Zara Bray, mortgage expert at Quilter, has highlighted potential challenges arising from the Autumn Budget’s new annual mansion tax on properties valued over £2 million. She warns that while the number of affected homes is small, the levy could place significant pressure on households whose wealth is tied up in property rather than accessible income.
“The introduction of an annual mansion tax on properties valued above £2 million marks a significant shift in how higher-value homes are taxed. Although the number of affected properties is relatively small, they are heavily concentrated in London and the South East, where prices have long run ahead of local earnings.
The levy relies on property value as a proxy for ability to pay, even though a rising valuation does not guarantee liquidity. Many households in properties above £2 million have seen their home values increase sharply over time without a corresponding rise in income. Treating the property alone as evidence of financial capacity risks placing considerable pressure on those whose wealth is tied up in housing rather than accessible funds.
Regular revaluations add a further layer of uncertainty. As markets move, homeowners may drift into or out of liability from one cycle to the next, increasing the likelihood of disputes and complicating planning. The measure may also influence behaviour at the margins, encouraging people to delay improvements, postpone moves or hold on to properties that no longer suit their needs simply to avoid triggering the levy. This kind of friction at the top end of the market can ripple through chains, reducing mobility more widely.
There has long been a case for reforming council tax, which is still based on 1991 valuations and bears little resemblance to modern property markets. However, a complete overhaul would have required a wholesale revaluation of every home in the country and a significant restructuring of how bills are calculated. That is a vast administrative undertaking with substantial political risk. Instead, the government has opted for a narrower, easier-to-implement mansion tax, but bolting it onto an outdated system risks creating more complexity rather than delivering a coherent long-term solution.”
