Can HMRC Really Walk Into Your Home? The Mansion Tax Explained
As of 30 August 2026, the proposed High Value Council Tax Surcharge (HVCTS), often called the mansion tax, is raising a difficult question for owners of valuable homes: can an HMRC valuation agent demand entry? The proposal is not yet operating, but the consultation has put both the new annual charge and the planned valuation process under close scrutiny.
- The proposed surcharge would apply to homes in England valued above £2 million and be collected from April 2028.
- Most valuations are expected to be desk-based, but agents may visit where internal details or re-measurement are needed.
- Refusing entry when it is demanded may lead to a fine of up to £200 and could be a criminal offence.
- Owners near the threshold should keep property records orderly and be ready to challenge an inaccurate valuation.
What is the proposed surcharge?
Announced by then-Chancellor Rachel Reeves at the Budget on 26 November 2025, the HVCTS is a proposed annual charge on homes in England worth over £2 million. As of 30 August 2026, the entry charge is £2,500 a year, with higher bands above £2.5 million, £3.5 million and £5 million, rising to £7,500. It would be collected alongside council tax, but the revenue would go to the Treasury, not local councils.
Why the inspection power is attracting attention
HMRC intends to use valuation agents to decide whether a property crosses the threshold. It says most cases will be handled through desktop valuations using sales data, aerial maps and planning applications. An in-person visit is expected only where attributes can be confirmed internally or a property needs re-measuring.
Agents can demand entry to inspect relevant features, including size, architectural style, bedrooms, bathrooms and storeys. Critics, including the Conservatives, argue this is intrusive. Unique homes can also be difficult to value from a screen, creating scope for appeals.
Who should be watching?
The immediate focus is homeowners and investors at or above £2 million. Around 75,000 homes sit just below that line. The Government is considering responses to the 19 May to 14 July 2026 consultation. A reduction to £1.5 million is speculation, not settled policy.
Ltd company directors should consider their wider position. Our limited company accounts support helps keep company and personal records clear. Individual property income tax rates are due to rise by 2% from April 2027, to 22%, 42% and 47%; this particular change does not affect property held through a Ltd company. Landlords can also explore our property accounts service.
Questions owners are asking
1. Is the mansion tax already being charged?
No. As of 30 August 2026, it is a proposal. Collection is planned from April 2028, subject to the Government completing its policy process.
2. Can an HMRC agent enter my home?
Valuation agents can demand entry where inspection is necessary. HMRC says most valuations will be desktop-based and visits should be limited to cases needing internal confirmation or re-measurement.
3. What happens if I refuse entry?
A refusal after entry is demanded may carry a fine of up to £200 and could be a criminal offence. Seek advice rather than simply refusing or ignoring the request.
4. How much could the surcharge cost?
The proposed starting charge is £2,500 a year for homes over £2 million, with higher bands reaching up to £7,500 a year.
5. Could homes below £2 million be included?
Possibly, but not under the announced threshold. A reduction to £1.5 million has been discussed as speculation and is not confirmed.
6. What if the valuation is inaccurate?
Desktop assessments may struggle with distinctive homes. Keep evidence ready for the appeal process when the final rules are published.
Need a clear view of your property tax position?
Whether you own property personally or through a company, we can help you understand the records and tax issues that matter. Explore our personal tax return support, review our pricing, or speak to us directly.
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