Do You Pay Tax on SEG Income?
Do You Pay Tax on SEG Income? UK Rules for 2026
SEG payments land in your bank account with no tax taken off and no letter from HMRC, so it is fair to wonder whether you owe anything. For most households, tax on SEG income is zero. The reason matters, though: the rule that protects you has conditions, and a few situations fall outside it.
The short version
For most UK homeowners, Smart Export Guarantee payments are exempt from Income Tax under HMRC’s domestic microgeneration rule. The conditions: the panels are on or near a home you live in, and you do not intend them to generate significantly more electricity than that home uses. HMRC’s guide is that up to about 20% above your own use is fine. If that describes you, there is nothing to declare. Landlords, businesses, farms and oversized systems sit outside the rule, but the £1,000 trading and miscellaneous income allowance usually covers the small sums involved. Self Assessment only becomes necessary when taxable export income, plus any other casual income, passes £1,000.
Is SEG income taxable? The quick answer
Usually not. HMRC’s rules work like a short checklist, and most homeowners get a clear result at the first question.
- Are the panels on or near a home you live in, and sized for your own use? If so, your export income is exempt from Income Tax. There is nothing to declare and nothing to pay.
- If not, is all your casual income £1,000 or less in the tax year? Export income that is not exempt, plus any side income, is covered by the £1,000 allowance. You owe nothing.
- Over £1,000 and no exemption? Register for Self Assessment by 5 October after the tax year ends, file by 31 January, and pay tax on the excess.
The HMRC rule that makes most SEG income tax-free
The rule sits in section 782A of the Income Tax (Trading and Other Income) Act 2005, and HMRC explains how it applies in its Business Income Manual (BIM40520). Income an individual earns from selling electricity generated by a microgeneration system is exempt from Income Tax when both of these are true:
- The system is installed at or near domestic premises you occupy. “Domestic premises” means a property used wholly or mainly as a separate private dwelling. A roof, a garage roof or a ground mount in the garden all count.
- You intend the amount of electricity it generates not to significantly exceed the amount used in those premises.
“Microgeneration” in HMRC’s manual means generating capacity of up to 50kW, so ordinary home systems are well inside the limit. The same page says the exemption can also cover a second property, provided you use it as a separate private dwelling and meet the other conditions.
What “significantly exceed” means in practice
HMRC does not define the phrase in law. Its manual says that, in general, a householder who does not intend to generate more than 20% above their own domestic needs is unlikely to be treated as intending to significantly exceed them. So treat 120% of your annual household electricity use as the working ceiling. Here is how that looks, using about 1,000 kWh of generation per kWp a year:
| Household use | System | Annual generation | Generation vs use | Where that sits |
|---|---|---|---|---|
| 4,000 kWh | 4kWp | ~4,000 kWh | 100% | Inside HMRC’s guide |
| 3,500 kWh | 4kWp | ~4,000 kWh | 114% | Inside HMRC’s guide |
| 3,000 kWh | 5kWp | ~5,000 kWh | 167% | Above the guide |
| 2,500 kWh | 8kWp | ~8,000 kWh | 320% | Exemption unlikely to hold |
It is about intention, so a low-use home with a good-sized system is not automatically offside
The test is what you intended when you bought the system, judged on the circumstances. A system sized with an EV or heat pump in mind is easier to defend if you can show the plan. That is our reading of how the test works in practice, not wording from HMRC.
Many ordinary homes will sit above 120% on paper, especially with 4kWp or more on a low-use household. That is where the £1,000 allowance below matters: even if the exemption were challenged, a few hundred pounds of export income is still covered.
Do you still need to declare it?
Where the exemption applies, HMRC’s manual says no Income Tax arises, so there is nothing to put on a return. Some websites say every SEG payment must be declared regardless. HMRC’s guidance does not say that for exempt domestic microgeneration. If you already file Self Assessment for other reasons, exempt SEG income does not need an entry. If you are unsure about your own return, ask HMRC or an accountant.
One consequence is easy to miss. Exempt SEG income is not chargeable income, so it should not count towards your £1,000 allowance. Press stories that add every homeowner’s SEG payments to their side income assume the exemption does not apply.
When SEG income can be taxable
The exemption is for individuals generating power for their own home. It stops helping in the situations below.
| Situation | Exemption? | What usually happens |
|---|---|---|
| Your own home, system sized for your use | Yes | No tax, nothing to declare |
| Second home you use as a separate private dwelling | Can apply | Same test; keep your evidence |
| System generating well over 120% of household use | Unlikely | Export income is taxable; the £1,000 allowance may cover it |
| Panels on a property you let to tenants | No | You do not occupy it, so the income is taxable (see landlords below) |
| Business premises, farm buildings, commercial roofs | No | Taxed as business income |
| Rent-a-roof or operator-owned panels | Not relevant | You receive no SEG; the operator does |
| Battery trading, V2G, flexibility payments | Unclear | See the battery section below |
Who actually ends up with a tax question?
- Large arrays on low-use homes, such as a 15kWp ground mount at a household that uses 3,000 kWh a year.
- Landlords and businesses, where the owner does not live at the property or the panels serve a trade.
- People mixing non-exempt export income with side income, such as online sales or freelance work, all sharing one £1,000 allowance.
The £1,000 trading allowance as a safety net
When the exemption does not apply, HMRC’s trading and miscellaneous income allowance usually does the work. HMRC’s manual says an export tariff received outside a business is generally taxed as miscellaneous income, and the allowance covers both trading and miscellaneous income. The GOV.UK allowances guidance has the details. The main points:
- £1,000 or less, gross: fully relieved. You normally do not need to tell HMRC, but you must keep records of the income.
- Over £1,000: you pick one route. Either deduct the £1,000 allowance from your income, or deduct your actual allowable expenses. You cannot use both.
- One pot per person: the £1,000 is shared across all your trading and miscellaneous income. Property income has its own separate £1,000 allowance.
- Gross, not profit: the limit applies to what you receive before costs.
- Not available for trading income from a partnership, or income from a company you control or an employer.
The 5 October date matters
If your gross income that is not exempt goes over £1,000 in a tax year, you must register for Self Assessment by 5 October after that tax year ends. The tax year runs from 6 April to 5 April.
SEG income by system size, and when tax would apply
Fixed SEG rates in 2026 run from about 3p to 25p per kWh, with time-of-use tariffs reaching around 32p at peak for battery owners. Our best SEG tariff rates comparison ranks them, and the SEG income estimator works out your own figure. The table uses the same assumptions as the rest of SolarBriton: about 1,000 kWh generated per kWp, half of it exported, and no battery. The 7p column is the average rate we use in our cost calculations. The 15p column is a strong fixed tariff.
| System | Generation | Exported (50%) | SEG at 7p | SEG at 15p | Tax at 15p, no exemption |
|---|---|---|---|---|---|
| 3kWp | 3,000 kWh | 1,500 kWh | £105 | £225 | £0 |
| 4kWp | 4,000 kWh | 2,000 kWh | £140 | £300 | £0 |
| 6kWp | 6,000 kWh | 3,000 kWh | £210 | £450 | £0 |
| 10kWp | 10,000 kWh | 5,000 kWh | £350 | £750 | £0 |
| 20kWp (barn or smallholding) | 20,000 kWh | 10,000 kWh | £700 | £1,500 | ~£100 |
Annual SEG income against the £1,000 allowance
Only the 20kWp system at 15p clears the allowance. Most of these systems would also sit inside the domestic exemption, so treat the tax column as a worst case.
What a bill looks like when the allowance runs out
Take the 20kWp system at 15p, earning £1,500 gross where the exemption does not apply. Deduct the £1,000 allowance and £500 is taxable. At the 20% basic rate that is £100; at the 40% higher rate it is £200. These are the England, Wales and Northern Ireland rates. Scotland sets its own income tax bands, so the figure will differ there.
If your allowable costs, such as maintenance, insurance, metering and accountancy fees, come to more than £1,000, deducting actual expenses instead gives a lower bill. The cost of the panels themselves is capital spending, relieved through capital allowances where the income is business income. That is covered in the business section below.
Landlords, rent-a-roof and free solar contracts
These are three different situations with three different answers.
You let the property and own the panels
The domestic exemption needs the property to be one you occupy. Tenants live in a let property, so the exemption is not available to the landlord. The export income is taxable, and the £1,000 allowance may cover small amounts. How it is reported, as its own income or alongside your rental profits, depends on how you hold and use the panels, so check with an accountant before assuming either way. Our guide to solar panels for landlords covers the EPC rules and the wider economics.
You have a rent-a-roof or operator-owned system
You receive no SEG income at all, because the operator owns the panels and collects the export payments. For an owner-occupier, free or discounted electricity is not taxable income. The bigger issue with these contracts is usually the lease terms when you sell or remortgage. Our rent-a-roof buyout guide explains what it costs to own the panels outright.
You live in the home and own the panels
This is the standard case covered by the exemption above. Holiday lets and short-term rentals are different again, so see our guide to solar panels for holiday lets and Airbnb before assuming the same result.
Businesses, farms and community projects
For a sole trader, partnership or company, SEG income is a business receipt. It is taxed with your other profits, and companies pay corporation tax on it. The domestic exemption is for individuals and their homes, and the £1,000 allowance does not apply to partnership income.
On a farm, HMRC’s manual says a generation tariff received in a business capacity is a business receipt, even where the same premises are partly private. If the farmhouse and the farm buildings share an installation, the business use needs separating, which is worth an accountant’s time.
The installation cost is normally relieved through capital allowances: the Annual Investment Allowance, or full expensing for companies. If a grant helped fund the install, ask your accountant how it affects your claim. Commercial installs also do not get the 0% VAT rate described below. Our guides to commercial solar panels and capital allowances for UK businesses go deeper, and the solar panels for farms section covers agricultural setups.
Feed-in Tariff vs SEG: how the tax differs
The tax treatment is closer than most people expect. HMRC’s manual on feed-in tariffs (BIM40510) says a generation tariff an individual receives outside a business is generally not taxed, and BIM40520 says no Income Tax arises on feed-in tariffs from domestic microgeneration when the exemption conditions are met. Export payments follow the same test as SEG.
That changes the picture for early adopters. If your panels are on your own home and sized for it, a high legacy tariff does not create a tax bill by itself, even where payments run to four figures. If the panels are on a let property or business premises, the answer is different, so check before assuming.
You cannot be paid FIT export tariff and SEG for the same system at once. FIT economics are shifting too: see what happens when your 20-year FIT ends, and why some FIT payments have shrunk.
Battery exports, V2G and flexibility payments
The exemption covers income from selling electricity generated by your microgeneration system. Exports of solar you stored in a battery fit that wording. Three newer income types are less clear:
- Exports of electricity you charged from the grid, such as charging off-peak and selling at peak on a time-of-use tariff.
- Vehicle-to-grid exports from an EV battery.
- Flexibility or demand-response payments for shifting your usage.
We have not found specific HMRC guidance on these. The cautious approach is to treat them as casual income that uses the £1,000 allowance, and to keep the statements. On that reading, a household with £400 of exempt SEG and £700 of flexibility payments counts only the £700 towards the allowance. If these payments grow into the hundreds of pounds a year, ask an accountant. Our guides to Octopus Flux vs Intelligent Octopus Go and V2G income cover how the schemes pay.
VAT on installs and on export payments
Two separate VAT questions get mixed up.
VAT on your installation. Qualifying energy-saving materials, including solar panels and batteries, installed in residential accommodation in Great Britain carry 0% VAT until 31 March 2027. From 1 April 2027 the rate reverts to the 5% reduced rate unless the government extends the relief. Northern Ireland differs, and commercial premises pay the standard 20%. The grant and VAT savings checker and our 2026 solar panel grants guide cover what applies to you.
VAT on your export payments. Selling electricity to a supplier is a taxable supply, but VAT registration is only compulsory once your taxable turnover passes £90,000 in any rolling 12 months. Domestic SEG income of a few hundred pounds is nowhere near that. If you already run a VAT-registered business, your export sales go on your VAT return at the standard rate, and they count towards your taxable turnover.
Self Assessment deadlines and penalties
These dates only matter if you have taxable income to report. Exempt SEG income and amounts fully covered by the allowance do not trigger them.
| What | Rule |
|---|---|
| Tax year | 6 April to 5 April. The 2025/26 year ended on 5 April 2026. |
| Register for Self Assessment | By 5 October after the tax year ends, if gross income that is not exempt went over £1,000. For 2025/26 that date was 5 October 2026. |
| File online and pay | By 31 January after the tax year ends. For 2025/26 that is 31 January 2027. |
| Late filing penalty | An automatic £100 if you were required to file and missed the deadline, even where no tax is owed. |
| Failure to notify | Based on the tax you owe, so where little or no tax is due the penalty is small or nil. |
| Keeping records | At least five years after the 31 January filing deadline. Keep allowance records too. |
Missed the 5 October registration date? Register as soon as you can and tell HMRC. The £100 headlines you may have seen apply only to people who had to file and did not. If your SEG income is exempt or fully covered by the allowance, there is no return to be late with.
Records to keep, even when you owe nothing
If HMRC ever asks about a year, “the exemption applies, and here is the paperwork” ends the conversation quickly. Keep these for as long as you own the system:
- Your installer’s design and estimated annual generation, usually shown on the MCS paperwork, plus the commissioning date.
- Twelve months of electricity bills or smart meter data showing household use, as the baseline for the 120% check.
- A short note of how you sized the system, including any EV or heat pump you planned for.
- Annual export statements and payment summaries from your SEG supplier. If statements look wrong, our guide to smart meters not sending export readings helps.
- Flexibility, V2G and battery trading statements, filed in the same folder.
- Receipts for allowable costs if you use the expenses route: maintenance, insurance, accountancy fees.
FAQs
For most UK homeowners, no. SEG payments for panels on or near your own home are exempt from Income Tax under HMRC’s domestic microgeneration rule (section 782A of ITTOIA 2005), provided you do not intend the system to generate significantly more electricity than your household uses. HMRC’s guide is that up to about 20% above your own use is acceptable. Landlords, businesses and oversized systems fall outside the exemption, although the £1,000 trading and miscellaneous income allowance often covers small amounts.
Not if the domestic exemption applies, because no Income Tax arises and there is nothing to report. If the exemption does not apply, export income of £1,000 or less in a tax year is covered by the allowance and you normally do not need to tell HMRC, though you should keep records. Once your gross income that is not exempt goes over £1,000, you must register for Self Assessment by 5 October after the tax year ends and file by 31 January.
HMRC’s manual says a householder who does not intend to generate more than 20% above their own domestic needs is unlikely to be treated as intending to significantly exceed them. In practice, a system that generates up to roughly 120% of your annual household electricity use sits comfortably inside the exemption. It is guidance rather than a legal limit, and the test is your intention, judged on your circumstances.
Where the domestic exemption does not apply, yes. The trading and miscellaneous income allowance covers up to £1,000 of gross income per tax year, shared across all your trading and miscellaneous income. Over £1,000, you can either deduct the £1,000 allowance or deduct your actual allowable expenses, but not both. It is not available for trading income from a partnership.
Only if you were required to file a Self Assessment return and missed the 31 January deadline. The £100 late filing penalty is automatic, even when no tax is owed. If your SEG income is exempt or fully covered by the £1,000 allowance, there is no return to file for it, so there is nothing to be late with.
Not in practice for homeowners. HMRC’s manual says no Income Tax arises on feed-in tariffs an individual receives from domestic microgeneration when the exemption conditions are met, so high legacy tariffs do not create a tax bill by themselves if the system is on your own home and sized for it. You cannot be paid FIT export tariff and SEG for the same system at once.
In principle yes. The domestic exemption needs the property to be one you occupy, and tenants occupy a let property. Small amounts may be covered by the £1,000 allowance, and larger amounts need to be declared. How the income is reported depends on how you hold and use the panels, so check with an accountant.
Almost certainly not as a household. VAT registration is only compulsory once taxable turnover passes £90,000 in any rolling 12 months, and domestic SEG income is typically a few hundred pounds. Installations carry 0% VAT on qualifying energy-saving materials in Great Britain until 31 March 2027, reverting to the 5% reduced rate on 1 April 2027. If you run a VAT-registered business, export sales join your standard-rated turnover.
What to do this year
- Check the basics. Are the panels on or near a home you live in? If yes, move to step 2. If you let the property or use it for business, go to step 3.
- Compare generation with household use. Your system’s estimated annual output should be no more than about 120% of what your home uses in a year. If it is, the exemption applies and you are done.
- Add up your casual income. Count export income that is not exempt, plus any side income, for the tax year. Under £1,000 means no tax. Over £1,000, or if you are a landlord or business, register by 5 October and talk to an accountant.
- Review your tariff while you are at it. The gap between a 3p and a 15p export rate is worth more than most tax worries. Compare SEG rates side by side before you renew.
Tax should not be the reason you skip solar. For a typical UK home, the SEG tax bill is nil and the paperwork is a folder of statements.
Related SolarBriton guides
Sources and disclaimer
- HMRC Business Income Manual, BIM40520: Income Tax exemption for domestic microgeneration
- HMRC Business Income Manual, BIM40510: renewables obligation and feed-in tariffs
- HMRC Business Income Manual, BIM86000: trading and miscellaneous income allowance
- GOV.UK: tax-free allowances on property and trading income
- GOV.UK: VAT treatment of installing energy-saving materials in Great Britain
- GOV.UK: Smart Export Guarantee guidance
This guide is general information based on HMRC guidance checked in October 2026. It is not tax advice, and individual circumstances differ. For your own situation, check with HMRC or a qualified accountant.
