Challenge 
Mansion tax guides
By Simon Dredzen, active in the prime central London property market for over two decades · Reviewed 8 November 2026
Plain-English guides to the High Value Council Tax Surcharge, the mansion tax, for owners of homes in England worth around £2m or more.
The basics
- How much is the mansion tax? The four bands, the yearly charges, and what dropping one band saves to 2033.
- Who pays the mansion tax? Owners, leaseholders, companies, trusts and joint owners, plus exemptions and deferral.
- Mansion tax and leasehold flats How lease length, floor level and service charges affect a flat's value.
Preparing and appealing
- How to record your home's 2026 condition A checklist of the evidence to gather while it still reflects the valuation year.
- Mansion tax appeal: how to challenge or appeal your band Key dates, the challenge and tribunal stages, and the evidence that counts.
Area research
- Mansion tax in Chelsea Recent sales by band, and how many £2m+ homes sit just above a threshold.
- Mansion tax in Kensington The same research for W8, SW7 and SW5.
- Prime London prices and the London price index: how prices per sq ft have moved since 2024.
Sources: the HM Treasury consultation on the High Value Council Tax Surcharge (closed 14 July 2026), the government's publications on the surcharge, including its response of 28 October 2026, House of Commons Library briefing CBP-10934, and the Finance Bill (Part 3). The Bill sets the bands and who pays; the response confirmed the deferral criteria and exemptions. The valuation date, challenge process, interest rates and other details will follow in the Finance Bill 2026, regulations and guidance, and may change before April 2028. This is general information, not tax, legal or valuation advice.