year-round demand improves the battery ROI
• Smart export / VPP income is being explored — compatible battery systems can earn grid services income regardless of occupancy

For most holiday let owners, getting the solar sizing right is the priority. Battery storage is a secondary decision.

VAT position

Holiday lets that qualify as "residential accommodation" can benefit from the 0% VAT rate on solar supply and installation, the same as owner-occupied homes. This rate applies until 31 March 2027.

If the property is used exclusively as a commercial enterprise (not as a home), a different VAT position may apply.

SEG eligibility

Holiday let installations are eligible for the Smart Export Guarantee (SEG) if:

• The installation is MCS-certified
• A half-hourly export meter is in place
• The property has a qualifying electricity supplier

In practice, self-consumption is more valuable than SEG export for busy holiday lets — you avoid paying the full import rate rather than earning the lower export rate. SEG becomes more relevant during low-season periods when the property sits empty and surplus generation has nowhere to go.

The bottom line for 2026

The FHL tax advantage is gone. The operational case — lower running costs, higher self-consumption, EPC improvement, guest appeal — remains solid for properties with substantial electricity consumption.

If your holiday let has a hot tub, electric heating, or high-occupancy periods, the solar economics are likely to work. Size the system for peak occupancy, get a proper quote from an MCS-certified installer, and take current tax advice before including any tax savings in your projections.

The old guides saying "solar pays off in 3–4 years thanks to AIA" are outdated. The new honest answer is: the payback is longer without the tax benefit, but the running cost savings are real, and for a high-consumption property they add up.

Share this article