The High Value Council Tax Surcharge (HVCTS) — informally and almost universally called the mansion tax — was announced by the Chancellor at the Autumn Budget on 26 November 2025 and takes effect from April 2028. It is an annual charge on residential property valued above £2 million, payable by the property owner.
It is the third significant landlord tax change to be announced in 18 months, sitting alongside the +2 percentage-point property income surcharge from April 2027 and the ongoing fallout from Section 24. For owners of higher-value London and home counties stock — particularly single-family lets and converted period houses — the three combined recalibrate the maths. We work through the full stack in our Autumn Budget 2025 landlord tax stack guide; this piece focuses on HVCTS specifically.
What HVCTS is
HVCTS is an annual surcharge that sits on top of normal council tax. Unlike standard council tax, which falls on the occupier, HVCTS falls on the owner. For landlords, that's the operative word. A landlord with a £3 million London townhouse rented out pays HVCTS themselves — the tenant continues to pay only the underlying council tax band.
HVCTS is structured as a step-function with bands, in the style of SDLT's additional rate or ATED. The Treasury's announcement indicated four bands.
The four indicative bands
Treasury announcements at the Budget set out indicative band structures. Final figures will be confirmed in the implementing regulations; the working numbers as of mid-2026 are:
| Property value | Annual HVCTS surcharge |
|---|---|
| Below £2,000,000 | £0 |
| £2,000,000 – £2,500,000 | £2,500 |
| £2,500,000 – £3,500,000 | £3,500 |
| £3,500,000 – £5,000,000 | £5,000 |
| £5,000,000+ | £7,500 |
These bands have been widely reported by Savills, Travers Smith, Boodle Hatfield and CoStar in their post-Budget commentary, but the exact figures and band cut-offs may shift in the secondary legislation. Treat the table as indicative until the regulations are published.
The valuation reference date
Treasury commentary indicates the reference valuation date is 1 April 2026. That is a static reference point — not annually re-valued. A property that crosses £2m via ordinary price growth after 1 April 2026 escapes HVCTS until the next revaluation cycle, which Treasury commentary suggests will be every five years.
This creates an important practical point for landlords currently holding properties around the £1.8m–£2.2m band: the comp evidence on 1 April 2026 is what matters. A formal RICS valuation as of that date is worth commissioning for any property on the threshold.
Properties most exposed
Four landlord cohorts are most affected:
- Prime central London single-family lets — £3m–£10m houses in W1, SW1, SW3, NW1, NW3, W11. These are the original target of the policy.
- Period houses in the commuter belt — £2m–£3m properties in Buckinghamshire, Surrey, Hertfordshire, Oxfordshire that rent for £6,000–£10,000/month.
- Houses converted to multi-let or HMO that retain a single title — a £2.5m building let as five units to professionals can still be hit by HVCTS on the freehold valuation if it has not been formally split into separate dwellings.
- Boutique serviced-accommodation portfolios — high-end Airbnb-style operations on single high-value houses are not exempt.
Impact on IRR — a worked example
Take a single-family let in Notting Hill bought at £3,000,000, currently rented at £150,000/year (£12,500 pcm). Operating costs of around 22% of gross rent, mortgage at 60% LTV and 5% rate.
- Gross rent: £150,000
- Operating costs (mgmt, voids, repairs, ground services): £33,000
- Mortgage interest: £90,000 (£1.8m × 5%)
- Pre-tax cashflow: £27,000
- Net yield on £3m: 0.9%
Even before HVCTS, that's a thin yield — the prime London single-family-let business has long been a capital growth play, not an income play. Now layer HVCTS at £3,500/yr from April 2028:
- Pre-tax cashflow drops to £23,500
- Net yield drops to 0.78%
- HVCTS as % of net rent: 2.3%
And from April 2027 the property income surcharge adds 2 percentage points to the higher-rate income tax on rental income above £50,000 — compounding the post-tax drag. The combined effect of Section 24 + property income surcharge + HVCTS on a higher-rate London landlord is roughly a 200–300 bps reduction in net IRR over a 10-year hold, versus the pre-2025 regime.
Strategy responses landlords are testing
Conversion into multiple smaller units
Converting a £2.5m freehold house into 4–5 self-contained flats, each independently valued at £450,000–£600,000, removes HVCTS. The conversion capex is material (£200k–£500k depending on scope) but for operators with a 10+ year hold horizon and existing planning consent, the maths can work.
Refinance and partial sale
Some landlords are selling one or two top-end assets to reduce portfolio exposure to HVCTS, recycling proceeds into mid-yield regional stock outside the £2m band. The CGT bill on sale needs careful modelling — a £1m gain at 24% higher-rate CGT (residential property rate) is £240,000, which can wipe out years of post-HVCTS savings.
Hold and absorb
For some prime owners, particularly those holding for capital growth and dynastic reasons, HVCTS is simply a cost-of-doing-business line item. £5,000–£7,500/year on a £5m asset is annoying but not portfolio-breaking. The strategic question is whether the policy precedent — a willingness to tax property by static valuation — opens the door to broader wealth taxation in future budgets.
CGT impact on eventual sale
HVCTS itself doesn't affect CGT on disposal. But the lower headline net yield it produces does affect the capitalisation rate buyers will pay. A 25 bps drop in net yield, capitalised at a typical prime London cap rate of 3–4%, implies a price reduction of roughly 6–8% on the asset. So the IRR drag from HVCTS shows up twice: once in annual cashflow, once in exit value.
Don't structure on the indicative bands. The numbers will likely settle close to the Budget announcement, but the precise thresholds, revaluation cycle, and any reliefs are being legislated through 2026–27. Run scenarios on the indicative figures but rebuild your model when the regulations land.
Frequently asked questions
Is HVCTS the same as the old Annual Tax on Enveloped Dwellings (ATED)?
No. ATED applies to residential property worth over £500,000 held in a corporate or partnership envelope — it's structure-driven. HVCTS applies to any high-value residential property regardless of ownership structure (individual, company, trust, offshore). The two regimes can stack: a £3m London townhouse held in a UK company can be subject to both ATED and HVCTS from April 2028, though the precise interaction is something the implementing regulations will clarify.
Who pays HVCTS if the property is rented out?
The owner, not the tenant. This is the key landlord point. Ordinary council tax falls on the occupier; HVCTS sits on top of council tax but is a property-ownership charge, not a residency charge. A landlord with a £3.5m London family house rented out at £8,000/month pays the surcharge themselves, not the tenant — though many will look to recover it through rent over time.
Will HVCTS be uprated annually?
The Autumn Budget 2025 documents indicate the band thresholds will be subject to periodic revaluation rather than annual CPI indexation, but the precise mechanism isn't yet legislated. Treasury statements suggest a five-year cycle. Until the secondary legislation is published in 2026/27, treat the bands as static for modelling purposes.
Does HVCTS apply to commercial property?
No — residential only. Mixed-use buildings (e.g. shop with flat above) will be apportioned, with HVCTS applying to the residential portion of the valuation if it exceeds the £2m threshold. The implementing regulations will set the apportionment rules; expect them to mirror existing council tax and business rates apportionment practice.
Can I split the title to escape the £2m threshold?
Technically yes if a redevelopment genuinely creates separate self-contained dwellings each independently valued below £2m — but anti-avoidance rules are anticipated. HMRC and Treasury commentary at the Budget pointed at "genuine conversions" being unaffected while "artificial splits" would be caught. The line between the two will be drawn in regulations and case law. Don't structure on the assumption you can paper-split a title.
Is the combination of HVCTS plus the property income surcharge too much for prime London BTL?
For many prime London single-family-let operators, the answer is becoming yes — and several are already reviewing whether to sell, redevelop into smaller units, or shift to higher-yielding asset classes. The combined drag from Section 24, the 2027 property income surcharge (+2 percentage points on rental income above £50k), and HVCTS from 2028 compresses net yields on £3m+ assets to a level where the post-tax return rarely justifies the capital tied up. Run the maths on every prime asset before assuming hold-forever is the right answer.
When was HVCTS announced and when does it take effect?
Announced at the Autumn Budget 2025 (26 November 2025). Effective from April 2028. Secondary legislation setting out the exact bands, valuation methodology, and exemptions is expected in tranches across 2026 and 2027. The reference valuation date is currently understood to be 1 April 2026 — landlords with £1.8m–£2.2m properties should pay attention to comparable evidence as of that date.
Are listed buildings or heritage properties exempt?
No exemption was announced in the Budget. Listed status alone does not appear to be a get-out. The implementing regulations may introduce hardship reliefs (as council tax does for some properties), but heritage status of itself was not flagged as a basis for exemption.