Six Days to the Budget: Capital Gains Tax Speculation, a Stamp Duty Stand-Still and What Kingston Landlords and Second-Home Owners Should Do Now

Six days. That is how long Kingston landlords and second-home owners have before Chancellor John Healey stands up on 28 October 2026 and delivers an Autumn Budget that could reshape the economics of owning a rental property in England. Nobody outside the Treasury knows exactly what is coming. But the speculation around capital gains tax property Budget 2026 Kingston landlords has reached a level that is already changing behaviour in the local market, with sellers hesitating and buyers waiting for clarity before they commit.

This matters because Kingston upon Thames has a dense mix of buy-to-let flats, family homes let to professionals, and second homes near the river. Any shift in the rules around selling investment property could change the sums for thousands of local owners overnight. This article sets out what is confirmed, what is rumour, and what landlords should do while the picture remains unclear.

Key Takeaways

• No capital gains tax changes have been confirmed. Treasury modelling reportedly includes options to raise rates, but nothing is locked in before 28 October 2026.
• Current CGT on residential property gains remains 18% (basic rate) and 24% (higher/additional rate) after allowances, and this has not changed yet.
• Stamp duty reform is reportedly off the table for this Budget; a single annual property tax has also been ruled out "at this moment in time."
• The High Value Council Tax Surcharge (mansion tax) starts April 2028 for £2 million-plus homes, with the £1.5 million threshold reportedly rejected.
• Rushing to sell a Kingston rental or second home on rumour alone is risky. An accurate RICS valuation protects your tax position whatever the Budget brings.

What Is Actually Being Speculated About CGT

According to a HomeOwners Alliance summary published on 14 October 2026, Treasury officials have reportedly been modelling several options for raising revenue, including bringing capital gains tax closer in line with income tax rates. This would hit landlords and second-home owners hardest, since main residences are largely protected by private residence relief.

It is worth repeating: this is speculation, not policy. The capital gains tax property Budget 2026 Kingston landlords conversation has been fuelled by pre-Budget briefings, not by any published legislation. Rates could stay exactly where they are.

Current rules, unchanged for now:

These figures apply after allowances and only to gains, not to the full sale price.

Stamp Duty: A Stand-Still, Not a Reform

Prime Minister Andy Burnham has reportedly ruled out changing or scrapping stamp duty in this Budget. He has also rejected, for now, replacing stamp duty and council tax with a single annual property tax. For Kingston buyers and sellers hoping for a shake-up, the message is: expect continuity, not reform, on 28 October.

This stand-still is itself useful information. Landlords planning purchases should not delay in the hope of a stamp duty cut that is not currently on the table.

The Mansion Tax Timeline

The already-announced High Value Council Tax Surcharge takes effect from April 2028, applying to homes in England worth £2 million or more. Annual charges will range from £2,500 to £7,500. The Financial Times has reported that Healey has ruled out lowering the threshold to £1.5 million, which would have pulled in more higher-value Kingston properties, particularly in areas like Coombe and the riverside.

For most Kingston landlords with typical buy-to-let flats and terraced houses, this surcharge is unlikely to apply. It matters more for owners of larger detached homes or second homes at the top of the local market.

What the Market Is Doing While Everyone Waits

Uncertainty has a cost. ONS data shows London house prices fell 2.2% in the year to August 2026, with London flats down 5.0% over the same period. Zoopla's Richard Donnell has described buyers taking a clear wait-and-see approach ahead of the Budget, delaying offers until the rules are known.

For landlords, this caution is layered onto an already-changing management landscape. Pegasus Insight's Landlord Trends research, reported on 15 October 2026, found that 66% of rental properties now use a letting agent in some capacity, up from 61% in Q1 2026. Self-managing landlords spend an average of 51 hours a month on their portfolios, compared with just 11 hours for those using full management. Many landlords are clearly reassessing how much time and risk they want to carry, independent of what happens with tax.

Capital Gains Tax Property Budget 2026 Kingston Landlords: Why Valuation Accuracy Matters Now

Whatever the Budget announces, the calculation of any capital gain depends on an accurate base cost. For Kingston property owners, that base cost is typically one of the following:

• The value at 31 March 1982, for long-held properties
• The original acquisition cost plus allowable improvements
• A probate valuation, where property was inherited
• A valuation at the point of a transfer between spouses

A defensible RICS valuation report is the evidence that supports these figures if HMRC ever queries a return. This is true regardless of whether CGT rates rise, stay the same, or fall. Landlords who have owned property for decades, or who inherited a Kingston flat years ago, should not wait for Budget day to establish this figure. Getting it wrong, or relying on an informal estimate, can be costly later.

"Nobody should sell a Kingston rental property purely because of a rumour. The right move is to get the facts straight on valuation, then make a calm decision."

What Kingston Landlords and Second-Home Owners Should Do Now

1. Do not panic-sell. No CGT change is confirmed. Selling in a falling London market to avoid a tax rise that may never happen can lock in a worse outcome than waiting.
2. Get a RICS valuation now. Establish your base cost, whether that is a 1982 value, acquisition cost, or probate figure, before the Budget creates a rush of demand for surveyors.
3. Speak to an accountant, not a headline. Tax planning around a possible rate change is personal and depends on your full financial picture.
4. Review your management set-up. With letting agent use rising and self-management eating up far more time, consider whether your current arrangement still makes sense.
5. Watch the detail, not the speculation. Wait for the actual Budget document on 28 October before making irreversible decisions.
6. Keep records organised. Improvement costs, invoices, and prior valuations all strengthen your position whatever the final CGT rules turn out to be.

FAQ

Has the government confirmed a capital gains tax rise for the 2026 Budget?
No. Reports describe Treasury modelling of options, including aligning CGT more closely with income tax, but nothing has been confirmed ahead of 28 October 2026.

What are the current CGT rates on rental property in the UK?
After allowances, basic-rate taxpayers pay 18% and higher or additional-rate taxpayers pay 24% on residential property gains, under the rules in place now.

Will stamp duty change in this Budget?
Reports suggest the Prime Minister has ruled out changing or scrapping stamp duty in this Budget, and a single annual property tax has also been rejected for now.

Does the mansion tax affect typical Kingston landlords?
The High Value Council Tax Surcharge applies from April 2028 to homes worth £2 million or more. Most standard Kingston rental properties fall well below this threshold.

Why does a RICS valuation matter if CGT rules are uncertain?
Your capital gain is calculated against a base cost, such as a 1982 value or acquisition cost. An accurate, defensible valuation protects you whatever the final tax rules turn out to be.

Is this article tax advice?
No. This is general information only, not tax advice. Always consult a qualified accountant or tax adviser about your specific circumstances before making decisions.

Conclusion

The six days before the Autumn Budget will be full of speculation, but speculation is not policy. Capital gains tax property Budget 2026 Kingston landlords headlines point to possible change, not certain change, and stamp duty appears set for a stand-still rather than reform. The sensible response is not to rush into a sale or a purchase based on rumour, but to prepare properly: secure an accurate RICS valuation for your base cost, talk to an accountant about your personal position, and reassess your property management arrangements in light of current time and cost pressures. Decisions made calmly after 28 October will almost always beat decisions made in a panic before it.

This article is for general information only and does not constitute tax advice. Kingston landlords and second-home owners should consult a qualified accountant regarding their individual circumstances.

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