Quick answer: For the vast majority of UK homeowners, Smart Export Guarantee (SEG) payments are not taxable. Income from exporting surplus electricity from a domestic solar PV system is generally treated as outside the scope of income tax, provided your generation is mainly for your own home and not run as a business or trade.
If you have just had solar panels fitted, or you are weighing up a battery to bank more export income, one of the most common questions is whether HMRC will take a slice of your SEG payments. The short version is reassuring for most households, but there are genuine edge cases worth understanding so you can be confident you are on the right side of the rules.
Why SEG income is usually tax-free for homeowners
The Smart Export Guarantee is the scheme, overseen by Ofgem, that requires larger licensed electricity suppliers (those with 150,000+ domestic customers) to pay you for surplus renewable electricity you export to the grid. When you fit solar panels on your own roof and use the electricity primarily to power your home, you are not running a business. You are a domestic consumer who happens to send unused units back to the grid.
HMRC's long-standing approach to micro-generation by households is that this is not a trade. The income is incidental to living in your home, generated from equipment installed for your own domestic use, and so it does not create a tax liability for typical installs. This principle has applied consistently to domestic feed-in and export income, and it continues under SEG. In practice, the payments simply arrive as a credit or transfer from your supplier with no tax to declare.
It is worth being precise: this is the general position for a standard residential installation where the system is sized for your home and the primary purpose is self-supply. Most YEERS customers across Hull, East Yorkshire, North Yorkshire and Lincolnshire fall squarely into this category.
When SEG payments could become taxable
There are limited situations where export income may stop looking like incidental domestic income and start looking like a trade or commercial activity. In those cases, tax could apply. The key triggers to be aware of:
- Generation is run as a business. If you install panels specifically to generate income for profit, rather than mainly to power your own home, HMRC may view it as a trade.
- The property is commercial or mixed-use. Panels on a business premises, a let property, a farm building or a commercial unit are treated differently from a family home, and the income can be taxable.
- The system is oversized relative to the home's needs. A very large array installed mainly to export, rather than to cover household consumption, can shift the picture.
- You are a landlord exporting from a rental. Income connected to a property business may need to be reported.
If any of these apply to you, the income is not automatically taxed, but it does fall into territory where you should check your position rather than assume. For unusual or commercial setups, confirm the treatment with HMRC or a qualified accountant before assuming the payments are tax-free.
SEG, the tax position and your numbers at a glance
The table below summarises the typical scenarios. Treat it as a guide to the general position, not formal tax advice.
| Scenario | Likely tax treatment | What to do |
|---|---|---|
| Standard home solar, sized for your own use | Generally not taxable | Nothing to declare; keep your statements |
| Home + battery, exporting surplus on a peak SEG tariff | Generally not taxable | Same as above; the battery does not change the principle |
| Generation run for profit / as a business | Potentially taxable as trading income | Check with HMRC or an accountant |
| Panels on a let or commercial property | Potentially taxable | Report via the relevant property/business income rules |
Source: general HMRC position on domestic micro-generation; SEG scheme administered under Ofgem. Always verify your individual circumstances at gov.uk.
How much SEG income are we actually talking about?
Understanding the scale of SEG income helps put the tax question in context. The amount you earn depends on your export tariff and how much surplus you send to the grid. Rates currently range from around 1p to 27p per kWh depending on supplier and tariff. The table below shows indicative 2026 figures.
| SEG tariff (indicative) | Approx. rate (p/kWh) | Type |
|---|---|---|
| Octopus Outgoing Fixed | ~15p flat | Fixed |
| Intelligent Octopus Flux / Outgoing Agile | up to ~27p at peak | Variable / time-of-use |
| EDF, OVO, E.ON Next, British Gas, Scottish Power, So Energy, Good Energy | ~3p–15p | Varies by supplier |
Rates indicative — verified June 2026; always check with the supplier as tariffs change. To get the most from your export, compare the strongest deals in our guide to Smart Export Guarantee rates. To qualify for SEG you need an MCS-certified installation and a smart meter capable of half-hourly readings.
A worked example for a typical Yorkshire home
A standard 4kW system in Yorkshire generates roughly 3,400–3,650 kWh a year and covers around 60–75% of a home's electricity. If you export, say, 1,200 kWh of surplus over a year on a 15p flat tariff, that is around £180 of SEG income. For a standard domestic install, that £180 is generally not taxable — it simply offsets your wider energy costs and improves your payback, which typically lands at around 7–11 years (faster with a battery and a strong export tariff).
Adding a battery (typical installed cost around £700–£950 per usable kWh) lets you store cheap or self-generated power and export more strategically at peak rates. That can increase your SEG income, but for a home it does not change the underlying tax position.
Other money matters worth knowing
- 0% VAT. Domestic solar PV, battery storage (including standalone batteries since 1 February 2024) and heat pumps benefit from 0% VAT on supply-and-install until 31 March 2027, when the rate reverts to 5% (HMRC VAT Notice 708/6). Note many sources wrongly quote 31 January — the correct date is 31 March 2027.
- SEG income is separate from grants. Schemes like the Boiler Upgrade Scheme (£7,500 for heat pumps) or ECO4 are not export income and follow their own rules.
- Keep your statements. Even when income is tax-free, retaining your supplier's SEG statements is good practice if your circumstances are ever queried.
The YEERS view
For almost every home we fit across Hull and the wider region, SEG payments are tax-free income that quietly improves your return on solar. As an MCS-certified installer, YEERS makes sure your system is eligible for SEG from day one and sized correctly for your home — which is also exactly what keeps you on the simple, non-taxable side of the rules. If your situation is commercial, mixed-use or unusual in any way, check with HMRC or an accountant first. Ready to find out what solar and battery could return for your home? Compare the best Smart Export Guarantee rates or request a quote and we'll model the numbers for your roof.
This article is general information, not tax advice. For your specific circumstances, consult HMRC (gov.uk) or a qualified accountant.
Frequently asked questions
Do I have to declare SEG payments on a tax return?
For a standard domestic solar installation sized mainly to power your own home, no. HMRC generally treats Smart Export Guarantee income as incidental, non-taxable income, so there is nothing to declare. You only need to consider reporting if the generation is run as a business, or the panels are on a commercial, let or mixed-use property. If you are unsure, check with HMRC at gov.uk.
Is SEG income taxable if I have a battery storage system?
No, not for a typical home. Adding a battery lets you store and export power more strategically, which can increase your SEG earnings, but it does not change the underlying tax position. For a standard residential install, the export income remains generally tax-free whether or not you have a battery, provided the system is for your own domestic use.
When could SEG payments actually be taxable?
Export income may become taxable when it stops being incidental domestic income and starts looking like a trade or commercial activity. The main triggers are: generation run for profit as a business, panels on a commercial or let property, a system oversized mainly to export rather than power your home, or income tied to a property business. In those cases, confirm the treatment with HMRC or an accountant.
Does SEG income affect my benefits or other allowances?
SEG income from a standard home installation is modest and generally treated as incidental, so for most households it has no practical impact on tax allowances. Because individual circumstances vary, particularly where benefits or unusual income are involved, it is sensible to confirm your specific position with HMRC or a qualified adviser rather than assume.
What do I need to qualify for SEG payments in the first place?
To receive SEG payments you need a solar PV system installed by an MCS-certified installer, plus a smart meter capable of providing half-hourly export readings. You then choose an export tariff from a supplier that offers SEG; larger suppliers with 150,000 or more domestic customers are required to offer one. Rates currently range from around 1p to 27p per kWh depending on the tariff.
Last updated June 2026 · YEERS — MCS-certified renewable installers, Hull & Yorkshire.
