Who Pays the High Value Council Tax Surcharge?

Key takeaways

• The high value council tax surcharge starts in April 2028 at £2,500 a year for homes valued between £2 million and £2.5 million in 2026, rising to £7,500 above £5 million.
• Owners pay it, not occupiers. The OBR's certified costing puts 156,000 English properties in scope in 2028-29 after behaviour, out of 25,944,800 dwellings in England.
• Uprated at 2% a year, ten years of the lowest band costs £27,374 in cash and ten years of the top band costs £82,123.
• The OBR assumes full pass-through into prices at a 5% discount rate, which capitalises the charge at 20 times the annual amount, or £50,000 to £150,000.
• Before it collects anything, the Budget 2025 scorecard has the measure losing £335 million across 2025-26 to 2027-28 through lower stamp duty, capital gains and inheritance tax.

What the high value council tax surcharge bands cost from April 2028

You've probably seen this called a mansion tax. The phrase appears nowhere in the Treasury's consultation, nowhere in the Budget 2025 document and nowhere in the Treasury's own press notice. The question underneath is the same either way. If a home in England is worth £2 million or more, who pays, how much, and from when?

Here's the short answer. From April 2028 the owner of a residential property in England valued at £2 million or more in 2026 pays an annual charge on top of the existing council tax bill. There are 4 bands. The charge runs from £2,500 a year to £7,500, and it's uprated by CPI inflation each year after that. Owners pay, not occupiers, which is the single biggest departure from how council tax works today.

All of it is still a proposal. The high value council tax surcharge consultation ran for 8 weeks from 19 May to 14 July 2026, and the government response hasn't been published. The charging structure below is taken from the Office for Budget Responsibility's certified costing, which is the most precise public statement of the figures.

The ten-year column is arithmetic, not a forecast. It compounds each band's charge at 2% a year for ten years from April 2028, because the OBR's November 2025 forecast has CPI at 2.1% in 2028-29 and 2.0% in each of the two years after. On a £2.2 million home in the bottom band, that's £27,374 of cash over a decade. On a £5.5 million home in the top band, £82,123.

CPI has been running faster than the forecast. The Consumer Prices Index rose 3.1% in the 12 months to August 2026. Push the uprating to 3% and the bottom band's decade costs £28,660 instead, and the top band's £85,979. The difference over ten years is small next to the charge itself, which is the honest finding here: the uprating rate barely matters, and the band you land in matters enormously.

Owners pay it, and 156,000 homes are in scope

Council tax is mostly a charge on occupiers. This one isn't. The consultation is flat about it: "Owners, rather than occupiers, of properties valued as in scope of the HVCTS will be liable to pay the charge." The legal owner carries it, meaning a freeholder or a leaseholder. Joint owners are jointly and severally liable. Where a company owns the property, the company pays.

That matters more than it sounds. If you rent a £2.5 million house, your landlord's bill rises and yours doesn't, at least not directly. Most affected homes are owner-occupied anyway. The Treasury cites a Market Value Survey finding that over 90% of properties worth £2 million or more in 2024 were owner occupied. The rest is where the collection problem sits. The OBR's costing notes that SDLT data shows around 40 per cent of liable properties are not owner-occupied, assumes a tenth of those don't pay, and arrives at a 6 per cent non-payment rate against the 4 per cent currently seen on council tax.

On scale: the OBR's static tax base is 165,000 properties in 2028-29. After its behavioural adjustments, 156,000. Set against 25,944,800 dwellings on the England council tax list at 31 March 2026, that's 0.6% of homes, which is where the government's "fewer than 1%" comes from. The chart below splits those 156,000 by band, and the shape of it is the point. Three quarters of the homes caught sit in the two cheapest bands.

The bands are frozen at 2026 values while the charge rises with CPI

Two numbers move at two different speeds here, and the gap between them is the part most coverage skips.

The charges are indexed. The consultation says properties go into one of 4 bands and that "Charges will be uprated in line with Consumer Price Inflation (CPI) each year." The band boundaries are not indexed, at least not automatically. Revaluations happen every five years, with the next in 2033, and the consultation leaves the rest open: "Decisions on whether to uprate bands will be taken alongside revaluations and will therefore be for a future government."

So between 2028 and 2033 the £2 million line stays a 2026 valuation while the cash charge compounds. The OBR's own house price index runs from 105 in 2026-27 to 117 in 2030-31, a rise of 11.4% over four years. A home valued just under £2 million in the 2026 exercise isn't dragged in by that, because its band is fixed to that exercise. Two things can still move it. New-builds are banded on completion or occupation. And a property that's been significantly improved, "for example by adding a large extension", gets revalued at the sooner of the next revaluation or its sale.

At the 2033 revaluation every property is measured against prices of the day. Whether the £2 million mansion tax threshold moves with them is, on the government's own wording, somebody else's decision.

The capitalised cost is roughly 20 times the annual charge

The annual bill is the figure everyone quotes. It's probably the smaller of the two numbers that matter.

The OBR's costing assumes the charge is fully priced into the homes that carry it. Its method is to take the net present value of the annual charge, "with a discount rate of 5 per cent and assuming the annual charge continues indefinitely", and apply a price capitalisation rate of 100 per cent reached from 2028-29 onwards. A perpetual charge discounted at 5% is worth 20 times the annual amount. That's £50,000 of value against a £2,500 charge, and £150,000 against a £7,500 one.

If the assumption holds, the ten-year cash column understates the hit for anyone who owned a £2 million-plus home when the charge was announced, and overstates it for anyone buying later at a price that already reflects it. The OBR puts numbers on the effect: capitalisation alone takes 3.8% of properties out of scope in 2028-29, and bunching below the band boundaries takes a further 1.5%. The bunching elasticities of 1.0 to 1.25 are borrowed from research on stamp duty notches, adjusted because a recurring charge bites differently from an upfront one.

For anyone who treats a home as part of a balance sheet rather than a place to live, that's a markdown on an asset rather than a bill. It's the same arithmetic that runs through the true cost of owning a home beyond the mortgage, and the reason a running cost and a capital value are two views of one number. Whether you count a house as an investment changes which of the two you look at first.

Who can defer, and what the £35,000 income test actually excludes

Liability follows the asset, not the income, and the government knows that catches some people awkwardly. A deferral scheme is proposed for primary residences only, not second homes and not company-owned property, running until the point of ownership change. A second home may already be carrying a second home council tax premium that doubles its ordinary bill, a charge English councils have been able to levy since April 2025.

The proposed tests are narrow. The consultation puts forward "a household income threshold of £35,000, consistent with thresholds used in the welfare system (for example, Winter Fuel Payments)", alongside capital savings of £16,000 or less, borrowed from pension age Council Tax Support. The first is the same figure as the winter fuel payment threshold, and it carries the same household-versus-individual question. The second is the tighter of the two. A £16,000 savings cap is a low bar for someone sitting in a £3 million house.

Three further details shape it. The equity test copies deferred payment agreements for adult social care, where councils "can allow deferred amounts up to 90% of the value of the asset, minus any existing charges (like a mortgage)". The debt is secured by a charge on the property. And the interest rate isn't settled: the consultation offers the HMRC Official Rate of Interest, "currently 3.75%", the Bank of England base rate as set in April, also 3.75% at the time of writing, or the adult social care rate, "currently 4.75%".

The OBR modelled something different again. Its provisional assumption is that "households with net income under £30,000 per year will be able to use the support scheme", with a 75 per cent take-up among those eligible, producing a 9 per cent cut in revenue. If the final threshold lands on the consultation's £35,000 rather than the costing's £30,000, more households qualify than the £400 million first-year figure assumes.

The surcharge catches more homes than the whole of council tax Band H

England's council tax bands have never been revalued. The Valuation Office's own statistics describe the current register as "the England (1993) and Wales (2005) Council Tax Valuation Lists", and the Treasury's press notice calls it a system "unchanged since 1992". Band H, the top band, covered 155,210 English properties at 31 March 2026. The surcharge's static tax base is 165,000. More homes are in scope for the new charge than sit in the entire top band of the old one.

That gap is the whole case for the measure, and the Treasury makes it with its own comparison. A band D property in Darlington or Blackpool, worth around £400,000 today, pays £2,400 to £2,600 a year. "A mansion in Mayfair valued at £10 million in Band H pays around £2,100." Average band D council tax in England for 2026-27 is £2,392, and the statutory ratio sets band H at 18/9 of band D, so £4,784 on the average bill. Adding £7,500 to a £10 million home therefore charges it more in surcharge than the entire band H bill it pays now. That £4,784 is a 2026-27 figure, and a 4.99% council tax increase in 2027 would add £238.72 to it before the surcharge is counted at all.

Whether that reads as overdue or as a tax on one asset class held by one group is a judgement, not a calculation. The arithmetic only says the old base is a generation out of date and the new one is not.

Where the £430 million and the OBR's £400 million disagree

Two official numbers are in circulation, and they aren't the same one.

The Treasury says the charge "is expected to raise around £430 million per year to support funding for local government services". The Budget 2025 scorecard is more specific and less tidy: -£60m, -£120m, -£155m, then +£400m, +£430m, +£435m across 2025-26 to 2030-31. So £430 million is the 2029-30 number, not the first year's. Year one is £400 million. Both statements are true; one is an average-ish round number and the other is a profile.

The three negative years are the interesting part. Before the surcharge collects anything, announcing it was scored as costing £335 million, because a lower expected price on high-value homes drags down stamp duty, capital gains tax, inheritance tax and the annual tax on enveloped dwellings. Transactions fall too. The OBR assumes "a 1.5 per cent reduction in transaction volumes before valuations are complete due to uncertainty, and a reduction of 1 to 2 per cent baseline transactions in the three years following announcement of the charge due to loss aversion".

There's a second disagreement worth naming. The consultation says the revenue "will support funding for local government services". The OBR says plainly that "the revenues will flow to central government, rather than remain with local government as is the case for standard council tax". Budget 2025 reconciles them: councils collect on behalf of central government, and allocation goes to the 2027 spending review. Against the £50.9 billion the OBR expects council tax to raise in 2025-26, £0.4 billion is less than 1% of what the tax it attaches to already collects.

The strongest objection is the OBR's own uncertainty rating

The best case against treating any of these figures as settled is made inside the costing document. The measure was given a "high" uncertainty rating, with what the OBR calls a very high level of uncertainty over the size of the tax base, and moderate uncertainty around prices, non-compliance, appeals and the support scheme.

Nobody knows how many English homes are worth £2 million, because nobody has valued them. The tax base is assembled from a commercial automated valuation model, reconciled against council tax base statistics and stamp duty transaction data. The Valuation Office's own exercise hasn't happened yet. On top of that, the costing assumes a 20 per cent appeal rate with a 40 per cent success rate, which takes a further 4 per cent off the yield on its own.

The band design invites those appeals by construction. A property valued just under £2.5 million pays £2,500 a year. Just over, £3,500. That £1,000 a year turns on a single valuation judgement about a house nobody has sold, and it repeats every year until the next revaluation. The OBR says as much: the banded design "creates discontinuities in the tax schedule, which is expected to influence buyer behaviour".

The counter-case to the gloomier readings is also in the costing, and it's empirical. Scotland raised rates on its higher bands by up to 22.5 per cent in 2017. HMRC's analysis of that reform "showed no reduction in new property growth rates in bands G and H, and no evidence of properties splitting". The fear that owners would subdivide and developers would stop building at the top end has been tested once, at a smaller magnitude, and it didn't materialise. Collection isn't obviously fragile either: councils already collect 96% of council tax.

What this cannot tell you

It can't tell you your band, because your property hasn't been valued. The Valuation Office is running a targeted exercise combining automated valuation models with professional valuer judgement. Until a banding notice arrives, any figure here is an estimate laid over a guess at your own home's 2026 value, and the band-boundary problem is a real one.

Everything above is consultation design rather than law. The consultation closed on 14 July 2026 and the response hasn't appeared. The exemption list used in the OBR's costing carries its own warning: the government "is consulting on reliefs and exemptions and that this therefore should not be assumed to be the final policy position". Reporting of what a future Budget might change is not a basis for arithmetic, so none of the numbers above come from it.

The ten-year columns project one variable. The OBR's CPI forecast stops at 2030-31, so the 2% used beyond that is an assumption rather than data, and the 3.1% recorded in the year to August 2026 shows how wide the error bar on a decade of uprating really is. The columns also assume the band boundaries hold and the property doesn't change bands, which is the one thing the consultation declines to promise. A sample of one country's banded property tax is not a general law either, which is the limit on the Scottish comparison.

And the geography is narrow. The surcharge applies in England only.

What would change the conclusion

A government response that moves the thresholds. The £2 million line, the four band boundaries and the £2,500 to £7,500 charges all sit in a consultation whose response hasn't been published. Move any of them and every row in the table moves with it.

A deferral test set at £35,000 rather than £30,000. The OBR costed the support scheme at the lower figure and still took 9 per cent off the yield. The consultation proposes the higher one. That gap is the clearest case where the final design, not the headline rate, decides what the measure raises.

Capitalisation that doesn't happen. The 100 per cent pass-through assumption does an enormous amount of work. If prices don't fall, the annual charge is the whole cost and the ten-year columns are the answer. If they fall by the full net present value, most of the cost was borne once, in 2025, by whoever owned the house when the Budget was read. Those are very different pieces of news for the same person, and the evidence to tell them apart comes from £2 million-plus transaction prices between now and 2028, not from the rate.

The thing worth watching isn't the charge. It's the Valuation Office's banding notices, and then the 2033 decision on whether the £2 million line moves at all. One is a number about your house. The other is whether this stays a tax on 156,000 homes or quietly becomes a tax on more of them.