Last updated: October 20, 2026
Eight days. That's how long Notting Hill and Kensington homeowners have before Chancellor John Healey stands up and delivers his first Budget on Wednesday 28 October 2026, a Budget already shadowed by a mansion tax surcharge, speculation about a lower threshold, and a capital gains tax question mark hanging over anyone thinking of selling.
Quick Answer
The Budget 28 October 2026 mansion tax London story centres on a High Value Council Tax Surcharge, confirmed in November 2025, that will apply to English homes worth over £2 million from 2028. Pre-Budget reports suggest the threshold could fall, pulling more west London homes into scope, but this is unconfirmed. Stamp duty will not change in this Budget, council tax band reform has not been ruled out, and capital gains tax on residential sales may rise from the current 18% and 24% rates.
Key Takeaways
- The mansion tax surcharge on £2 million-plus homes was announced in November 2025 and takes effect from 2028.
- Reports ahead of 28 October 2026 suggest a lower threshold is being considered, this is a rumour, not confirmed policy.
- HMRC is already recruiting valuation staff to prepare for the surcharge rollout.
- Stamp duty is explicitly off the table for this Budget, according to the Prime Minister.
- A single annual property tax replacing stamp duty and council tax has been rejected "at this stage."
- Council tax bands, still based on 1991 valuations, remain open to reform.
- Capital gains tax increases on residential property have reportedly been modelled by the Treasury.
- Knight Frank treats 28 October and the Bank of England's 5 November decision as the two dates that will decide whether prime London's recovery holds.
- Rightmove's October 2026 data shows London asking prices at £673,942, down 1.7% year-on-year, with 38% of London listings reduced.
What Is Mansion Tax and When Do I Actually Have to Pay It
The mansion tax is not a new standalone tax, it is a High Value Council Tax Surcharge added on top of existing council tax bills for English homes valued above £2 million. It was announced in the November 2025 Budget and is scheduled to begin in 2028, not immediately.
Homeowners will not receive a bill this year or next. The surcharge sits on top of your normal council tax band charge once your property is assessed above the threshold. HMRC's recruitment of valuation staff signals the groundwork is already underway, even though implementation is two years off.
Common mistake: assuming the surcharge applies from the 2026 Budget date itself. It does not, the 2028 start date was fixed in the prior Budget. What the 28 October 2026 Budget may do is adjust the threshold or add detail, not launch the tax early.
Will the Mansion Tax Threshold Increase in the October 2026 Budget
Reports ahead of the Budget 28 October 2026 mansion tax London announcement suggest the threshold could be lowered, not raised, bringing more properties into scope. This is unconfirmed and should be treated as speculation until the Chancellor's statement.
- The original threshold set in November 2025 was £2 million.
- Pre-Budget reporting has floated a lower figure that would catch more London homes, particularly in boroughs like Kensington and Chelsea.
- No government source has confirmed a specific new figure as of 20 October 2026.
If the threshold does fall, homes currently valued comfortably under £2 million, some period conversions and smaller garden-square houses in Notting Hill, could suddenly fall inside the surcharge band. Owners near any plausible threshold should treat valuation evidence as a priority now, not after the announcement.
How Much Is Mansion Tax on a Property in Notting Hill Right Now
There is no mansion tax bill payable right now. The surcharge does not start until 2028, and the rate structure above £2 million has not been published in detail.
What exists today is the policy commitment and a start date. Notting Hill owners with homes valued near or above £2 million should focus on getting an independent valuation now so they have a defensible, dated figure before any threshold or rate detail is confirmed, not on calculating a bill that cannot yet be calculated.
What's the Difference Between Mansion Tax and Stamp Duty
Mansion tax is an ongoing annual surcharge on owning a high-value home; stamp duty is a one-off tax paid at the point of purchase. They are entirely separate and are being treated differently in this Budget cycle.
| Feature | Mansion tax surcharge | Stamp duty |
|---|---|---|
| When paid | Annually, alongside council tax | Once, at purchase |
| Status in this Budget | Threshold rumoured to change | Explicitly ruled out for change |
| Start date | 2028 | Already in force |
| Based on | Property value above £2m threshold | Purchase price |
The Prime Minister has ruled out scrapping or altering stamp duty in this Budget, and also rejected reports of merging stamp duty and council tax into one annual property tax "at this stage." Buyers completing a purchase around 28 October 2026 should not expect stamp duty rule changes to affect their transaction.
Can You Avoid or Delay Paying Mansion Tax
There is no confirmed mechanism to avoid the surcharge once it applies from 2028, and attempting to artificially understate a property's value is not a sound strategy. The most reliable approach is accurate, evidenced valuation.
- Delaying is not possible once the 2028 rules take effect, it is tied to the property, not the owner's timing.
- Selling before 2028 removes the future liability for that property, but introduces capital gains tax considerations instead.
- A professional Red Book valuation creates a documented, defensible value now, which matters if a future threshold dispute arises.
Edge case: a property valued at £1.9 million today under current market conditions could rise above £2 million by 2028 through normal market movement alone, without any renovation. An independent valuation trail helps demonstrate exactly where a property stood and when.
Mansion Tax vs Council Tax: Which One Do I Owe
Every homeowner already owes council tax; the mansion tax surcharge, once live in 2028, will be owed only by those above the threshold, in addition to existing council tax. They are not alternatives, they stack.
Council tax bands in England are still based on 1991 property values, a point the government has not ruled out reforming. If band reform happens alongside the mansion tax, Notting Hill owners could see two separate changes to their annual property costs rather than one.
How Does Capital Gains Tax Change for Property Sales in 2026
Capital gains tax on residential property gains currently sits at 18% and 24%, and reports suggest the Treasury has modelled possible increases ahead of the 28 October 2026 Budget. No rate change is confirmed yet.
For anyone selling a Notting Hill or Kensington property, this means:
- Current rates (18%/24%) apply until any Budget announcement changes them.
- Sellers close to exchange should keep dated records of purchase price, capital improvements, and professional valuations to support an accurate gains calculation.
- A change announced on 28 October could affect sales that complete after the Budget, depending on the detail, timing of exchange and completion may matter.
Do I Pay Mansion Tax on an Inherited Property
An inherited property above the £2 million threshold would fall within the surcharge once it starts in 2028, in the same way as any other qualifying property. Separately, from April 2027, pensions are being brought into inheritance tax, and reliefs for agricultural and business property are tightening, both relevant to estate planning around high-value homes.
Executors and beneficiaries of high-value west London estates should treat valuation evidence as essential for two separate reasons: inheritance tax calculations now, and potential mansion tax exposure from 2028.
What Are People Getting Wrong About Mansion Tax
The most common error is treating the mansion tax as already in force. It is not, it starts in 2028, and the threshold itself may still change in the 28 October 2026 Budget.
Other frequent misunderstandings:
- Assuming stamp duty is being merged with council tax, the Prime Minister has rejected this "at this stage."
- Assuming all council tax bands will be reformed immediately, reform has not been ruled out, but nothing is confirmed.
- Assuming a self-estimated value is good enough evidence, HMRC's own valuation recruitment suggests disputes are likely near the threshold.
How Long After Buying Do I Have to Pay the Mansion Tax Bill
No mansion tax bill will be issued to any buyer before 2028, regardless of when the purchase completes. Buyers today are not liable for the surcharge at the point of purchase.
What matters for a 2026 buyer is forward planning: if the property is valued near £2 million, or near any lower threshold that might be confirmed on 28 October, the purchase valuation should be documented carefully as a baseline for future reference.
Does Mansion Tax Apply to Buy-to-Let Properties in London
Yes, the surcharge is based on property value, not tenure or use, so a buy-to-let home above the threshold would be liable from 2028 in the same way as an owner-occupied home. Landlords face an additional pressure point: higher income tax rates on rental income apply from April 2027, separate from the mansion tax surcharge.
Landlords with high-value west London lets should factor both changes into cash flow planning, since they land in consecutive years (2027 income tax change, 2028 mansion tax start).
Will Selling My Property Before the Budget Change My Mansion Tax Position
Selling before 2028 removes any future mansion tax liability tied to that property, but it does not avoid capital gains tax, and selling before or after 28 October 2026 will not retroactively change rules that are not yet confirmed. Decisions should be based on genuine market and personal timing, not an attempt to outrun an unconfirmed threshold change.
Rightmove's October 2026 index shows London homes taking 78 days on average to find a buyer, with 38% of listings reduced from their original asking price, a market that already demands realistic, well-evidenced pricing regardless of Budget timing.
What Should Notting Hill Homeowners Do Before 28 October 2026
Homeowners near the £2 million mark, or anyone planning a sale, inheritance transfer, or purchase, should secure an independent RICS Red Book valuation now, before any threshold or rate changes are confirmed. This creates a dated, defensible record that stands independently of whatever is announced.
Checklist before 28 October 2026:
- Commission a RICS Red Book valuation if your property sits within roughly £300,000 of £2 million.
- Keep records of all capital improvements and purchase costs for CGT purposes.
- Review buy-to-let income projections against the April 2027 income tax change.
- Hold off on major irreversible decisions purely in reaction to unconfirmed rumours.
- Speak to a tax adviser alongside a surveyor, valuation and tax treatment are separate disciplines that need to align.
Knight Frank's framing of 28 October and the Bank of England's 5 November decision as the two dates that determine whether prime London's recovery holds is a useful reminder: market direction and policy direction are both still open questions this autumn.
How Can I Plan for Mansion Tax If I'm Buying Soon
Buyers close to exchange on a high-value Notting Hill or Kensington property should get an independent valuation as part of due diligence, not rely solely on the asking price or agent estimate, especially if the property sits near £2 million. This matters more if the threshold changes on 28 October.
- Ask for a Red Book valuation ahead of exchange, particularly on properties between £1.7 million and £2.3 million.
- Factor possible future surcharge costs into long-term affordability, even though the surcharge itself starts in 2028.
- Treat stamp duty costs as fixed under current rules, since change has been ruled out for this Budget.
FAQ
Is the mansion tax confirmed for Notting Hill homes?
The surcharge itself was confirmed in November 2025 for English homes over £2 million from 2028. Notting Hill properties above that value would be included, but any threshold change for the 28 October 2026 Budget remains unconfirmed.
Will stamp duty change on 28 October 2026?
No. The Prime Minister has ruled out scrapping or changing stamp duty in this Budget.
Could council tax bands be reformed?
Reform has not been ruled out. Bands are still based on 1991 valuations, and this remains an open area for the government.
Is capital gains tax definitely rising?
Not confirmed. Reports suggest the Treasury has modelled increases to the current 18% and 24% residential rates, but no decision has been announced.
Does the mansion tax apply immediately after the Budget?
No. The surcharge starts from 2028, regardless of what is announced on 28 October 2026.
Should I get a valuation before the Budget?
Yes, if your property is near £2 million or any plausible lower threshold. An independent Red Book valuation creates evidence that stands regardless of what the Budget confirms.
Conclusion
The Budget 28 October 2026 mansion tax London announcement will not create instant bills or instant certainty, the surcharge itself does not begin until 2028, and several of the most consequential details, including any threshold change, remain rumour rather than policy. What is already fixed is enough to act on: stamp duty stays as it is, rental income tax rises from April 2027, and inheritance tax rules tighten around pensions and reliefs from the same date.
For Notting Hill and Kensington homeowners, the sensible move this week is not to guess at numbers that haven't been announced. It is to get the groundwork right: an independent RICS Red Book valuation for anyone near £2 million, clean records of purchase costs and improvements for capital gains tax purposes, and a conversation with a tax adviser before, not after, 28 October. Contact Notting Hill Surveyors for a Red Book valuation ahead of the Budget.
mansion tax, Budget 2026, council tax reform, capital gains tax UK, Notting Hill property, Kensington homeowners, RICS valuation, Red Book valuation, stamp duty, high value council tax surcharge, prime London property market, John Healey Budget