# UK High Value Council Tax Surcharge implementation > Live situation record from CLSTR: https://clstr.news/situations/uk-high-value-council-tax-surcharge-implementation > Updated: 2026-09-20T06:14:26.000Z. Sources: 10. Developments: 2. The UK government is developing a new property levy known as the High Value Council Tax Surcharge, scheduled to take effect in April 2028. Initially, the plan proposed targeting properties exceeding a £2 million threshold, with annual surcharges estimated between £2,500 and £7,500. To enforce this, HM Revenue and Customs (HMRC) intended to deploy valuation inspectors to private residences, a move that could include criminal penalties for homeowners who obstruct inspections. Following these initial plans, the government began considering lowering the tax threshold to £1.5 million. Such a reduction would significantly expand the number of affected properties, potentially increasing the count from 123,000 to as many as 271,000. London is expected to bear the brunt of this change, with experts suggesting over half of the newly included homes would be in the capital. Chancellor John Healey is expected to address these potential measures during the upcoming Budget on October 28 as the government seeks to stabilize its financial position. ## Timeline ### 2026-09-20: UK government considers lowering mansion tax threshold The UK government may lower the mansion tax threshold to £1.5 million, significantly increasing the number of affected homes and placing a heavy financial burden on London property owners. 5 sources. https://clstr.news/cluster/uk-government-considers-lowering-mansion-tax-threshold ### 2026-08-23: UK government to deploy HMRC inspectors for new mansion tax The UK government plans to send HMRC inspectors into private homes to value properties for a new “mansion tax” targeting homes worth over £2 million, with potential criminal penalties for non-compliance. 5 sources. https://clstr.news/cluster/uk-government-to-deploy-hmrc-inspectors-for-new-mansion-tax --- Cite as: UK High Value Council Tax Surcharge implementation. CLSTR, https://clstr.news/situations/uk-high-value-council-tax-surcharge-implementation