How VAT Relief Shaped the UK Solar Market

VAT relief shaped the UK solar market by removing tax from the price of installation, which worked like a subsidy and lowered costs for households just as rising energy bills were pushing demand for rooftop panels to record levels.

What Changed When VAT on Solar Panels Fell to Zero?

Before April 2022, solar panels could qualify for the reduced VAT rate of 5%, but from October 2019, that relief applied only where certain eligibility conditions were met. Other installations paid the standard rate. The government said the European Court of Justice rulings had required it to restrict the relief and that leaving the EU removed that constraint.

In the Spring Statement of March 2022, the Chancellor announced a zero rate. HMRC guidance confirms that solar panels have been zero-rated in Great Britain from 1 April 2022 and in Northern Ireland from 1 May 2023. Battery storage was added from 1 February 2024. The zero rate is due to end on 31 March 2027, when the reduced rate returns (correct as of November 2026).

For households comparing how much solar panels cost before and after the deadline, the return of VAT will raise the upfront price and lengthen the time it takes for bill savings to repay the investment.

Why Would the Government Cut Tax on Solar?

Rooftop solar creates benefits for people other than the household that installs it. Electricity generated on a roof reduces demand on the grid and displaces power from fossil fuels, cutting carbon emissions that affect everyone. These are positive externalities.

Households decide whether to install panels by weighing their private benefits, mainly lower bills, against the cost. They do not count the wider benefits to society, so in a free market fewer panels are installed than would be socially ideal. Economists describe this as under-consumption, where marginal social benefit exceeds marginal private benefit. Government intervention aims to close that gap by making the private decision reflect more of the social benefit.

How Does Zero VAT Work Like a Subsidy?

VAT is an indirect tax, collected by the seller but paid through the price. Removing it has a similar effect to a subsidy: it lowers the price consumers face and encourages more of the good to be bought, moving consumption closer to the socially optimal level. On a supply and demand diagram, the supply curve shifts down by the amount of tax removed, giving a lower price and a higher quantity.

The size of the saving depends on the rate being removed. As an illustration, on a system priced at £7,000 before tax, VAT at 5% would add £350, while the standard rate of 20% would add £1,400.

At the time of the announcement, the Treasury estimated that a typical family installing rooftop solar would save more than £1,000 on installation, alongside an expected £300 a year off energy bills from the panels themselves.

Did Households or Installers Gain Most?

A tax cut does not always reach consumers in full. The theory of tax incidence shows that the split between buyers and sellers depends on how responsive supply and demand are to price.

If installers could expand quickly, competition would push most of the saving through to customers. If there is a shortage of trained installers, supply becomes less responsive to rising demand. This allows installers to maintain higher prices and retain a larger share of the tax saving. In practice, the outcome varies by region and installer, which is why quotes for similar systems can differ widely.

How Much Did Installations Rise?

Demand rose sharply after the relief began. The Microgeneration Certification Scheme (MCS), which certifies small-scale installations, recorded 138,000 solar installations in 2022 and more than 183,000 in 2023, based on its year-end report before the final figures were in. In 2025, it recorded 267,032 certified rooftop installations, beating the previous record from 2011 by 31%. Battery installations exceeded 40,000 in the same year.

Separating the effect of VAT relief from other causes is difficult. Due to rising electricity prices in 2022, many households were able to save more by generating their own power. The reduction in taxes dropped the cost of residential generation, while the increase in residential electricity prices raised the benefit of doing so.

What Happens When the Relief Ends?

A time-limited tax break also affects when people buy. As the March 2027 deadline approaches, some households are likely to bring forward installations to avoid paying VAT, creating a rush of demand followed by a possible slowdown.

The wider policy question is whether the relief should continue. Supporters argue the externalities remain, while critics point to the lost tax revenue and question how much of the saving reached consumers. The answer depends on how effectively the zero rate has encouraged additional installations, rather than simply rewarding households that would have installed panels anyway.