Do I need to declare SEG income?

For residential installations under 50kW: no — SEG income is exempt from income tax. No need to include on self-assessment. HMRC guidance confirms this for domestic microgeneration.

What about commercial solar?

Business solar: different rules. Income from solar is taxable as business income. BUT: Enhanced Capital Allowance lets you deduct 100% of the cost in year one. Net effect: still highly tax-efficient.

Is the 0% VAT permanent?

Currently guaranteed until March 2027. May be extended — but nothing is confirmed beyond that date. If it reverts to 5% or 20%, installation costs increase. Installing now locks in the 0% rate.

What about solar on rental properties?

Rental income from a solar-equipped property is taxable as normal rental income. But the solar installation cost can be claimed as a capital expense. SEG income from a rented property is also taxable.

Solar Income Tax-Free UK

By Home Solar Guide Team|Updated 18 March 2026|money

Independently written | Evidence-based | Sources cited

Solar tax free — Solar savings and SEG income are completely tax-free for UK homeowners.

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Is solar panel income tax-free?

Solar panel income is TAX-FREE for UK residential homeowners: (1) ELECTRICITY SAVINGS — every kWh you generate and use is a tax-free saving. No income tax on avoided electricity costs. Saving £580-£1,100/yr completely tax-free. (2) SEG EXPORT PAYMENTS — income from selling surplus electricity is tax-free for domestic installations under 50kW. No need to declare on your self-assessment. (3) 0% VAT ON INSTALLATION — solar installation has 0% VAT (saving £1,000-£1,600 on a typical system). (4) NO CAPITAL GAINS TAX — the increase in your property value from solar panels is covered by your main residence CGT exemption. (5) COMPARISON — to earn £1,000/yr after tax from investments, you'd need £1,250-£1,500 pre-tax income (at 20-40% tax). Solar delivers £1,000 tax-free. This makes solar's effective ROI even higher than headline figures.

Frequently Asked Questions

Related: Home Heating Systems

Solar panels are most powerful when combined with an efficient heating system. Heat pumps use solar-generated electricity to heat your home at 300-400% efficiency — making them the ideal partner for solar.

heat pump running costs in the UK

Heat pumps use electricity at 300-400% efficiency, making them ideal partners for solar.

heat pump installation process

Heat pump installation typically takes 2-3 days and is best planned alongside solar.

From our sister site Home Heat Pump Guide