Electricity VAT Cut October 2026: What UK Home Battery Owners Actually Get

What Andy Burnham announced

On 21 July 2026, in his first cabinet meeting as prime minister, Andy Burnham announced that domestic electricity in the UK would be zero-rated for VAT for six months, from 1 October 2026 to 31 March 2027. It was billed as the first move of a "cost-of-living government" and the funding is being drawn from cancelling the previous administration's £1.8 billion Digital ID programme. The Treasury estimates the cost to the Exchequer at around £850 million in 2026-27.

The measure covers domestic electricity supply in England, Scotland and Wales. Northern Ireland is excluded from the direct VAT relief but the Treasury has confirmed comparable funding will pass to the Northern Ireland Executive to deliver an equivalent household benefit. Small businesses that qualify for the domestic energy VAT rate, charities and residential care homes are all covered. Gas is not included. Domestic gas VAT stays at 5%.

Why the cut is 4.8%, not 5%

The most common misreading of the announcement is that bills fall by "5%". They do not, because 5% VAT is added on top of a net price. To back it out cleanly:

The 4.76% figure is the pass-through you should expect if your supplier does the arithmetic correctly. Some suppliers with older billing systems may quote "5% off electricity" as shorthand; the effect is close enough that it does not matter to the household.

What the average household actually gets

The government's £45 a year figure is calculated against the current 2,700 kWh Ofgem "typical" annual electricity consumption. For six months of relief, that is about £22.50 in real cash. In practice:

• Low-usage household (~1,500 kWh/year, dual fuel): saves around £13 over the six months.
• Typical household (~2,700 kWh/year): saves around £22-24 over the six months.
• All-electric household or heat pump home (~5,000 kWh/year): saves around £45-50 over the six months.
• EV plus heat pump plus battery (~8,000-10,000 kWh/year): saves around £70-95 over the six months.

These are gross savings before any offsetting price cap change. See the government's announcement for the underlying assumptions.

The Martin Lewis warning: variable rate customers may see nothing

Cornwall Insight's October 2026 price cap forecast, updated after the VAT announcement, is £1,699.59 for a typical household, down from its earlier £1,906.27 estimate before the VAT cut was factored in. But the underlying wholesale forecast still pushes the October cap higher than the July 2026 cap on a like-for-like basis.

Martin Lewis has been direct about the arithmetic: while the VAT cut takes 4.8% off bills, the October cap is forecast to rise by around 5.1% before the VAT change is applied. Net-net, most variable-rate households on the Ofgem cap end up roughly where they started.

What it means for a home battery on Octopus Go

Home batteries earn their money on the spread between the rate you charge at and the rate you avoid at peak. Both fall by 4.8% from 1 October, so the spread compresses by the same 4.8%. In the table below, the overnight charging price is the July 2026 Octopus Go rate; the peak price avoided is the Ofgem July 2026 price cap unit rate, used here as the standard-rate benchmark a battery owner displaces at peak:

The reduction in headline arbitrage saving lands around £40 to £45 a year, which is broadly the same as the £45 the average household gets back at the meter. Because battery households import most of their electricity at 9.05p overnight and self-consume it later, the VAT saving on that overnight import is small in absolute terms. But so is the compression of the peak rate they are avoiding. On balance, battery owners see a slightly smaller annual saving but a slightly cheaper battery-charging cost, and the payback period barely moves.

See how much a home battery can save for the underlying numbers by tariff and region and the savings calculator if you want to try your own postcode.

Two VAT relief windows now expire on the same day

The most useful thing about the announcement, if you were already thinking about a battery, is the alignment of two cliff edges. Both the new electricity VAT relief and the existing 0% VAT rate on installed home batteries expire on 31 March 2027.

The battery relief has been running since February 2024, when the Treasury extended the 0% VAT rate to standalone batteries. Full detail on how that relief works, and when the 20% VAT trap catches DIY buyers, is in our VAT on home batteries UK explainer.

The overlap for a UK homeowner considering a battery in autumn 2026 is:

1. Reserve and install before 31 March 2027 → keep the ~£230 of 0% VAT relief on the battery and get 4.8% off your electricity from 1 October through 31 March.
2. Wait to April 2027 → pay 5% VAT on the battery (about £230 more on a £4,599 install) and 5% VAT is back on electricity too.

If a Warm Homes Loan Scheme loan is part of the plan, the sequencing is: apply through a Phase 1 lender from September 2026, get the install completed before 31 March 2027, and you stack the low-rate loan, the 0% battery VAT and the 0% electricity VAT on the same job.

What it does not change

• Standing charges. These are already subject to 5% VAT so they fall proportionally with the unit rate. See the standing charge explainer for how the Ofgem April 2026 pilot separately affects fixed daily charges.
• Domestic gas VAT. Stays at 5%. Households that heat with gas boilers get no benefit on the gas portion of the bill. This makes the case for Cosy Octopus and a heat pump incrementally stronger.
• Wholesale prices. The Ofgem cap continues to move with wholesale gas, network costs and policy costs. The VAT cut sits on top of, not instead of, those movements.
• Battery arbitrage economics. The ratio between overnight and peak rates is unchanged, so all the standard playbooks (force-charge overnight, discharge into peak, capture Free Electricity Sessions, stack DFS payments) still work exactly as before.

Practical checklist for battery owners and buyers

1. Check your supplier confirms the pass-through in writing. Suppliers are expected to update unit rates automatically from 1 October, but ask for confirmation in your app or bill so you can spot any suppliers being slow to move.
2. If you are on a fixed tariff, verify the reduction shows on your October bill. Fixed contracts must still pass the 4.8% saving through. If your unit rate does not fall, complain in writing.
3. If you are on the price cap, do not assume it means a bill cut. The October cap arithmetic already blends in the VAT change alongside a wholesale-driven rise. Your actual position depends on your consumption pattern.
4. If you are shopping for a battery, target install commissioning before 31 March 2027. The clock on the 0% battery VAT starts on the deposit and ends on the day the installer commissions the system. Habo Energy standard lead time is around 4-6 weeks, so a January 2027 deposit is comfortable.
5. Keep the £45 figure in perspective. A home battery on Octopus Go saves around £800-£950 a year. The VAT cut is a marginal adjustment on top of that, not a reason on its own to change your plan.

Bottom line

The 21 July 2026 announcement is a small, temporary tax cut on domestic electricity: 4.8% off unit rates and standing charges for six months, worth around £22.50 in cash to a typical household. Fixed-tariff customers keep the full saving. Variable-rate customers on the Ofgem cap may see it swallowed by the October wholesale-driven cap increase.

For home battery owners, the direct arithmetic is neutral to slightly negative: annual arbitrage savings drop by around £40-£45 as both sides of the spread compress. The more useful headline is timing. Both this VAT relief and the 0% VAT rate on installed home batteries end on 31 March 2027. That gives a six-month window where a UK homeowner can buy a battery at 0% VAT, run it on electricity at 0% VAT, and finance it through the newly-live Warm Homes Loan Scheme at 0-3%. That combination will not exist from April 2027.