Mansion Tax Explained: The UK's £2m Home Surcharge in 2026

The "mansion tax" is the nickname for the High Value Council Tax Surcharge (HVCTS): an annual charge on English homes valued over £2 million, announced at the November 2025 Budget and due to start in April 2028. It is the biggest change to residential property taxation since council tax began in 1993, and, as of August 2026, it is still a proposal rather than law. This guide covers what the surcharge is, the four rate tiers, who pays it, how homes will be valued, the timeline to the first bills, and what owners near the £2 million line should do now.

What is the mansion tax?

The mansion tax is a proposed annual surcharge on homes in England valued at more than £2 million in 2026 prices, charged on top of the owner's existing council tax bill from April 2028. It is not a new council tax band and it is separate from the 1991-based banding system: your current band does not decide whether you are in scope, only the Valuation Office's estimate of your home's 2026 value does. There is one other structural difference: the OBR's costing note confirms the revenue flows to central government, not to your local council as ordinary council tax does.

How much is the mansion tax? The four rate tiers

The surcharge starts at £2,500 a year and rises through four tiers to £7,500 a year for homes valued over £5 million. The tiers were set out in the government's consultation document and confirmed in the OBR's costing, which also estimated how many homes fall into each one:

Council Tax Challenger's reading of the OBR figures: 71,000 of the 165,000 homes in scope (43%) sit in the lowest tier, so the most common mansion tax bill will be £2,500 a year. Note the asymmetry in the uprating rules: under the proposals the four charge amounts rise with CPI inflation from 2029-30, but the £2 million entry threshold and the tier boundaries are not index-linked. As prices grow, more homes drift into scope at each five-yearly revaluation.

Who pays the mansion tax?

The owner pays, not the occupier. This is the reverse of ordinary council tax, where the resident is normally liable. For leasehold homes, the consultation proposes that the leaseholder is treated as the owner where the lease was originally granted for more than 21 years, which covers almost all owner-occupied flats. Tenants owe nothing directly. The OBR estimates around 165,000 English properties will be in scope in 2028-29 before behavioural effects, heavily concentrated in London and the South East, and it rates the size of that tax base as highly uncertain. Scotland, Wales, and Northern Ireland are entirely outside the scheme.

How will my home be valued for the mansion tax?

The Valuation Office will run a standalone valuation exercise on 2026 values, mostly from a desk. The consultation proposes a model-assisted approach: an automated valuation model (AVM) produces an estimate from sales data and property attributes, with valuers reviewing the output rather than visiting every home. It is not a revaluation of the 1991 bands, and in-person inspections are expected to be the exception. Desk valuations built on models are exactly where errors creep in, which is why the evidence you hold about your own home matters. Our sister guide on how the VOA will value your home for the mansion tax covers the method in depth.

When does the mansion tax start? The timeline to 2028

1. 26 November 2025: the surcharge is announced at the Budget.
2. 19 May to 14 July 2026: the technical consultation runs, launched alongside written statement HCWS35.
3. August 2026 (now): the consultation response is pending and the policy is not yet law. No Finance Bill has been introduced.
4. Late 2027: the Valuation Office is due to publish a draft list of in-scope properties, opening a proposed 8-month challenge window.
5. March 2028: first bills are issued for the 2028-29 year; the charge applies from April 2028.
6. 2033: the first of the proposed five-yearly revaluations.

Can I appeal the mansion tax valuation?

Yes, under the proposed rules. When the draft list is published in late 2027, owners get an initial 8-month window to challenge their valuation, dropping to a 6-month standard window afterwards. The VOA must respond within 4 months, and if you disagree with its decision you have 3 months to appeal to the Valuation Tribunal for England. You must keep paying the surcharge while a challenge runs. The evidence that wins is comparable sales of similar homes dated around 2026, because that is the valuation date. Challenging your council tax band today costs nothing, and nothing in the consultation proposes charging owners to challenge an HVCTS valuation either.

Appeals are not a long shot here. The OBR's own costing assumes, as a provisional modelling assumption, that 20% of charged owners will appeal and that 40% of those appeals will succeed. That is a far higher expected success rate than ordinary band challenges, mainly because the tiers are narrow and a modest valuation error can move a home across a boundary. Our guide on challenging a mansion tax valuation sets out the process and evidence in detail.

What if my house is just over £2 million?

The £2 million threshold is a cliff edge: a home valued at £2,000,001 owes £2,500 every year, while one valued at £1,999,999 owes nothing. There is no taper. The lowest tier is also the most crowded, with 71,000 of the OBR's 165,000 estimated homes sitting between £2 million and £2.5 million, and the OBR expects buyers to respond by bunching prices just below each boundary. If your home sits near the line, a successful challenge does not shave a bit off the bill, it removes the entire charge, indefinitely. That makes borderline homes the single strongest case for gathering 2026 evidence now: the AVM's estimate only needs to be a few percent too high to cost you £2,500 a year.

Does the mansion tax apply in Scotland or Wales?

No. The High Value Council Tax Surcharge covers England only. Scotland is taking a different route to tax expensive homes: adding new bands I and J to the top of its own council tax scale rather than a separate surcharge. Wales has no equivalent charge; its live debate is over whether to proceed with a full council tax revaluation in 2028. Northern Ireland is untouched too, since it uses domestic rates rather than council tax.

What should owners near £2 million do now?

Because the valuation date is 2026, the evidence that decides a 2027-28 challenge is being created right now. If your home could plausibly be worth £1.5 million or more, start a file:

• Log 2026 sales of comparable homes. Sold prices of similar properties near you, dated 2026, are the core evidence for or against the VOA's estimate. Note addresses, dates, and prices as they happen; Land Registry data lags by months.
• Keep dated records of your home's condition. A desk-based model cannot see subsidence, damp, a dated interior, or a short lease. Photograph problems with timestamps and keep any survey reports from 2026.
• File planning and improvement paperwork. Records of what your home did and did not have in 2026 stop a later valuation silently assuming improvements you never made.
• Check your council tax band too. Most homes near the £2 million mark sit in bands F, G, or H, and an error in the underlying band costs you money every year regardless of what happens to the surcharge.

One honest note on cost: you do not need to pay a surveyor hundreds of pounds today to be ready. The challenge window does not open until the draft list appears in late 2027, and the official challenge routes, both for bands now and for the surcharge as proposed, are free to use. Council Tax Challenger's £9.99 evidence pack covers standard band challenges, not the surcharge: enter your postcode to check your band and your street's bands free, and see whether the band itself is worth challenging while the mansion tax rules are settled.