Budget 2025: UK “Mansion Tax” Confirmed: What Owners of £2m+ Homes Need to Know
03/12/2025

Chancellor Rachel Reeves has confirmed a new high-value council tax surcharge – widely called the “mansion tax” – targeting residential properties in England worth more than £2 million. The charge starts in April 2028 and is designed to address what the government sees as unfairness in the current council tax system.

How Much Will It Cost?

• Properties valued £2m – £5m: £2,500 extra per year
• Properties valued £5m and above: £7,500 extra per year The surcharge is on top of normal council tax and will rise each year from 2029–30 in line with CPI inflation.

Who Pays?

The charge falls on the property owner, not the tenant. This means landlords of high-value rental properties will be liable, unlike standard council tax which tenants usually pay.

How Many Homes Are Affected?

The government expects fewer than 1% of properties in England to be caught. However, London alone has around 349,000 homes currently worth £2 million or more, so the impact will be heavily concentrated in the capital and parts of the South East.

How Will They Know Which Homes Qualify?

The Valuation Office Agency (VOA) will carry out a major revaluation exercise to identify properties above the £2 million threshold. Values will then be updated every five years. Properties over £2m will be placed into new high-value bands.

Why Is the Government Doing This?

In her Budget speech, Rachel Reeves highlighted the current anomaly:

“A band H home in Darlington pays just over £2,400 – the same as a £10 million mansion in Mayfair.”

The Treasury estimates the surcharge will raise around £430 million a year from 2028–29. Local authorities will collect the money.

Criticism and Regional Concerns

Opponents argue the flat £2m threshold creates unfairness. Michael Shapiro, partner at Spencer West LLP, points out:

“In some parts of the country £2 million buys a substantial country mansion, while in prime central London it might only get you a two- or three-bedroom flat in a mansion block.”

Many affected owners are expected to be older residents who have lived in their homes for decades and seen values soar, rather than the ultra-wealthy the policy is often portrayed as targeting.

What Happens Next?

A formal consultation will be published in early 2025. It will ask:

• How the surcharge should be structured and banded
• What relief or support might be needed (e.g. for asset-rich, cash-poor owners)
• How to make the system fairer across different regions

Key Takeaway

If you own a residential property in England currently worth £2 million or more (or likely to reach that level by the next VOA valuation), budget for an extra £2,500–£7,500 annual bill from April 2028 – and keep an eye on the upcoming consultation for possible changes or reliefs.

More details will emerge in 2025, but the direction of travel is now clear: higher-value homes will pay significantly more council tax.