The press called it a mansion tax the moment it was announced at the Autumn Budget 2025. Officially it's the High-Value Council Tax Surcharge, and from April 2028 it adds a fresh annual charge on top of council tax for English homes worth more than £2 million. It won't touch most portfolios, but for anyone building or holding at the top of the North West market — Wilmslow, Alderley Edge, Prestbury, the Wirral's premium waterfront — it changes what a £2 million-plus home actually costs its owner to keep, and that's worth pricing in well before 2028 arrives.
How the surcharge is banded
As announced, the charge rises in steps with the value of the property:
- £2m – £2.5m: £2,500 a year
- £2.5m – £3.5m: £3,500 a year
- £3.5m – £5m: £5,000 a year
- £5m+: £7,500 a year
Every figure sits on top of the ordinary council tax bill the property already attracts — this is an additional charge, not a replacement band. A £2.4 million house in Cheshire keeps paying whatever council tax band it's already in, and then picks up another £2,500 a year alongside it.
A new valuation exercise, not the 1991 bands
Ordinary council tax bands are still pegged to 1991 values, which is useless for identifying which homes are worth over £2 million in today's market. Rather than a full national revaluation, the plan is a targeted valuation exercise aimed at properties near or above the threshold ahead of the 2028 start date, with a route for owners to challenge a figure that looks wrong. If you own or are developing something that could plausibly sit either side of £2 million, that valuation — not your existing council tax band — is the number that will decide whether the surcharge applies at all.
Collected differently to your existing bill
Local billing authorities issue council tax based on 1991 bands and aren't set up to administer a national value-based surcharge, so this charge is expected to be assessed and collected centrally by HMRC rather than folded into the bill your council sends. Practically, that means a separate process to register or confirm a valuation, and a separate payment, running alongside — not instead of — the council tax demand you already get.
England only, for now
Council tax is devolved, and neither Scotland nor Wales has introduced an equivalent charge. A £2.2 million house in Edinburgh or Cardiff isn't affected by this measure, though there's nothing stopping either devolved government legislating its own version later if it wants the revenue. For now, it's specifically a charge on English residential property.
What it means for developers building at the top of the market
If you're pricing new-build units that land at or above £2 million, the eventual owner's annual holding cost is now materially higher than it would have looked two years ago — £2,500 to £7,500 a year, on top of council tax, for as long as they own it. Worth raising with buyers directly rather than letting it surface as a surprise after completion. And if a high-value unit sits unsold and empty past April 2028, whether it counts as a chargeable dwelling for this purpose, and how that interacts with the existing empty property and second homes council tax rules, is still one of the details to watch as the legislation is finalised rather than something settled yet.
If the property in question is held inside a company that already falls within the Annual Tax on Enveloped Dwellings regime, it's also worth checking how the two charges are meant to interact once the detail lands — ATED and this new surcharge are separate charges built on separate thresholds, and there's no confirmation yet that falling inside one gets you any relief from the other.
What this means in practice
If you own, or are developing, anything likely to be valued above £2 million by 2028, start modelling the extra £2,500 to £7,500 a year now rather than waiting for the valuation letter to land. Keep an eye out for the valuation exercise itself and be ready to challenge a figure that looks wrong — it's the valuation, not your instinct about what the house is worth, that fixes the band. And if you're marketing units at this level, build the ongoing cost into the buyer conversation before exchange, not after.
Common questions
What is the High-Value Council Tax Surcharge?
It's a new annual charge on residential properties in England valued above £2 million, announced at the Autumn Budget 2025 and due to start from April 2028. It sits on top of the existing council tax bill rather than replacing it, and is banded so that higher-value homes pay more.
How much will the surcharge cost?
As announced, the surcharge is banded broadly as follows: £2,500 a year for homes worth £2 million to £2.5 million, £3,500 for £2.5 million to £3.5 million, £5,000 for £3.5 million to £5 million, and £7,500 for homes worth more than £5 million. These figures sit on top of the ordinary council tax bill for the property.
Who values the property to decide if it's over £2 million?
Existing council tax bands are based on 1991 values and can't identify which homes are worth over £2 million today, so a separate valuation exercise is being run ahead of the 2028 start date, focused on properties near or above the threshold, with a right for owners to challenge the figure reached.
Does the surcharge apply in Scotland and Wales?
No. Council tax is a devolved matter, and neither Scotland nor Wales has adopted an equivalent surcharge. It applies to residential property in England only, though the devolved governments could in principle introduce their own version later.
Kieran Holsgrove is a Director and Co-Founder of Grafene Accounting, the property tax specialist firm based in Liverpool. He advises property developers, investors and landlords across Merseyside, Greater Manchester, Lancashire and Cheshire on tax structuring, developer VAT, SDLT and the long-view decisions that compound over the life of a portfolio.
This article is general information, not personal tax advice, and tax rules change. Your own position depends on facts we cannot see from here — please take advice before acting on anything above.