The new “mansion tax”: what higher-value homeowners need to know

What the surcharge is

The High Value Council Tax Surcharge (HVCTS) was announced in the Autumn Budget on 26 November 2025 and confirmed as a new annual charge on property owners whose homes are valued at £2 million or more in 2026 prices. It is collected alongside existing council tax from April 2028 and is levied on the owner of the property, not the occupier — meaning it applies whether the owner lives there, rents it out, holds it through a trust, or is based overseas.

The charge is structured in four bands based on property value:

• £2m to £2.5m: £2,500 per year
• £2.5m to £3.5m: £3,500 per year
• £3.5m to £5m: £5,000 per year
• Over £5m: £7,500 per year

These figures are on top of existing council tax, which for a Band H property in London already runs to several thousand pounds per year. The combined annual cost for a homeowner in the lowest band is therefore higher than the surcharge figure alone suggests.

Who is affected and where

Based on House of Commons Library analysis, approximately 100,000 homes in England fall above the £2 million threshold. Around 80% of those are in London and the South East, reflecting both the concentration of high-value property in those regions and the extent to which decades of price growth have pushed properties into this bracket without the owners necessarily being wealthy in any liquid sense — particularly in the case of older homeowners whose property value has grown considerably since purchase.

The surcharge applies to the value of the property as assessed, not to the owner’s income. A retired homeowner on a modest pension living in a family home that is now worth £2.2 million faces the same £2,500 annual charge as an owner with a substantially higher income. That asymmetry — an asset-based charge on people who may be income-constrained — is the element that has generated the most discussion among homeowner groups, including the HomeOwners Alliance, which has been vocal in its criticism of the measure.

The threshold uncertainty

There is live speculation, reported in the housing and financial press, that the government may lower the £2 million threshold to £1.5 million in a future Budget. If that change were made, the number of homes affected would increase substantially, and properties that are currently below the threshold by a margin would come into scope. No announcement has been made and the £2 million threshold remains the confirmed position, but the speculation is worth knowing about for homeowners whose property value sits in the range that could be affected by a threshold reduction.

What this means for retirement and estate planning

For older homeowners — many of whom have significant property wealth but relatively modest income — the surcharge introduces a new recurring annual cost that was not part of their financial picture when they planned their retirement. A charge of £2,500 to £7,500 per year, on top of existing property costs and council tax, is not insignificant when income is fixed.

It also changes one element of the estate planning picture: the annual holding cost of a high-value property has increased. For homeowners who are already thinking about how they use or eventually pass on their property wealth, the surcharge is a new factor in that calculation — not a reason to make any particular decision, but a real cost that belongs in the full picture.

Understanding what a property is currently worth, and what options exist for accessing some of that value, becomes more relevant when the ongoing cost of ownership increases. Our guide to equity release and inheritance tax covers how property wealth is treated for estate planning, and our guide to how much you could release explains how equity release amounts are calculated based on current property value and age.