Quick answer: A typical UK home solar system pays for itself in roughly 7 to 11 years in 2026. A 4kW array costs around £6,200–£8,200 installed (with 0% VAT) and saves about £550–£850 a year through self-consumption plus Smart Export Guarantee (SEG) income. Adding a battery and a strong export tariff shortens payback further.
What "payback period" actually means
Your solar payback period is the number of years it takes for the savings to equal the upfront installation cost. After that point, the system is effectively generating free electricity for the rest of its 25-year-plus lifespan. Three levers drive the maths in the UK in 2026:
- Self-consumption savings — every kWh you use from your own roof is a kWh you don't buy from the grid. This is the single biggest saving, because import prices are far higher than export rates.
- SEG export income — surplus electricity you don't use is exported and paid for under the Ofgem Smart Export Guarantee. You can compare the strongest deals in our guide to SEG rates.
- 0% VAT — domestic solar PV and battery storage carry 0% VAT until 31 March 2027, reverting to 5% on 1 April 2027 (HMRC VAT Notice 708/6). Many sites wrongly quote 31 January 2027 — the correct deadline is 31 March 2027.
Solar panel payback by system size (UK 2026)
The table below shows indicative figures for a typical East Yorkshire home generating around 3,400–3,650 kWh per year from a 4kW system, scaled by array size. SEG income assumes a flat export tariff in the region of the strongest 2026 deals. Figures are indicative and depend on your roof, usage pattern and chosen export tariff.
| System size | Typical installed cost (0% VAT) | Annual self-consumption saving | Annual SEG income | Estimated payback |
|---|---|---|---|---|
| 3kW | £5,000–£6,500 | £420–£560 | £70–£130 | ~9–11 years |
| 4kW | £6,200–£8,200 | £500–£700 | £90–£170 | ~8–11 years |
| 6kW | £8,500–£11,000 | £620–£860 | £150–£280 | ~8–10 years |
| 10kW | £12,500–£16,500 | £820–£1,150 | £280–£480 | ~7–10 years |
Indicative — verified June 2026. Costs vary by roof complexity, panel choice and region; check a written quote for your property. A solar savings calculator will personalise these numbers to your roof and usage.
The method: how the numbers are built
Payback is not one figure — it's the sum of three income streams against one cost. Here's how each table row is constructed:
1. Self-consumption (the biggest saving)
A typical 4kW system covers 60–75% of a home's electricity. Because you avoid buying that power at retail import rates, self-consumption is worth several times more per kWh than exporting. Homes that use power during the day — heat pumps, EV charging, working from home — self-consume more and pay back faster.
2. SEG export income
Surplus power is paid for under the Smart Export Guarantee. Ofgem requires suppliers with 150,000+ customers to offer an export tariff, and 2026 rates range from around 1p to 27p/kWh. The strongest flat deal is Octopus Outgoing Fixed at around 15p/kWh, while time-of-use tariffs such as Intelligent Octopus Flux and Outgoing Agile can pay up to ~27p at peak. You'll need an MCS certificate and a smart meter with half-hourly readings to qualify.
3. 0% VAT
Until 31 March 2027, supply-and-install of domestic solar PV and battery storage is zero-rated for VAT (HMRC VAT Notice 708/6). Since 1 February 2024 this also covers standalone batteries. From 1 April 2027 the rate returns to 5%, so installing before that deadline removes a cost from the equation entirely.
SEG tariffs that move the payback needle
| Supplier / tariff | Type | Indicative rate |
|---|---|---|
| Octopus Outgoing Fixed | Flat | ~15p/kWh |
| Intelligent Octopus Flux | Time-of-use | up to ~27p peak |
| Outgoing Agile | Half-hourly | up to ~27p peak |
| EDF / OVO / E.ON Next | Flat / variable | ~3p–15p |
| British Gas / Scottish Power | Flat / variable | ~3p–15p |
| So Energy / Good Energy | Flat / variable | ~3p–15p |
Indicative — verified June 2026; check the supplier for current terms before switching.
How a battery changes your payback
A battery stores daytime solar (or cheap off-peak grid electricity) for use in the evening, lifting your self-consumption from around 60–75% towards 85–90% on a well-sized system. That means fewer expensive import units and more value kept on-site. With a time-of-use SEG tariff, you can also charge cheaply overnight and export at peak — turning the battery into a small income source as well as a saving.
Installed battery storage typically costs around £700–£950 per usable kWh. Two systems we fit:
- Sigenergy SigenStor — an all-in-one unit combining inverter, modular battery (5–48kWh) and an optional DC EV charger, with a ~15-year warranty and true whole-home backup during a power cut.
- Solax Triple Power — an AC/hybrid battery that pairs within the Solax inverter ecosystem, with a ~10-year warranty and strong value for cost-focused homes.
A battery adds upfront cost, so it can lengthen the simple payback by a year or two — but it materially increases lifetime savings and resilience, and on a good time-of-use tariff it often pays back faster than the headline cost suggests. Run the trade-off for your own usage with our solar savings calculator.
What makes payback faster or slower
- Faster: south-facing unshaded roof, high daytime usage, a heat pump or EV, a battery on a time-of-use tariff, and installing before the 0% VAT deadline.
- Slower: east/west or shaded roofs, low daytime occupancy, a weak flat export tariff, and oversizing the array beyond what you can self-consume.
Get a precise payback figure for your home
The ranges above are a starting point — your real payback depends on your roof orientation, household usage and the SEG tariff you choose. YEERS is a Hull-based, MCS-certified solar, battery, heat-pump and EV installer serving Hull, East Yorkshire, North Yorkshire and Lincolnshire, with a 10-year workmanship warranty. Use our solar savings calculator or request a free written quote, and we'll model your exact payback period before you commit.
Frequently asked questions
What is the average solar panel payback period in the UK in 2026?
For a typical UK home, solar pays back in roughly 7 to 11 years. A 4kW system costs around £6,200–£8,200 installed (0% VAT) and saves about £550–£850 a year through self-consumption plus SEG export income. Payback is faster with a battery, a strong export tariff and high daytime electricity use.
How is the solar payback period calculated?
Payback is the upfront installation cost divided by your annual benefit. The benefit combines self-consumption savings (the grid electricity you avoid buying, the biggest factor), SEG income for exported surplus, and the fact that domestic solar carries 0% VAT until 31 March 2027 (HMRC Notice 708/6), which lowers the cost being recovered.
Does adding a battery make solar pay back faster or slower?
A battery adds upfront cost (typically £700–£950 per usable kWh), so simple payback can lengthen by a year or two. However it raises self-consumption from around 60–75% towards 85–90% and, on a time-of-use SEG tariff, lets you export at peak — increasing lifetime savings and often improving the real return.
How much can I earn from the Smart Export Guarantee in 2026?
SEG rates in 2026 range from about 1p to 27p/kWh. The strongest flat deal is around 15p/kWh (Octopus Outgoing Fixed), while time-of-use tariffs like Intelligent Octopus Flux or Outgoing Agile can pay up to ~27p at peak. You need an MCS certificate and a smart meter with half-hourly readings to qualify.
Is there still 0% VAT on solar panels in 2026?
Yes. Domestic solar PV and battery storage (including standalone batteries since 1 February 2024) are zero-rated for VAT until 31 March 2027 under HMRC VAT Notice 708/6. From 1 April 2027 the rate reverts to 5%. Some sources wrongly state 31 January 2027 — the correct deadline is 31 March 2027.
How much electricity will a 4kW solar system generate in Yorkshire?
A 4kW system in East Yorkshire typically produces about 3,400–3,650 kWh per year, enough to cover roughly 60–75% of a typical home's electricity. Output depends on roof orientation, pitch and shading, and self-consumption rises further if you add a battery or use power during daylight hours.
Last updated June 2026 · YEERS — MCS-certified renewable installers, Hull & Yorkshire.
