The Chancellor, Rachel Reeves, has confirmed the introduction of a new tax on the UK's most expensive homes in the Autumn Budget. The new levy, officially termed the 'High Value Council Tax Surcharge', will apply to residential properties in England worth more than £2 million and is scheduled to come into effect from 1st April 2028.
The move is claimed to be part of a wider effort to ensure that those with the "broadest shoulders" contribute more to the public finances, addressing what the government describes as "imbalances in the property tax system".
What is the High Value Council Tax Surcharge?
The High Value Council Tax Surcharge is a new annual charge on residential properties in England valued at £2 million or more. It will be levied in addition to existing Council Tax bills and will be collected by local authorities on behalf of the central government. Crucially, unlike standard Council Tax, which is often paid by the occupier (such as a tenant), this new surcharge will be levied directly on the property owner. The policy is scheduled to come into effect from 1st April 2028.
How much will the tax cost?
The amount payable depends on the value of the property. The charges will be tiered, starting at £2,500 per year and rising to £7,500 per year for the most expensive homes. According to the official Budget statement, the structure will work as follows:
- Properties worth £2 million or more - A starting charge of £2,500 per year.
- Properties worth more than £5 million - A charge of £7,500 per year.
The government has stated it will consult on the detailed implementation of the surcharge in the new year to determine specific bands and how the charge will work in practice.
Why is the 'Mansion Tax' being introduced?
The government argues that the current Council Tax system, which is based on property valuations from 1991, creates unfair anomalies where owners of multi-million pound homes pay comparatively little tax. The Treasury has highlighted that "the average Band D family home pays more in Council Tax than a £10 million property in Westminster".
By introducing this surcharge, the government aims to raise revenue to support funding for local services. The Office for Budget Responsibility (OBR) forecasts that the measure will raise £435 million by 2030/31.
How will properties be valued?
One of the biggest questions surrounding the policy is how the government will determine which homes fall into the £2 million bracket, given that Council Tax bands are currently based on 1991 values. The Chancellor confirmed that the charge will be based on "updated valuations to identify properties above the threshold". This suggests a targeted revaluation process for high-value properties rather than a full nationwide Council Tax revaluation. It is being reported by the BBC that properties in council tax bands F, G & H will be part of the revaluation.
Who will be affected?
The government estimates that fewer than 1% of properties in England will fall within the scope of the new surcharge. However, critics and industry experts have raised concerns about how this might impact specific groups and the top end of the property market.
- Asset-rich, cash-poor - There are concerns regarding homeowners who have lived in properties for decades that have soared in value, but who may not have the liquid income to pay an additional tax bill.
- The top end of the property market - The OBR has noted that the reform could lead to "price bunching" just below the £2 million and £5 million thresholds as homeowners and buyers seek to avoid the additional tax liability.
What happens next?
While the policy has been announced, it will not be implemented for several years. The start date of April 2028 is intended to give homeowners time to prepare. The government will launch a consultation in early 2026 to iron out the details. This consultation will look at:
- Detailed implementation of the bands.
- Who might need additional support to pay the charge.
- How to deliver the surcharge effectively.
Until such time as the consultation is completed and further details on the implementation of the new levy are announced, the current Council Tax rules remain in place.
MTTM AI (beta) 
